WO2023171688A1

WO2023171688A1 - Compound, organic electroluminescent element material, organic electroluminescent element, and electronic device

Info

Publication number: WO2023171688A1
Application number: PCT/JP2023/008676
Authority: WO
Inventors: 一輝寺田; 圭一安川; 尚人松本
Original assignee: 出光興産株式会社
Priority date: 2022-03-08
Filing date: 2023-03-07
Publication date: 2023-09-14
Also published as: CN118742555A

Abstract

A compound represented by general formula (1), wherein D₁ and D₂ each independently represent a group represented by general formula (11), (12), or (13), at least one of D₁ and D₂ is a group represented by general formula (12) or general formula (13), Rx represents a halogen atom or a substituent group, and Rx is not a substituted or unsubstituted 9-carbazolyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, or a substituted or unsubstituted triazinyl group.

Description

Compounds, materials for organic electroluminescent devices, organic electroluminescent devices and electronic devices

The present invention relates to a compound, a material for an organic electroluminescent device, an organic electroluminescent device, and an electronic device.

When a voltage is applied to an organic electroluminescent element (hereinafter sometimes referred to as an "organic EL element"), holes are injected from the anode into the emissive layer, and electrons are injected from the cathode into the emissive layer. Then, in the light emitting layer, the injected holes and electrons recombine to form excitons. At this time, according to the statistical law of electron spin, singlet excitons are generated at a rate of 25%, and triplet excitons are generated at a rate of 75%.
Fluorescent organic EL devices that use light emission from singlet excitons are being applied to full-color displays such as mobile phones and televisions, but an internal quantum efficiency of 25% is said to be the limit. Therefore, studies are being conducted to improve the performance of organic EL elements.

For example, it is expected that triplet excitons will be used in addition to singlet excitons to cause organic EL devices to emit light more efficiently. Against this background, highly efficient fluorescent organic EL devices using thermally activated delayed fluorescence (hereinafter sometimes simply referred to as "delayed fluorescence") have been proposed and researched.
The TADF (Thermally Activated Delayed Fluorescence) mechanism is the mechanism by which singlet excitons are This mechanism utilizes the thermal phenomenon of reverse intersystem crossing to the term exciton. Thermal activation delayed fluorescence is described, for example, in "Chihaya Adachi, ed., "Device Properties of Organic Semiconductors," Kodansha, published April 1, 2012, pages 261-268."
As a compound exhibiting heat-activated delayed fluorescence (TADF property) (hereinafter also referred to as a TADF compound), for example, a compound in which a donor site and an acceptor site are bonded within the molecule is known.

Documents related to organic EL devices and compounds used in organic EL devices include Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, Patent Document 5, and Patent Document 6.

International Publication No. 2018/237389 International Publication No. 2019/195104 International Publication No. 2019/190235 International Publication No. 2021/066059 International Publication No. 2021/235549 International Publication No. 2019/190235

In order to improve the performance of electronic devices such as displays, there is a demand for further improvement in the performance of organic EL elements. Performance of organic EL elements includes luminous efficiency and lifespan.

An object of the present invention is to provide a compound that can improve at least one of the luminous efficiency and lifetime of an organic EL device, to provide a material for an organic electroluminescent device or an organic electroluminescent device containing the compound, and An object of the present invention is to provide an electronic device equipped with the organic electroluminescent element.

According to one aspect of the present invention, a compound represented by the following general formula (1) is provided.

(In the general formula (1),
D ₁ and D ₂ are each independently a group represented by the following general formula (11), general formula (12) or general formula (13),
However, at least one of D ₁ and D ₂ is a group represented by the following general formula (12) or general formula (13),
Rx is
halogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 5 to 6 carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 14 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 12 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 6 carbon atoms,
a substituted or unsubstituted arylthio group having 6 to 14 ring carbon atoms,
A group represented by the following general formula (12), or a group represented by the following general formula (13),
However, Rx is a substituted or unsubstituted 9-carbazolyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, and a substituted or unsubstituted pyrazinyl group. It is not an unsubstituted triazinyl group. )

(In the general formulas (11) to (13),
Among R ₁ to R ₈ , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R ₁₁ to R ₁₈ , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R ₁₁₁ to R ₁₁₈ , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₁ to R ₈ , R ₁₁ to R ₁₈ and R ₁₁₁ to R ₁₁₈ that do not form a single ring and do not form a fused ring are each independently,
hydrogen atom,
halogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 60 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 30 carbon atoms,
a substituted or unsubstituted arylamino group having 6 to 60 ring carbon atoms,
A substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms,
In the general formula (12) and the general formula (13),
A, B and C are each independently any ring structure selected from the group consisting of ring structures represented by the following general formulas (14), (15), (15A) and (15B),
The ring structure A, the ring structure B and the ring structure C are fused with an adjacent ring structure at any position,
p, px and py are each independently 1, 2, 3 or 4,
When p is 2, 3 or 4, the plurality of ring structures A are the same or different,
When px is 2, 3 or 4, the plurality of ring structures B are the same or different,
When py is 2, 3 or 4, the plurality of ring structures C are the same or different,
However, at least one of D ₁ and D ₂ is
p is 2, 3 or 4, and the ring structure A is a group represented by the above general formula (12) containing a ring structure represented by the following general formula (15A) or (15B), or At least one of px and py is 2, 3, or 4, and the above general formula (13) contains a ring structure represented by the following general formula (15A) or (15B) as ring structure B or ring structure C. ) is a group represented by
* in the general formulas (11) to (13) indicates the bonding position with the benzene ring in the general formula (1). )

(In the general formulas (14) and (15),
The set of R ₁₉ and R ₂₀ is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₁₂₀ and R ₁₉ and R ₂₀ which do not form a single ring and do not form a condensed ring each independently have the same meanings as R ₁ to R ₈ in the general formula (11). )

According to one aspect of the present invention, a compound represented by the following general formula (1A) is provided.

(In the general formula (1A),
D ₃ and D ₄ are each independently a group represented by the following general formula (11), general formula (12) or general formula (13),
However, at least one of D ₃ and D ₄ is a group represented by the following general formula (12) or general formula (13),
Ry is
halogen atom,
a substituted or unsubstituted aryl group having 13 to 30 ring carbon atoms,
a substituted or unsubstituted heteroaryl group having 6 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 5 to 6 carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 14 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 12 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 6 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 14 ring carbon atoms;
A group represented by the following general formula (12) or a group represented by the following general formula (13). )

(In the general formulas (11) to (13),
Among R ₁ to R ₈ , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R ₁₁ to R ₁₈ , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R ₁₁₁ to R ₁₁₈ , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₁ to R ₈ , R ₁₁ to R ₁₈ and R ₁₁₁ to R ₁₁₈ that do not form a single ring and do not form a fused ring are each independently,
hydrogen atom,
halogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 60 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 30 carbon atoms,
a substituted or unsubstituted arylamino group having 6 to 60 ring carbon atoms,
A substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms,
However, R ₁ to R ₈ , R ₁₁ to R ₁₈ and R ₁₁₁ to R ₁₁₈ are not unsubstituted biphenyl groups and are not substituted or unsubstituted dibenzofuranyl groups,
In the general formula (12) and the general formula (13),
A, B and C are each independently any ring structure selected from the group consisting of ring structures represented by the following general formulas (14), (15), (15A) and (15B),
The ring structure A, the ring structure B and the ring structure C are fused with an adjacent ring structure at any position,
p, px and py are each independently 1, 2, 3 or 4,
When p is 2, 3 or 4, the plurality of ring structures A are the same or different,
When px is 2, 3 or 4, the plurality of ring structures B are the same or different,
When py is 2, 3 or 4, the plurality of ring structures C are the same or different,
* in the general formulas (11) to (13) indicates the bonding position with the benzene ring in the general formula (1A). )

According to one aspect of the present invention, an organic electroluminescent device material containing the compound according to the above-described one aspect of the present invention is provided.

According to one aspect of the present invention, an organic electroluminescent element has an anode, a cathode, and an organic layer, the organic layer containing the compound according to the above-described one aspect of the present invention as a first compound. is provided.

According to one aspect of the present invention, there is provided an electronic device equipped with the organic electroluminescent element according to the above-described one aspect of the present invention.

According to one aspect of the present invention, there is provided a compound that can improve at least one of the luminous efficiency and lifetime of an organic EL device, and an organic electroluminescent device material or an organic electroluminescent device containing the compound. Furthermore, it is possible to provide an electronic device equipped with the organic electroluminescent element.

FIG. 2 is a schematic diagram of an apparatus for measuring transient PL. It is a figure which shows an example of the attenuation curve of transient PL. It is a figure which shows the schematic structure of an example of the organic electroluminescent element based on 4th embodiment of this invention. It is a figure which shows the energy level of the 1st compound and the 2nd compound in the light emitting layer of an example of the organic electroluminescent element based on 4th embodiment of this invention, and the relationship of energy transfer. It is a figure which shows the energy level of the 1st compound, the 2nd compound, and the 3rd compound in the light emitting layer of an example of the organic electroluminescent element based on 5th embodiment of this invention, and the relationship of energy transfer. It is a figure which shows the energy level of the 1st compound and the 3rd compound in the light emitting layer of an example of the organic electroluminescent element based on 6th embodiment of this invention, and the relationship of energy transfer.

[Definition]
In this specification, the hydrogen atom includes isotopes having different numbers of neutrons, ie, light hydrogen (protium), deuterium (deuterium), and tritium (tritium).

In this specification, in a chemical structural formula, a hydrogen atom, that is, a light hydrogen atom, a deuterium atom, or Assume that tritium atoms are bonded.

In this specification, the number of carbon atoms forming a ring refers to the number of carbon atoms constituting the ring itself of a compound having a structure in which atoms are bonded in a cyclic manner (for example, a monocyclic compound, a condensed ring compound, a bridged compound, a carbocyclic compound, and a heterocyclic compound). represents the number of carbon atoms among the atoms. When the ring is substituted with a substituent, the carbon contained in the substituent is not included in the number of carbon atoms forming the ring. The "number of ring carbon atoms" described below is the same unless otherwise specified. For example, a benzene ring has 6 carbon atoms, a naphthalene ring has 10 carbon atoms, a pyridine ring has 5 carbon atoms, and a furan ring has 4 carbon atoms. Further, for example, the number of ring carbon atoms in the 9,9-diphenylfluorenyl group is 13, and the number of ring carbon atoms in the 9,9'-spirobifluorenyl group is 25.
Further, when the benzene ring is substituted with an alkyl group as a substituent, for example, the number of carbon atoms of the alkyl group is not included in the number of carbon atoms forming the benzene ring. Therefore, the number of ring carbon atoms in the benzene ring substituted with an alkyl group is 6. Further, when the naphthalene ring is substituted with an alkyl group as a substituent, for example, the number of carbon atoms of the alkyl group is not included in the number of carbon atoms forming the naphthalene ring. Therefore, the number of ring carbon atoms in the naphthalene ring substituted with an alkyl group is 10.

In this specification, the number of ring-forming atoms refers to compounds with a structure in which atoms are bonded in a cyclic manner (e.g., monocyclic, fused ring, and ring assembly) (e.g., monocyclic compound, fused ring compound, bridged compound, carbocyclic compound). Represents the number of atoms that constitute the ring itself (compounds and heterocyclic compounds). Atoms that do not form a ring (for example, a hydrogen atom that terminates a bond between atoms that form a ring) and atoms that are included in a substituent when the ring is substituted with a substituent are not included in the number of ring-forming atoms. The "number of ring-forming atoms" described below is the same unless otherwise specified. For example, the number of ring atoms in the pyridine ring is 6, the number of ring atoms in the quinazoline ring is 10, and the number of ring atoms in the furan ring is 5. For example, the number of hydrogen atoms bonded to the pyridine ring or atoms constituting substituents is not included in the number of atoms forming the pyridine ring. Therefore, the number of ring atoms of the pyridine ring to which hydrogen atoms or substituents are bonded is six. Furthermore, for example, hydrogen atoms bonded to carbon atoms of the quinazoline ring or atoms constituting substituents are not included in the number of ring-forming atoms of the quinazoline ring. Therefore, the number of ring atoms in the quinazoline ring to which hydrogen atoms or substituents are bonded is 10.

In the present specification, "carbon number XX to YY" in the expression "substituted or unsubstituted ZZ group with carbon number XX to YY" represents the number of carbon atoms when the ZZ group is unsubstituted, and is substituted. Do not include the number of carbon atoms in substituents. Here, "YY" is larger than "XX", "XX" means an integer of 1 or more, and "YY" means an integer of 2 or more.

In this specification, "number of atoms XX to YY" in the expression "substituted or unsubstituted ZZ group with number of atoms XX to YY" represents the number of atoms when the ZZ group is unsubstituted, and is substituted. Do not include the number of atoms of substituents in case. Here, "YY" is larger than "XX", "XX" means an integer of 1 or more, and "YY" means an integer of 2 or more.

In this specification, an unsubstituted ZZ group refers to a case where a "substituted or unsubstituted ZZ group" is an "unsubstituted ZZ group", and a substituted ZZ group refers to a "substituted or unsubstituted ZZ group". represents the case where is a "substituted ZZ group".
In the present specification, "unsubstituted" in the case of "substituted or unsubstituted ZZ group" means that the hydrogen atom in the ZZ group is not replaced with a substituent. The hydrogen atom in the "unsubstituted ZZ group" is a light hydrogen atom, a deuterium atom, or a tritium atom.
Furthermore, in this specification, "substituted" in the case of "substituted or unsubstituted ZZ group" means that one or more hydrogen atoms in the ZZ group are replaced with a substituent. "Substitution" in the case of "BB group substituted with an AA group" similarly means that one or more hydrogen atoms in the BB group are replaced with an AA group.

"Substituents described herein"
The substituents described in this specification will be explained below.

The number of ring carbon atoms in the "unsubstituted aryl group" described herein is 6 to 50, preferably 6 to 30, more preferably 6 to 18, unless otherwise specified herein. .
The number of ring atoms of the "unsubstituted heterocyclic group" described herein is 5 to 50, preferably 5 to 30, more preferably 5 to 18, unless otherwise specified herein. be.
The number of carbon atoms in the "unsubstituted alkyl group" described herein is 1 to 50, preferably 1 to 20, more preferably 1 to 6, unless otherwise specified herein.
The number of carbon atoms in the "unsubstituted alkenyl group" described herein is 2 to 50, preferably 2 to 20, more preferably 2 to 6, unless otherwise specified herein.
The number of carbon atoms in the "unsubstituted alkynyl group" described herein is 2 to 50, preferably 2 to 20, more preferably 2 to 6, unless otherwise specified herein.
Unless otherwise specified herein, the number of ring carbon atoms in the "unsubstituted cycloalkyl group" described herein is 3 to 50, preferably 3 to 20, more preferably 3 to 6. be.
Unless otherwise specified herein, the number of ring carbon atoms in the "unsubstituted arylene group" described herein is 6 to 50, preferably 6 to 30, more preferably 6 to 18. .
The number of ring atoms of the "unsubstituted divalent heterocyclic group" described herein is 5 to 50, preferably 5 to 30, more preferably 5 unless otherwise specified herein. ~18.
The number of carbon atoms in the "unsubstituted alkylene group" described herein is 1 to 50, preferably 1 to 20, more preferably 1 to 6, unless otherwise specified herein.

・“Substituted or unsubstituted aryl group”
Specific examples (specific example group G1) of the "substituted or unsubstituted aryl group" described in this specification include the following unsubstituted aryl groups (specific example group G1A) and substituted aryl groups (specific example group G1B). ) etc. (Here, the unsubstituted aryl group refers to the case where the "substituted or unsubstituted aryl group" is an "unsubstituted aryl group", and the substituted aryl group refers to the case where the "substituted or unsubstituted aryl group" is (Refers to the case where it is a "substituted aryl group.") In this specification, the mere mention of "aryl group" includes both "unsubstituted aryl group" and "substituted aryl group."
"Substituted aryl group" means a group in which one or more hydrogen atoms of "unsubstituted aryl group" are replaced with a substituent. Examples of the "substituted aryl group" include a group in which one or more hydrogen atoms of the "unsubstituted aryl group" in the specific example group G1A below are replaced with a substituent, and a substituted aryl group in the following specific example group G1B. Examples include: The examples of "unsubstituted aryl group" and "substituted aryl group" listed here are just examples, and the "substituted aryl group" described in this specification includes the following specific examples. A group in which the hydrogen atom bonded to the carbon atom of the aryl group itself in the "substituted aryl group" of Group G1B is further replaced with a substituent, and a hydrogen atom of the substituent in the "substituted aryl group" in the following specific example group G1B is Furthermore, groups substituted with substituents are also included.

・Unsubstituted aryl group (specific example group G1A):
phenyl group,
p-biphenyl group,
m-biphenyl group,
o-biphenyl group,
p-terphenyl-4-yl group,
p-terphenyl-3-yl group,
p-terphenyl-2-yl group,
m-terphenyl-4-yl group,
m-terphenyl-3-yl group,
m-terphenyl-2-yl group,
o-terphenyl-4-yl group,
o-terphenyl-3-yl group,
o-terphenyl-2-yl group,
1-naphthyl group,
2-naphthyl group,
anthryl group,
benzanthryl group,
phenanthryl group,
benzophenanthryl group,
phenalenyl group,
pyrenyl group,
chrysenyl group,
benzocrysenyl group,
triphenylenyl group,
benzotriphenylenyl group,
tetracenyl group,
pentacenyl group,
fluorenyl group,
9,9'-spirobifluorenyl group,
benzofluorenyl group,
dibenzofluorenyl group,
fluoranthenyl group,
benzofluoranthenyl group,
A monovalent aryl group derived by removing one hydrogen atom from a perylenyl group and a ring structure represented by the following general formulas (TEMP-1) to (TEMP-15).

・Substituted aryl group (specific example group G1B):
o-tolyl group,
m-tolyl group,
p-tolyl group,
para-xylyl group,
meta-xylyl group,
ortho-xylyl group,
para-isopropylphenyl group,
meta-isopropylphenyl group,
ortho-isopropylphenyl group,
para-t-butylphenyl group,
meta-t-butylphenyl group,
ortho-t-butylphenyl group,
3,4,5-trimethylphenyl group,
9,9-dimethylfluorenyl group,
9,9-diphenylfluorenyl group,
9,9-bis(4-methylphenyl)fluorenyl group,
9,9-bis(4-isopropylphenyl)fluorenyl group,
9,9-bis(4-t-butylphenyl)fluorenyl group,
cyanophenyl group,
triphenylsilylphenyl group,
trimethylsilylphenyl group,
phenylnaphthyl group,
A group in which one or more hydrogen atoms of a monovalent group derived from a naphthylphenyl group and a ring structure represented by the above general formulas (TEMP-1) to (TEMP-15) are replaced with a substituent.

・“Substituted or unsubstituted heterocyclic group”
The "heterocyclic group" described herein is a cyclic group containing at least one heteroatom as a ring-forming atom. Specific examples of heteroatoms include nitrogen atom, oxygen atom, sulfur atom, silicon atom, phosphorus atom, and boron atom.
A "heterocyclic group" as described herein is a monocyclic group or a fused ring group.
A "heterocyclic group" as described herein is an aromatic heterocyclic group or a non-aromatic heterocyclic group.
Specific examples of the "substituted or unsubstituted heterocyclic group" (specific example group G2) described in this specification include the following unsubstituted heterocyclic group (specific example group G2A) and substituted heterocyclic group ( Examples include specific example group G2B). (Here, the term "unsubstituted heterocyclic group" refers to the case where "substituted or unsubstituted heterocyclic group" is "unsubstituted heterocyclic group", and the term "substituted heterocyclic group" refers to "substituted or unsubstituted heterocyclic group"). "Heterocyclic group" refers to a "substituted heterocyclic group.") In this specification, simply "heterocyclic group" refers to "unsubstituted heterocyclic group" and "substituted heterocyclic group." including both.
"Substituted heterocyclic group" means a group in which one or more hydrogen atoms of "unsubstituted heterocyclic group" are replaced with a substituent. Specific examples of the "substituted heterocyclic group" include a group in which the hydrogen atom of the "unsubstituted heterocyclic group" in specific example group G2A is replaced, and examples of substituted heterocyclic groups in specific example group G2B below. Can be mentioned. The examples of "unsubstituted heterocyclic group" and "substituted heterocyclic group" listed here are just examples, and the "substituted heterocyclic group" described in this specification includes specific A group in which the hydrogen atom bonded to the ring-forming atom of the heterocyclic group itself in the "substituted heterocyclic group" in example group G2B is further replaced with a substituent, and a substituent in the "substituted heterocyclic group" in specific example group G2B Also included are groups in which a hydrogen atom is further replaced with a substituent.

Specific example group G2A includes, for example, the following unsubstituted heterocyclic groups containing a nitrogen atom (specific example group G2A1), unsubstituted heterocyclic groups containing an oxygen atom (specific example group G2A2), and unsubstituted heterocyclic groups containing a sulfur atom. heterocyclic group (specific example group G2A3), and a monovalent heterocyclic group derived by removing one hydrogen atom from the ring structure represented by the following general formulas (TEMP-16) to (TEMP-33) (Specific example group G2A4).

Specific example group G2B includes, for example, the following substituted heterocyclic groups containing a nitrogen atom (specific example group G2B1), substituted heterocyclic groups containing an oxygen atom (specific example group G2B2), and substituted heterocyclic groups containing a sulfur atom. group (Specific Example Group G2B3), and one or more hydrogen atoms of a monovalent heterocyclic group derived from a ring structure represented by the following general formulas (TEMP-16) to (TEMP-33) are substituents. Includes substituted groups (Example Group G2B4).

・Unsubstituted heterocyclic group containing a nitrogen atom (specific example group G2A1):
pyrrolyl group,
imidazolyl group,
pyrazolyl group,
triazolyl group,
Tetrazolyl group,
oxazolyl group,
isoxazolyl group,
oxadiazolyl group,
thiazolyl group,
isothiazolyl group,
thiadiazolyl group,
pyridyl group,
pyridazinyl group,
pyrimidinyl group,
pyrazinyl group,
triazinyl group,
indolyl group,
isoindolyl group,
indolizinyl group,
quinolidinyl group,
quinolyl group,
isoquinolyl group,
cinnolyl group,
phthalazinyl group,
quinazolinyl group,
quinoxalinyl group,
benzimidazolyl group,
indazolyl group,
phenanthrolinyl group,
phenanthridinyl group,
acridinyl group,
phenazinyl group,
carbazolyl group,
benzocarbazolyl group,
morpholino group,
phenoxazinyl group,
phenothiazinyl group,
Azacarbazolyl group and diazacarbazolyl group.

・Unsubstituted heterocyclic group containing an oxygen atom (specific example group G2A2):
frill group,
oxazolyl group,
isoxazolyl group,
oxadiazolyl group,
xanthenyl group,
benzofuranyl group,
isobenzofuranyl group,
dibenzofuranyl group,
naphthobenzofuranyl group,
benzoxazolyl group,
benzisoxazolyl group,
phenoxazinyl group,
morpholino group,
dinaphthofuranyl group,
azadibenzofuranyl group,
diazadibenzofuranyl group,
Azanaphthobenzofuranyl group, and diazanaphthobenzofuranyl group.

・Unsubstituted heterocyclic group containing a sulfur atom (specific example group G2A3):
thienyl group,
thiazolyl group,
isothiazolyl group,
thiadiazolyl group,
benzothiophenyl group (benzothienyl group),
Isobenzothiophenyl group (isobenzothienyl group),
dibenzothiophenyl group (dibenzothienyl group),
naphthobenzothiophenyl group (naphthobenzothienyl group),
benzothiazolyl group,
benzisothiazolyl group,
phenothiazinyl group,
dinaphthothiophenyl group (dinaphthothienyl group),
Azadibenzothiophenyl group (azadibenzothienyl group),
Diazadibenzothiophenyl group (diazadibenzothienyl group),
Azanaphthobenzothiophenyl group (azanaphthobenzothienyl group), and diazanaphthobenzothiophenyl group (diazanaphthobenzothienyl group).

- Monovalent heterocyclic groups derived by removing one hydrogen atom from the ring structures represented by the following general formulas (TEMP-16) to (TEMP-33) (specific example group G2A4):

In the general formulas (TEMP-16) to (TEMP-33), X _A and Y _A are each independently an oxygen atom, a sulfur atom, NH, or CH ₂ . However, at least one of X _A and Y _A is an oxygen atom, a sulfur atom, or NH.
In the general formulas (TEMP-16) to (TEMP-33), when at least one of X _A and Y _A is NH or CH ₂ , in the general formulas (TEMP-16) to (TEMP-33), The monovalent heterocyclic group derived from the represented ring structure includes a monovalent group obtained by removing one hydrogen atom from these NH or CH ₂ .

・Substituted heterocyclic group containing a nitrogen atom (specific example group G2B1):
(9-phenyl)carbazolyl group,
(9-biphenylyl)carbazolyl group,
(9-phenyl)phenylcarbazolyl group,
(9-naphthyl)carbazolyl group,
diphenylcarbazol-9-yl group,
phenylcarbazol-9-yl group,
methylbenzimidazolyl group,
ethylbenzimidazolyl group,
phenyltriazinyl group,
biphenylyltriazinyl group,
diphenyltriazinyl group,
phenylquinazolinyl group, and biphenylylquinazolinyl group.

・Substituted heterocyclic group containing an oxygen atom (specific example group G2B2):
phenyldibenzofuranyl group, methyldibenzofuranyl group,
A t-butyldibenzofuranyl group and a monovalent residue of spiro[9H-xanthene-9,9'-[9H]fluorene].

・Substituted heterocyclic group containing a sulfur atom (specific example group G2B3):
phenyldibenzothiophenyl group,
methyldibenzothiophenyl group,
A t-butyldibenzothiophenyl group and a monovalent residue of spiro[9H-thioxanthene-9,9'-[9H]fluorene].

- A group in which one or more hydrogen atoms of a monovalent heterocyclic group derived from the ring structure represented by the general formulas (TEMP-16) to (TEMP-33) is replaced with a substituent (specific example group G2B4) ):

The above-mentioned "one or more hydrogen atoms of a monovalent heterocyclic group" refers to a hydrogen atom bonded to a ring-forming carbon atom of the monovalent heterocyclic group, and at least one of XA and YA is NH. It means one or more hydrogen atoms selected from the hydrogen atom bonded to the nitrogen atom in the case where XA and YA are CH2, and the hydrogen atom of the methylene group when one of XA and YA is CH2.

・“Substituted or unsubstituted alkyl group”
Specific examples (specific example group G3) of the "substituted or unsubstituted alkyl group" described in this specification include the following unsubstituted alkyl groups (specific example group G3A) and substituted alkyl groups (specific example group G3B). ). (Here, an unsubstituted alkyl group refers to a case where a "substituted or unsubstituted alkyl group" is an "unsubstituted alkyl group," and a substituted alkyl group refers to a case where a "substituted or unsubstituted alkyl group" is (This refers to the case where it is a "substituted alkyl group.") Hereinafter, when it is simply referred to as an "alkyl group," it includes both an "unsubstituted alkyl group" and a "substituted alkyl group."
"Substituted alkyl group" means a group in which one or more hydrogen atoms in "unsubstituted alkyl group" are replaced with a substituent. Specific examples of the "substituted alkyl group" include groups in which one or more hydrogen atoms in the "unsubstituted alkyl group" (specific example group G3A) below are replaced with a substituent, and substituted alkyl groups (specific examples Examples include group G3B). In this specification, the alkyl group in "unsubstituted alkyl group" means a chain alkyl group. Therefore, the "unsubstituted alkyl group" includes a linear "unsubstituted alkyl group" and a branched "unsubstituted alkyl group". The examples of "unsubstituted alkyl group" and "substituted alkyl group" listed here are just examples, and the "substituted alkyl group" described in this specification includes specific example group G3B. A group in which the hydrogen atom of the alkyl group itself in the "substituted alkyl group" in "Substituted alkyl group" is further replaced with a substituent, and a group in which the hydrogen atom of the substituent in the "substituted alkyl group" in Example Group G3B is further replaced with a substituent. included.

・Unsubstituted alkyl group (specific example group G3A):
methyl group,
ethyl group,
n-propyl group,
isopropyl group,
n-butyl group,
isobutyl group,
s-butyl group and t-butyl group.

・Substituted alkyl group (specific example group G3B):
Heptafluoropropyl group (including isomers), pentafluoroethyl group,
2,2,2-trifluoroethyl group and trifluoromethyl group.

・“Substituted or unsubstituted alkenyl group”
Specific examples of the "substituted or unsubstituted alkenyl group" (specific example group G4) described in this specification include the following unsubstituted alkenyl groups (specific example group G4A) and substituted alkenyl groups (specific example group G4B), etc. (Here, the term "unsubstituted alkenyl group" refers to the case where "substituted or unsubstituted alkenyl group" is "unsubstituted alkenyl group", and "substituted alkenyl group" refers to "substituted or unsubstituted alkenyl group"). " refers to the case where it is a "substituted alkenyl group.") In the present specification, simply "alkenyl group" includes both "unsubstituted alkenyl group" and "substituted alkenyl group."
"Substituted alkenyl group" means a group in which one or more hydrogen atoms in "unsubstituted alkenyl group" are replaced with a substituent. Specific examples of the "substituted alkenyl group" include the following "unsubstituted alkenyl group" (specific example group G4A) having a substituent, and the substituted alkenyl group (specific example group G4B). It will be done. The examples of "unsubstituted alkenyl group" and "substituted alkenyl group" listed here are just examples, and the "substituted alkenyl group" described in this specification includes specific example group G4B. A group in which the hydrogen atom of the alkenyl group itself in the "substituted alkenyl group" is further replaced with a substituent, and a group in which the hydrogen atom of the substituent in the "substituted alkenyl group" in Example Group G4B is further replaced with a substituent. included.

・Unsubstituted alkenyl group (specific example group G4A):
vinyl group,
allyl group,
1-butenyl group,
2-butenyl group and 3-butenyl group.

・Substituted alkenyl group (specific example group G4B):
1,3-butandienyl group,
1-methylvinyl group,
1-methylallyl group,
1,1-dimethylallyl group,
2-methylallyl group and 1,2-dimethylallyl group.

・“Substituted or unsubstituted alkynyl group”
Specific examples of the "substituted or unsubstituted alkynyl group" (specific example group G5) described in this specification include the following unsubstituted alkynyl group (specific example group G5A). (Here, the term "unsubstituted alkynyl group" refers to the case where "substituted or unsubstituted alkynyl group" is "unsubstituted alkynyl group.") Hereinafter, when simply "alkynyl group" is used, "unsubstituted alkynyl group" is referred to as "unsubstituted alkynyl group." ``alkynyl group'' and ``substituted alkynyl group.''
"Substituted alkynyl group" means a group in which one or more hydrogen atoms in "unsubstituted alkynyl group" are replaced with a substituent. Specific examples of the "substituted alkynyl group" include groups in which one or more hydrogen atoms in the following "unsubstituted alkynyl group" (specific example group G5A) are replaced with a substituent.

・Unsubstituted alkynyl group (specific example group G5A):
Ethynyl group.

・“Substituted or unsubstituted cycloalkyl group”
Specific examples (specific example group G6) of the "substituted or unsubstituted cycloalkyl group" described in this specification include the following unsubstituted cycloalkyl groups (specific example group G6A) and substituted cycloalkyl groups ( Examples include specific example group G6B). (Here, the term "unsubstituted cycloalkyl group" refers to the case where "substituted or unsubstituted cycloalkyl group" is "unsubstituted cycloalkyl group", and the term "substituted cycloalkyl group" refers to "substituted or unsubstituted cycloalkyl group"). ("cycloalkyl group" refers to the case where "substituted cycloalkyl group" is used.) In this specification, when simply referring to "cycloalkyl group", it refers to "unsubstituted cycloalkyl group" and "substituted cycloalkyl group". including both.
"Substituted cycloalkyl group" means a group in which one or more hydrogen atoms in "unsubstituted cycloalkyl group" are replaced with a substituent. Specific examples of the "substituted cycloalkyl group" include the following "unsubstituted cycloalkyl group" (specific example group G6A) in which one or more hydrogen atoms are replaced with a substituent, and a substituted cycloalkyl group. (Specific example group G6B) and the like can be mentioned. The examples of "unsubstituted cycloalkyl group" and "substituted cycloalkyl group" listed here are just examples, and the "substituted cycloalkyl group" described in this specification includes specific A group in which one or more hydrogen atoms bonded to the carbon atom of the cycloalkyl group itself is replaced with a substituent in the "substituted cycloalkyl group" of example group G6B, and in the "substituted cycloalkyl group" of specific example group G6B Also included are groups in which the hydrogen atom of a substituent is further replaced with a substituent.

・Unsubstituted cycloalkyl group (specific example group G6A):
cyclopropyl group,
cyclobutyl group,
cyclopentyl group,
cyclohexyl group,
1-adamantyl group,
2-adamantyl group,
1-norbornyl group and 2-norbornyl group.

- Substituted cycloalkyl group (specific example group G6B): 4-methylcyclohexyl group.

・"Group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ )"
Specific examples of the group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ) described in this specification (specific example group G7) include:
-Si(G1)(G1)(G1),
-Si (G1) (G2) (G2),
-Si (G1) (G1) (G2),
-Si(G2)(G2)(G2),
-Si(G3)(G3)(G3), and -Si(G6)(G6)(G6). here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.
- A plurality of G1's in Si(G1) (G1) (G1) are the same or different from each other.
- A plurality of G2's in Si(G1)(G2)(G2) are mutually the same or different.
- A plurality of G1's in Si(G1) (G1) (G2) are mutually the same or different.
- A plurality of G2's in Si(G2) (G2) (G2) are mutually the same or different.
- A plurality of G3's in Si(G3) (G3) (G3) are mutually the same or different.
- A plurality of G6's in Si(G6) (G6) (G6) are mutually the same or different.

・"Group represented by -O-(R ₉₀₄ )"
Specific examples of the group represented by -O-(R ₉₀₄ ) described in this specification (specific example group G8) include:
-O(G1),
-O(G2),
-O(G3) and -O(G6) are mentioned.
here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.

・"Group represented by -S-(R ₉₀₅ )"
Specific examples of the group represented by -S-(R ₉₀₅ ) described in this specification (specific example group G9) include:
-S (G1),
-S (G2),
-S (G3) and -S (G6).
here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.

・"Group represented by -N(R ₉₀₆ )(R ₉₀₇ )"
Specific examples of the group represented by -N(R ₉₀₆ )(R ₉₀₇ ) described in this specification (specific example group G10) include:
-N(G1)(G1),
-N(G2)(G2),
-N (G1) (G2),
-N(G3) (G3), and -N(G6) (G6).
here,
G1 is a "substituted or unsubstituted aryl group" described in specific example group G1.
G2 is a "substituted or unsubstituted heterocyclic group" described in specific example group G2.
G3 is a "substituted or unsubstituted alkyl group" described in specific example group G3.
G6 is a "substituted or unsubstituted cycloalkyl group" described in specific example group G6.
-N(G1) A plurality of G1's in (G1) are mutually the same or different.
-N(G2) A plurality of G2's in (G2) are the same or different.
-N(G3) A plurality of G3's in (G3) are mutually the same or different.
-N(G6) Multiple G6s in (G6) are the same or different from each other

・"Halogen atom"
Specific examples of the "halogen atom" (specific example group G11) described in this specification include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, and the like.

・“Substituted or unsubstituted fluoroalkyl group”
The "substituted or unsubstituted fluoroalkyl group" described in this specification refers to a "substituted or unsubstituted alkyl group" in which at least one hydrogen atom bonded to a carbon atom constituting the alkyl group is replaced with a fluorine atom. It also includes a group in which all hydrogen atoms bonded to the carbon atoms constituting the alkyl group in a "substituted or unsubstituted alkyl group" are replaced with fluorine atoms (perfluoro group). The number of carbon atoms in the "unsubstituted fluoroalkyl group" is from 1 to 50, preferably from 1 to 30, and more preferably from 1 to 18, unless otherwise specified herein. "Substituted fluoroalkyl group" means a group in which one or more hydrogen atoms of the "fluoroalkyl group" are replaced with a substituent. In addition, the "substituted fluoroalkyl group" described in this specification includes a group in which one or more hydrogen atoms bonded to the carbon atom of the alkyl chain in the "substituted fluoroalkyl group" is further replaced with a substituent, and Also included are groups in which one or more hydrogen atoms of a substituent in a "substituted fluoroalkyl group" are further replaced with a substituent. Specific examples of the "unsubstituted fluoroalkyl group" include a group in which one or more hydrogen atoms in the "alkyl group" (specific example group G3) are replaced with a fluorine atom.

・“Substituted or unsubstituted haloalkyl group”
The "substituted or unsubstituted haloalkyl group" described herein means that at least one hydrogen atom bonded to a carbon atom constituting the alkyl group in the "substituted or unsubstituted alkyl group" is replaced with a halogen atom. It means a group, and also includes a group in which all hydrogen atoms bonded to carbon atoms constituting an alkyl group in a "substituted or unsubstituted alkyl group" are replaced with halogen atoms. Unless otherwise specified herein, the number of carbon atoms in the "unsubstituted haloalkyl group" is from 1 to 50, preferably from 1 to 30, and more preferably from 1 to 18. "Substituted haloalkyl group" means a group in which one or more hydrogen atoms of the "haloalkyl group" are replaced with a substituent. In addition, the "substituted haloalkyl group" described in this specification includes a group in which one or more hydrogen atoms bonded to the carbon atom of the alkyl chain in the "substituted haloalkyl group" is further replaced with a substituent; Also included are groups in which one or more hydrogen atoms of a substituent in the "haloalkyl group" are further replaced with a substituent. Specific examples of the "unsubstituted haloalkyl group" include a group in which one or more hydrogen atoms in the "alkyl group" (specific example group G3) are replaced with a halogen atom. A haloalkyl group is sometimes referred to as a halogenated alkyl group.

・“Substituted or unsubstituted alkoxy group”
A specific example of the "substituted or unsubstituted alkoxy group" described in this specification is a group represented by -O(G3), where G3 is a "substituted or unsubstituted alkoxy group" described in specific example group G3. "unsubstituted alkyl group". The number of carbon atoms in the "unsubstituted alkoxy group" is from 1 to 50, preferably from 1 to 30, and more preferably from 1 to 18, unless otherwise specified herein.

・“Substituted or unsubstituted alkylthio group”
A specific example of the "substituted or unsubstituted alkylthio group" described in this specification is a group represented by -S(G3), where G3 is the "substituted or unsubstituted alkylthio group" described in specific example group G3. "unsubstituted alkyl group". Unless otherwise specified herein, the number of carbon atoms in the "unsubstituted alkylthio group" is from 1 to 50, preferably from 1 to 30, and more preferably from 1 to 18.

・“Substituted or unsubstituted aryloxy group”
A specific example of the "substituted or unsubstituted aryloxy group" described in this specification is a group represented by -O(G1), where G1 is a "substituted or unsubstituted aryloxy group" described in specific example group G1. or an unsubstituted aryl group. The number of ring carbon atoms in the "unsubstituted aryloxy group" is from 6 to 50, preferably from 6 to 30, and more preferably from 6 to 18, unless otherwise specified herein.

・“Substituted or unsubstituted arylthio group”
A specific example of the "substituted or unsubstituted arylthio group" described in this specification is a group represented by -S(G1), where G1 is the "substituted or unsubstituted arylthio group" described in the specific example group G1. "Unsubstituted aryl group". The number of ring carbon atoms in the "unsubstituted arylthio group" is from 6 to 50, preferably from 6 to 30, and more preferably from 6 to 18, unless otherwise specified herein.

・“Substituted or unsubstituted trialkylsilyl group”
A specific example of the "trialkylsilyl group" described in this specification is a group represented by -Si(G3)(G3)(G3), where G3 is a group described in specific example group G3. It is a "substituted or unsubstituted alkyl group." - A plurality of G3's in Si(G3) (G3) (G3) are mutually the same or different. The number of carbon atoms in each alkyl group of the "trialkylsilyl group" is from 1 to 50, preferably from 1 to 20, and more preferably from 1 to 6, unless otherwise specified herein.

・“Substituted or unsubstituted aralkyl group”
A specific example of the "substituted or unsubstituted aralkyl group" described in this specification is a group represented by -(G3)-(G1), where G3 is a group described in specific example group G3. It is a "substituted or unsubstituted alkyl group", and G1 is a "substituted or unsubstituted aryl group" described in the specific example group G1. Therefore, an "aralkyl group" is a group in which the hydrogen atom of an "alkyl group" is replaced with an "aryl group" as a substituent, and is one embodiment of a "substituted alkyl group." An "unsubstituted aralkyl group" is an "unsubstituted alkyl group" substituted with an "unsubstituted aryl group", and the number of carbon atoms in the "unsubstituted aralkyl group" is determined unless otherwise specified herein. , 7 to 50, preferably 7 to 30, more preferably 7 to 18.
Specific examples of "substituted or unsubstituted aralkyl groups" include benzyl group, 1-phenylethyl group, 2-phenylethyl group, 1-phenylisopropyl group, 2-phenylisopropyl group, phenyl-t-butyl group, α - Naphthylmethyl group, 1-α-naphthylethyl group, 2-α-naphthylethyl group, 1-α-naphthylisopropyl group, 2-α-naphthylisopropyl group, β-naphthylmethyl group, 1-β-naphthylethyl group , 2-β-naphthylethyl group, 1-β-naphthylisopropyl group, and 2-β-naphthylisopropyl group.

The substituted or unsubstituted aryl group described herein is preferably a phenyl group, p-biphenyl group, m-biphenyl group, o-biphenyl group, p-terphenyl group, unless otherwise specified herein. 4-yl group, p-terphenyl-3-yl group, p-terphenyl-2-yl group, m-terphenyl-4-yl group, m-terphenyl-3-yl group, m-terphenyl- 2-yl group, o-terphenyl-4-yl group, o-terphenyl-3-yl group, o-terphenyl-2-yl group, 1-naphthyl group, 2-naphthyl group, anthryl group, phenanthryl group , pyrenyl group, chrysenyl group, triphenylenyl group, fluorenyl group, 9,9'-spirobifluorenyl group, 9,9-dimethylfluorenyl group, and 9,9-diphenylfluorenyl group.

The substituted or unsubstituted heterocyclic group described herein is preferably a pyridyl group, a pyrimidinyl group, a triazinyl group, a quinolyl group, an isoquinolyl group, a quinazolinyl group, a benzimidazolyl group, or a phenol group, unless otherwise specified herein. Nanthrolinyl group, carbazolyl group (1-carbazolyl group, 2-carbazolyl group, 3-carbazolyl group, 4-carbazolyl group, or 9-carbazolyl group), benzocarbazolyl group, azacarbazolyl group, diazacarbazolyl group , dibenzofuranyl group, naphthobenzofuranyl group, azadibenzofuranyl group, diazadibenzofuranyl group, dibenzothiophenyl group, naphthobenzothiophenyl group, azadibenzothiophenyl group, diazadibenzothiophenyl group, ( 9-phenyl)carbazolyl group ((9-phenyl)carbazol-1-yl group, (9-phenyl)carbazol-2-yl group, (9-phenyl)carbazol-3-yl group, or (9-phenyl)carbazole -4-yl group), (9-biphenylyl)carbazolyl group, (9-phenyl)phenylcarbazolyl group, diphenylcarbazol-9-yl group, phenylcarbazol-9-yl group, phenyltriazinyl group, biphenylyl group These include riazinyl group, diphenyltriazinyl group, phenyldibenzofuranyl group, and phenyldibenzothiophenyl group.

In this specification, the carbazolyl group is specifically any of the following groups unless otherwise specified in the specification.

In this specification, the (9-phenyl)carbazolyl group is specifically any of the following groups, unless otherwise stated in the specification.

In the general formulas (TEMP-Cz1) to (TEMP-Cz9), * represents the bonding position.

In this specification, the dibenzofuranyl group and dibenzothiophenyl group are specifically any of the following groups unless otherwise specified in the specification.

In the general formulas (TEMP-34) to (TEMP-41), * represents the bonding position.

Unless otherwise specified herein, the substituted or unsubstituted alkyl group described herein is preferably a methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, and t- Butyl group, etc.

・“Substituted or unsubstituted arylene group”
Unless otherwise specified, the "substituted or unsubstituted arylene group" described in this specification refers to 2 derived from the above "substituted or unsubstituted aryl group" by removing one hydrogen atom on the aryl ring. It is the basis of valence. As a specific example of the "substituted or unsubstituted arylene group" (specific example group G12), by removing one hydrogen atom on the aryl ring from the "substituted or unsubstituted aryl group" described in specific example group G1, Examples include divalent groups derived from the derivatives.

・“Substituted or unsubstituted divalent heterocyclic group”
Unless otherwise specified, the "substituted or unsubstituted divalent heterocyclic group" described herein refers to the "substituted or unsubstituted heterocyclic group" described above, in which one hydrogen atom on the heterocycle is removed. It is a divalent group derived from Specific examples of the "substituted or unsubstituted divalent heterocyclic group" (specific example group G13) include one hydrogen on the heterocycle from the "substituted or unsubstituted heterocyclic group" described in specific example group G2. Examples include divalent groups derived by removing atoms.

・“Substituted or unsubstituted alkylene group”
Unless otherwise specified, the "substituted or unsubstituted alkylene group" described in this specification refers to 2 derived from the above "substituted or unsubstituted alkyl group" by removing one hydrogen atom on the alkyl chain. It is the basis of valence. As a specific example of a "substituted or unsubstituted alkylene group" (specific example group G14), one hydrogen atom on the alkyl chain is removed from the "substituted or unsubstituted alkyl group" described in specific example group G3. Examples include divalent groups derived from the derivatives.

Unless otherwise stated herein, the substituted or unsubstituted arylene group described herein is preferably a group represented by any of the following general formulas (TEMP-42) to (TEMP-68).

In the general formulas (TEMP-42) to (TEMP-52), Q ₁ to Q ₁₀ are each independently a hydrogen atom or a substituent.
In the general formulas (TEMP-42) to (TEMP-52), * represents the bonding position.

In the general formulas (TEMP-53) to (TEMP-62), Q ₁ to Q ₁₀ are each independently a hydrogen atom or a substituent.
Formulas Q ₉ and Q ₁₀ may be bonded to each other via a single bond to form a ring.
In the general formulas (TEMP-53) to (TEMP-62), * represents the bonding position.

In the general formulas (TEMP-63) to (TEMP-68), Q ₁ to Q ₈ are each independently a hydrogen atom or a substituent.
In the general formulas (TEMP-63) to (TEMP-68), * represents the bonding position.

The substituted or unsubstituted divalent heterocyclic group described herein is preferably one of the following general formulas (TEMP-69) to (TEMP-102), unless otherwise specified herein. It is.

In the general formulas (TEMP-69) to (TEMP-82), Q ₁ to Q ₉ are each independently a hydrogen atom or a substituent.

In the general formulas (TEMP-83) to (TEMP-102), Q ₁ to Q ₈ are each independently a hydrogen atom or a substituent.

The above is an explanation of the "substituents described in this specification."

・"When combining to form a ring"
In the present specification, "one or more pairs of two or more adjacent groups are bonded to each other to form a substituted or unsubstituted monocycle, or bonded to each other to form a substituted or unsubstituted fused ring." or do not bond to each other'' means ``one or more pairs of two or more adjacent groups bond to each other to form a substituted or unsubstituted monocycle''; One or more pairs of two or more adjacent groups bond to each other to form a substituted or unsubstituted condensed ring, and one or more pairs of two or more adjacent groups do not bond to each other. ” means if and.
In this specification, when "one or more sets of two or more adjacent rings are bonded to each other to form a substituted or unsubstituted monocycle" and "one or more sets of two or more adjacent rings are combined with each other to form a substituted or unsubstituted monocycle" Regarding the case where "a pair or more are combined with each other to form a substituted or unsubstituted condensed ring" (hereinafter, these cases may be collectively referred to as "a case where they are combined to form a ring"), the following ,explain. The case of an anthracene compound represented by the following general formula (TEMP-103) whose parent skeleton is an anthracene ring will be explained as an example.

For example, in the case where "one or more of the sets of two or more adjacent R ₉₂₁ to R ₉₃₀ are bonded to each other to form a ring", the set of two or more adjacent R 930 is one set. is a set of R ₉₂₁ and R ₉₂₂ , a set of R ₉₂₂ and R ₉₂₃ , a set of R ₉₂₃ and R ₉₂₄ , a set of R ₉₂₄ and R ₉₃₀ , a set of R ₉₃₀ and R ₉₂₅ , a set of R ₉₂₅ and A set of R ₉₂₆ , a set of R ₉₂₆ and R ₉₂₇ , a set of R ₉₂₇ and R ₉₂₈ , a set of R ₉₂₈ and R ₉₂₉ , and a set of R ₉₂₉ and R ₉₂₁ .

The above-mentioned "one or more sets" means that two or more sets of the above-mentioned two or more adjacent sets may form a ring at the same time. For example, when R ₉₂₁ and R ₉₂₂ combine with each other to form ring Q _A , and at the same time R ₉₂₅ and R ₉₂₆ combine with each other to form ring Q _B , the above general formula (TEMP-103) The anthracene compound represented is represented by the following general formula (TEMP-104).

The case where "a set of two or more adjacent items" forms a ring is not only the case where a set of "two" adjacent items are combined as in the example above, but also the case where a set of "three or more adjacent items" form a ring. This also includes the case where two sets are combined. For example, R ₉₂₁ and R ₉₂₂ combine with each other to form a ring Q _A , R ₉₂₂ and R ₉₂₃ combine with each other to form a ring Q _C , and the three adjacent to each other (R ₉₂₁ , R ₉₂₂ and R ₉₂₃ ) combine with each other to form a ring and are condensed to the anthracene mother skeleton. In this case, the anthracene compound represented by the general formula (TEMP-103) is as follows: It is represented by the general formula (TEMP-105). In the following general formula (TEMP-105), ring Q _A and ring Q _C share R ₉₂₂ .

The "single ring" or "fused ring" that is formed may be a saturated ring or an unsaturated ring as the structure of only the formed ring. Even if "one set of two adjacent rings" forms a "monocycle" or "fused ring," the "monocycle" or "fused ring" is a saturated ring, or Can form unsaturated rings. For example, ring Q _A and ring Q _B formed in the general formula (TEMP-104) are each a "monocyclic ring" or a "fused ring." Furthermore, the ring Q _A and the ring Q _C formed in the general formula (TEMP-105) are "fused rings". Ring Q _A and ring Q _C in the general formula (TEMP-105) are a condensed ring due to the condensation of ring Q _A and ring Q _C. When ring Q _A in the general formula (TMEP-104) is a benzene ring, ring Q _A is a monocyclic ring. When ring Q _A in the general formula (TMEP-104) is a naphthalene ring, ring Q _A is a fused ring.

"Unsaturated ring" means an aromatic hydrocarbon ring or an aromatic heterocycle. "Saturated ring" means an aliphatic hydrocarbon ring or a non-aromatic heterocycle.
Specific examples of the aromatic hydrocarbon ring include structures in which the groups listed as specific examples in specific example group G1 are terminated with hydrogen atoms.
Specific examples of the aromatic heterocycle include structures in which the aromatic heterocyclic group listed as a specific example in specific example group G2 is terminated with a hydrogen atom.
Specific examples of the aliphatic hydrocarbon ring include structures in which the groups listed as specific examples in specific example group G6 are terminated with hydrogen atoms.
"Form a ring" means to form a ring with only a plurality of atoms of a parent skeleton, or with a plurality of atoms of a parent skeleton and one or more arbitrary elements. For example, the ring Q _A shown in the general formula (TEMP-104) formed by R ₉₂₁ and R ₉₂₂ bonding to each other is a carbon atom of the anthracene skeleton to which R ₉₂₁ is bonded, and an anthracene bond to which R ₉₂₂ is bonded. It means a ring formed by a carbon atom in the skeleton and one or more arbitrary elements. As a specific example, when R ₉₂₁ and R ₉₂₂ form a ring Q _A , the carbon atom of the anthracene skeleton to which R ₉₂₁ is bonded, the carbon atom of the anthracene skeleton to which R ₉₂₂ is bonded, and four carbon atoms. When R 921 and R 922 form a monocyclic unsaturated ring, the ring formed by R ₉₂₁ and R ₉₂₂ is a benzene ring.

Here, the "arbitrary element" is preferably at least one element selected from the group consisting of carbon element, nitrogen element, oxygen element, and sulfur element, unless otherwise specified in this specification. In any element (for example, in the case of a carbon element or a nitrogen element), a bond that does not form a ring may be terminated with a hydrogen atom or the like, or may be substituted with an "arbitrary substituent" described below. When any element other than carbon is included, the ring formed is a heterocycle.
Unless otherwise specified herein, the number of "one or more arbitrary elements" constituting a monocyclic or condensed ring is preferably 2 to 15, more preferably 3 to 12. , more preferably 3 or more and 5 or less.
Unless otherwise specified herein, "monocycle" is preferred among "monocycle" and "fused ring."
Unless otherwise specified herein, the "unsaturated ring" is preferred between the "saturated ring" and the "unsaturated ring".
Unless otherwise stated herein, a "monocycle" is preferably a benzene ring.
Unless otherwise stated herein, an "unsaturated ring" is preferably a benzene ring.
When "one or more pairs of two or more adjacent groups" are "bonded with each other to form a substituted or unsubstituted monocycle" or "bonded with each other to form a substituted or unsubstituted fused ring" In the case of "forming", unless otherwise specified herein, preferably, one or more of the pairs of two or more adjacent atoms are bonded to each other to form a bond with a plurality of atoms of the parent skeleton and one or more of the 15 or more atoms. A substituted or unsubstituted "unsaturated ring" is formed with at least one element selected from the group consisting of the following carbon elements, nitrogen elements, oxygen elements, and sulfur elements.

When the above-mentioned "single ring" or "fused ring" has a substituent, the substituent is, for example, the "arbitrary substituent" described below. Specific examples of the substituent in the case where the above-mentioned "single ring" or "fused ring" has a substituent are the substituents described in the section of "Substituent described herein" above.
When the above-mentioned "saturated ring" or "unsaturated ring" has a substituent, the substituent is, for example, the "arbitrary substituent" described below. Specific examples of the substituent in the case where the above-mentioned "single ring" or "fused ring" has a substituent are the substituents described in the section of "Substituent described herein" above.
The above applies to cases in which "one or more sets of two or more adjacent groups combine with each other to form a substituted or unsubstituted monocycle" and "one or more sets of two or more adjacent groups" are combined with each other to form a substituted or unsubstituted condensed ring ("the case where they are combined to form a ring").

・Substituent in the case of "substituted or unsubstituted" In one embodiment in this specification, the substituent in the case of "substituted or unsubstituted" (herein referred to as "arbitrary substituent") For example,
unsubstituted alkyl group having 1 to 50 carbon atoms,
unsubstituted alkenyl group having 2 to 50 carbon atoms,
unsubstituted alkynyl group having 2 to 50 carbon atoms,
an unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
-Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
-O-(R ₉₀₄ ),
-S- (R ₉₀₅ ),
-N(R ₉₀₆ )(R ₉₀₇ ),
Halogen atom, cyano group, nitro group,
A group selected from the group consisting of an unsubstituted aryl group having 6 to 50 ring carbon atoms, and an unsubstituted heterocyclic group having 5 to 50 ring atoms,
Here, R ₉₀₁ to R ₉₀₇ are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A substituted or unsubstituted aryl group having 6 to 50 ring atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.
When two or more R _901s exist, the two or more R _901s are the same or different,
When two or more R _902s exist, the two or more R _902s are the same or different,
When two or more R _903s exist, the two or more R _903s are the same or different,
When two or more R _904s exist, the two or more R _904s are the same or different,
When two or more R _905s exist, the two or more R _905s are the same or different,
When two or more R _906s exist, the two or more R _906s are the same or different,
When two or more R _907s exist, the two or more R _907s are the same or different.

In one embodiment, the substituent in the case of "substituted or unsubstituted" is
an alkyl group having 1 to 50 carbon atoms,
A group selected from the group consisting of an aryl group having 6 to 50 ring carbon atoms and a heterocyclic group having 5 to 50 ring atoms.

In one embodiment, the substituent in the case of "substituted or unsubstituted" is
an alkyl group having 1 to 18 carbon atoms,
A group selected from the group consisting of an aryl group having 6 to 18 ring carbon atoms and a heterocyclic group having 5 to 18 ring atoms.

Specific examples of each group of the above-mentioned arbitrary substituents are the specific examples of the substituents described in the section of "Substituents described in this specification" above.

Unless otherwise specified in this specification, any adjacent substituents may form a "saturated ring" or "unsaturated ring", preferably a substituted or unsubstituted saturated ring. Forms a membered ring, a substituted or unsubstituted saturated 6-membered ring, a substituted or unsubstituted unsaturated 5-membered ring, or a substituted or unsubstituted unsaturated 6-membered ring, more preferably a benzene ring do.
Unless otherwise specified herein, any substituent may further have a substituent. The substituents that the arbitrary substituents further have are the same as the above arbitrary substituents.

In this specification, the numerical range expressed using "AA-BB" has the numerical value AA written before "AA-BB" as the lower limit, and the numerical value BB written after "AA-BB". means a range that includes as an upper limit value.

[First embodiment]
The compound according to the first embodiment is a compound represented by the following general formula (1).

The compound according to the first embodiment (the compound represented by the general formula (1) above) has D ₁ and D ₂ bonded to the 4- and 6-position carbon atoms of 1,3-dicyanobenzene, respectively, and the 2-position has a structure in which Rx that satisfies specific requirements is bonded to the carbon atom of , and no substituent is bonded to the carbon atom at the 5th position.
Since D ₁ and D ₂ have donor properties and skeletons with high lowest excited triplet energy, they have the function of suppressing thermal deactivation from the lowest excited triplet state.
Further, in the compound according to the first embodiment, since no substituent is bonded to the 5-position carbon atom of 1,3-dicyanobenzene, the axial rotation of the molecule is suppressed. As a result, it is thought that the function of D ₁ and D ₂ (the function of suppressing thermal deactivation from the lowest excited triplet state) is more likely to be expressed.
Therefore, according to the compound according to the first embodiment, for example, D ₁ and D ₂ are bonded to the 4-position and 6-position carbon atoms of 1,3-dicyanobenzene, respectively, and a substituent is attached to the 5-position carbon atom. The luminous efficiency of an organic EL device can be improved compared to a compound in which

In the compound according to the present embodiment, the benzene ring of the general formula (1) to which the groups represented by the general formulas (11) to (13) are bonded is explicitly shown in the general formula (1). is the benzene ring itself, and is not the benzene ring contained in Rx, D ₁ and D ₂ .

In the general formula (12), it is preferable that any set of two or more adjacent ones of R ₁₁ to R ₁₈ do not bond to each other.
In the general formula (12), a group of two or more adjacent ones of R ₁₁ to R ₁₈ are bonded to each other to form a substituted or unsubstituted monocycle, or are bonded to each other to form a substituted or substituted monocyclic ring. Alternatively, it is also preferable to form an unsubstituted fused ring.
In the general formula (13), it is preferable that any set of two or more adjacent ones of R ₁₁₁ to R ₁₁₈ do not bond to each other.
In the general formula (13), a group of two or more adjacent ones of R ₁₁₁ to R ₁₁₈ bond to each other to form a substituted or unsubstituted monocycle, or bond to each other to form a substituted or unsubstituted monocycle. Alternatively, it is also preferable to form an unsubstituted fused ring.

The compound according to the first embodiment preferably has at least one group represented by the general formula (12).
The compound according to the first embodiment preferably has two groups represented by the general formula (12).

In the general formula (12), p is preferably 2 or 3, and more preferably 2.
In the general formula (13), px and py are each independently preferably 2, 3 or 4.

In the compound according to the first embodiment, p is 2 or 3 in at least one of D ₁ and D ₂ , and the ring structure A is a ring represented by the general formula (15A) or (15B). A group represented by the above general formula (12) containing a structure is preferable.
In the compound according to the first embodiment, p is 2 in at least one of D ₁ and D ₂ , and the ring structure A is a ring structure represented by the general formula (15A) or (15B). It is preferable that it is a group represented by the above general formula (12) containing.

In the compound according to the first embodiment, ring structure A, ring structure B, and ring structure C each independently belong to the group consisting of ring structures represented by general formulas (14), (15A), and (15B). Any selected ring structure is preferred.

In the compound according to the first embodiment, the group represented by the general formula (12) is represented by the following general formulas (12A), (12B), (12C), (12D), (12E) and (12F). It is preferable that it is any group selected from the group consisting of the following groups.

(In the general formulas (12A), (12B), (12C), (12D), (12E) and (12F),
X ₁ is NR ₁₂₀ , a sulfur atom, or an oxygen atom,
R ₁₁ to R ₁₈ each independently have the same meaning as R ₁₁ to R ₁₈ in the general formula (12),
R ₁₉ and R ₂₀ each independently have the same meaning as R ₁₉ and R ₂₀ in the general formula (14),
R ₁₂₀ has the same meaning as R ₁₂₀ in the general formula (15),
* in the general formulas (12A), (12B), (12C), (12D), (12E) and (12F) indicates the bonding position with the benzene ring in the general formula (1). )

In the compound according to the first embodiment, the group represented by the general formula (12) is any one selected from the group consisting of the groups represented by the general formulas (12A), (12D), and (12F). It is preferable that it is a group of
In the compound according to the first embodiment, the group represented by the general formula (12) is preferably a group represented by the general formula (12F).
In the compound according to the first embodiment, the group represented by the general formula (12) is any one selected from the group consisting of the groups represented by the general formulas (12A), (12D), and (12F). and X ₁ is preferably an oxygen atom or a sulfur atom.

In the compound according to the first embodiment, the compound represented by the general formula (1) is preferably a compound represented by any of the following general formulas (1-1) to (1-6).

(In the general formulas (1-1) to (1-6), Rx, X ₁ and R ₁₁ to R ₂₀ each independently represent Rx, X ₁ and R ₁₁ to R ₂₀ in the general formula (1). (synonymous with).

In the compound according to the first embodiment, X ₁ is preferably an oxygen atom or a sulfur atom.

In the compound according to the first embodiment, R ₁ to R ₈ , R ₁₁ to R ₂₀ , R ₁₁₁ to R ₁₁₈ and R ₁₂₀ each independently represent a hydrogen atom, a substituted or unsubstituted ring having 6 to 30 carbon atoms; an aryl group, a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, a substituted or unsubstituted alkyl group having 1 to 30 ring atoms, or a substituted or unsubstituted cyclo group having 3 to 30 ring atoms. Preferably it is an alkyl group.

In the compound according to the first embodiment, R ₁ to R ₈ , R ₁₁ to R ₂₀ , R ₁₁₁ to R ₁₁₈ and R ₁₂₀ each independently represent a hydrogen atom, a substituted or unsubstituted ring having 6 to 14 carbon atoms; an aryl group, a substituted or unsubstituted heterocyclic group having 5 to 14 ring atoms, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted cyclo group having 3 to 6 ring atoms; Preferably it is an alkyl group.
In the compound according to the first embodiment, R ₁ to R ₈ , R ₁₁ to R ₂₀ and R ₁₁₁ to R ₁₁₈ are each independently a hydrogen atom, an unsubstituted aryl group having 6 to 14 ring carbon atoms, and an unsubstituted aryl group having 6 to 14 ring carbon atoms. It is preferably a substituted heterocyclic group having 5 to 14 ring atoms, an unsubstituted alkyl group having 1 to 6 carbon atoms, or an unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms.

In the compound according to the first embodiment, R ₁₂₀ is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 ring forming carbon atoms, or a substituted or unsubstituted ring A heterocyclic group having 5 to 18 atoms is preferable.
In the compound according to the first embodiment, R ₁₂₀ is an unsubstituted alkyl group having 1 to 6 carbon atoms, an unsubstituted aryl group having 6 to 18 ring atoms, or an unsubstituted aryl group having 5 to 18 ring atoms. More preferably, it is a heterocyclic group.

Rx is a halogen atom, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted alkyl group having 5 to 6 carbon atoms, or a substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms; , substituted or unsubstituted arylsilyl group having 6 to 30 ring carbon atoms, substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms, substituted or unsubstituted aryloxy group having 6 to 14 ring carbon atoms, substituted or an unsubstituted alkylamino group having 2 to 12 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 6 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 14 ring-forming carbon atoms; Imidazolyl group, substituted or unsubstituted pyrazolyl group, substituted or unsubstituted triazolyl group, substituted or unsubstituted tetrazolyl group, substituted or unsubstituted oxazolyl group, substituted or unsubstituted isoxazolyl group, substituted or unsubstituted oxadiazolyl group , substituted or unsubstituted thiazolyl group, substituted or unsubstituted isothiazolyl group, substituted or unsubstituted thiadiazolyl group, substituted or unsubstituted indolyl group, substituted or unsubstituted isoindolyl group, substituted or unsubstituted indolizinyl group, substituted or unsubstituted quinolidinyl group, substituted or unsubstituted quinolyl group, substituted or unsubstituted isoquinolyl group, substituted or unsubstituted cinnolyl group, substituted or unsubstituted phthalazinyl group, substituted or unsubstituted quinazolinyl group, substituted or unsubstituted Substituted quinoxalinyl group, substituted or unsubstituted benzimidazolyl group, substituted or unsubstituted indazolyl group, substituted or unsubstituted phenanthrolinyl group, substituted or unsubstituted phenanthridinyl group, substituted or unsubstituted acridinyl group , substituted or unsubstituted phenazinyl group, substituted or unsubstituted benzocarbazolyl group, substituted or unsubstituted morpholino group, substituted or unsubstituted phenoxazinyl group, substituted or unsubstituted phenothiazinyl group, substituted or unsubstituted phenothiazinyl group Azacarbazolyl group, substituted or unsubstituted diazacarbazolyl group. Substituted or unsubstituted furyl group, substituted or unsubstituted oxazolyl group, substituted or unsubstituted isoxazolyl group, substituted or unsubstituted oxadiazolyl group, substituted or unsubstituted xanthenyl group, substituted or unsubstituted benzofuranyl group, substituted or unsubstituted Unsubstituted isobenzofuranyl group, substituted or unsubstituted dibenzofuranyl group, substituted or unsubstituted naphthobenzofuranyl group, substituted or unsubstituted benzoxazolyl group, substituted or unsubstituted benzisoxazolyl group substituted or unsubstituted phenoxazinyl group, substituted or unsubstituted morpholino group, substituted or unsubstituted dinaphthofuranyl group, substituted or unsubstituted azadibenzofuranyl group, substituted or unsubstituted diazadibenzofuranyl group, Substituted or unsubstituted azanaphthobenzofuranyl group, substituted or unsubstituted diazanaphthobenzofuranyl group. Substituted or unsubstituted thienyl group, substituted or unsubstituted thiazolyl group, substituted or unsubstituted isothiazolyl group, substituted or unsubstituted thiadiazolyl group, substituted or unsubstituted benzothiophenyl group, substituted or unsubstituted isobenzothio Phenyl group, substituted or unsubstituted dibenzothiophenyl group, substituted or unsubstituted naphthobenzothiophenyl group, substituted or unsubstituted benzothiazolyl group, substituted or unsubstituted benzisothiazolyl group, substituted or unsubstituted phenothiazinyl group, substituted or unsubstituted dinaphthothiophenyl group, substituted or unsubstituted azadibenzothiophenyl group, substituted or unsubstituted diazadibenzothiophenyl group, substituted or unsubstituted azanaphthobenzothiophenyl group, substituted or It is preferably an unsubstituted diazanaphthobenzothiophenyl group, a group represented by the above formula (12), or a group represented by the above formula (13).

In the compound according to the first embodiment, Rx represents a halogen atom, an unsubstituted aryl group having 6 to 14 ring carbon atoms, an unsubstituted alkyl group having 5 to 6 carbon atoms, and an unsubstituted aryl group having 3 to 6 carbon atoms. Alkylsilyl group, unsubstituted arylsilyl group having 6 to 30 ring carbon atoms, unsubstituted alkoxy group having 1 to 6 carbon atoms, unsubstituted aryloxy group having 6 to 14 ring carbon atoms, unsubstituted carbon Alkylamino group having 2 to 12 carbon atoms, unsubstituted alkylthio group having 1 to 6 carbon atoms, unsubstituted arylthio group having 6 to 14 ring carbon atoms, unsubstituted quinolyl group, unsubstituted isoquinolyl group, unsubstituted Quinazolinyl group, unsubstituted benzimidazolyl group, unsubstituted phenanthrolinyl group, substituted or unsubstituted benzocarbazolyl group, substituted or unsubstituted azacarbazolyl group, substituted or unsubstituted diazacarbazolyl group, unsubstituted Substituted dibenzofuranyl group, unsubstituted naphthobenzofuranyl group, unsubstituted azadibenzofuranyl group, unsubstituted diazadibenzofuranyl group, unsubstituted dibenzothiophenyl group, unsubstituted naphthobenzothiophenyl group , an unsubstituted azadibenzothiophenyl group, or an unsubstituted diazadibenzothiophenyl group.

In the compound according to the first embodiment, Rx is an unsubstituted aryl group having 6 to 14 ring carbon atoms, an unsubstituted alkyl group having 5 to 6 carbon atoms, an unsubstituted quinolyl group, an unsubstituted isoquinolyl group, Unsubstituted quinazolinyl group, unsubstituted benzimidazolyl group, unsubstituted phenanthrolinyl group, substituted or unsubstituted benzocarbazolyl group, substituted or unsubstituted azacarbazolyl group, substituted or unsubstituted diazacarbazolyl group, unsubstituted dibenzofuranyl group, unsubstituted naphthobenzofuranyl group, unsubstituted azadibenzofuranyl group, unsubstituted diazadibenzofuranyl group, unsubstituted dibenzothiophenyl group, unsubstituted naphtho Preferably, it is a benzothiophenyl group, an unsubstituted azadibenzothiophenyl group, or an unsubstituted diazadibenzothiophenyl group.
In the compound according to the first embodiment, Rx is more preferably a substituted or unsubstituted phenyl group.

In the compound according to the first embodiment, the substituent in the case of "substituted or unsubstituted" is preferably "unsubstituted".

(Method for manufacturing a compound according to the first embodiment)
The compound according to the first embodiment can be produced according to the synthesis method described in the Examples described later, or by imitating the synthesis method and using known alternative reactions and raw materials according to the desired product.

(Specific example of compound according to first embodiment)
Specific examples of the compound according to the first embodiment include the following compounds. However, the present invention is not limited to these specific examples. In this specification, a deuterium atom is expressed as D in a chemical formula, and a light hydrogen atom is expressed as H or its description is omitted.

[Second embodiment]
The compound according to the second embodiment is a compound represented by the following general formula (1A).

The compound according to the second embodiment (the compound represented by the general formula (1A)) has D ₃ and D ₄ bonded to the carbon atoms at the 4-position and 6-position, respectively, of 1,3-dicyanobenzene, and the 5-position It has a structure in which Ry meeting specific requirements is bonded to the carbon atom of , and no substituent is bonded to the carbon atom at the 2-position.
In the compound according to the second embodiment, since no substituent is bonded to the carbon atom at the 2-position of 1,3-dicyanobenzene, steric hindrance of the molecules is reduced and the molecules can easily approach each other. As a result, it is thought that the overlapping of orbits between molecules increases, which improves carrier hopping probability and improves carrier transportability.
Therefore, according to the compound according to the second embodiment, for example, D ₃ and D ₄ are bonded to the 4-position and 6-position carbon atoms of 1,3-dicyanobenzene, respectively, and a substituent is attached to the 2-position carbon atom. The life of an organic EL element can be improved compared to a compound in which

In the compound according to the present embodiment, the benzene ring of the general formula (1A) to which the groups represented by the general formulas (11) to (13) are bonded is explicitly shown in the general formula (1A). is the benzene ring itself, and is not the benzene ring contained in Rx, D ₁ and D ₂ .

Further, in the compound according to the second embodiment, when Ry is a substituted or unsubstituted aryl group, the number of ring carbon atoms of the aryl group is 13 or more and 30 or less.
In the compound according to the second embodiment, when Ry is a substituted or unsubstituted aryl group having 13 to 30 ring-forming carbon atoms, the orbital is wider than when Ry is a phenyl group. It is thought that the orbits between molecules are more likely to overlap, and the effect of improving carrier transport properties is more likely to be expressed.
Therefore, according to the compound according to the second embodiment, the life of the organic EL element can be improved compared to the case where Ry is a phenyl group.

The compound according to the second embodiment preferably has at least one group represented by the general formula (12).
The compound according to the second embodiment preferably has two groups represented by the general formula (12).

In the compound according to the second embodiment, at least one of D ₃ and D ₄ has p of 2 or 3, and the ring structure A is a ring represented by the general formula (15A) or (15B). A group represented by the above general formula (12) containing a structure is preferable.
In the compound according to the second embodiment, at least one of D ₃ and D ₄ has p as 2, and the ring structure A is a ring structure represented by the general formula (15A) or (15B). It is preferable that it is a group represented by the above general formula (12) containing.
In the compound according to the second embodiment, ring structure A, ring structure B, and ring structure C each independently belong to the group consisting of ring structures represented by general formulas (14), (15A), and (15B). Any selected ring structure is preferred.

In the compound according to the second embodiment, the group represented by the general formula (12) is represented by the general formulas (12A), (12B), (12C), (12D), (12E) and (12F). It is preferable that it is any group selected from the group consisting of the following groups.
However, * in the general formulas (12A), (12B), (12C), (12D), (12E) and (12F) indicates the bonding position with the benzene ring in the general formula (1A).

In the compound according to the second embodiment, the group represented by the general formula (12) is any one selected from the group consisting of the groups represented by the general formulas (12A), (12D), and (12F). It is preferable that it is a group of
In the compound according to the second embodiment, the group represented by the general formula (12) is preferably a group represented by the general formula (12F).
In the compound according to the second embodiment, the group represented by the general formula (12) is any one selected from the group consisting of the groups represented by the general formulas (12A), (12D), and (12F). and X ₁ is preferably an oxygen atom or a sulfur atom.

In the compound according to the second embodiment, the compound represented by the general formula (1A) is preferably a compound represented by any of the following general formulas (1-1A) to (1-6A).

(In the general formulas (1-1A) to (1-6A), Ry, X ₁ and R ₁₁ to R ₂₀ each independently represent Ry, X ₁ and R ₁₁ to R ₂₀ in the general formula (1A). (synonymous with).

In the compound according to the second embodiment, X ₁ is preferably an oxygen atom or a sulfur atom.

In the compound according to the second embodiment, R ₁ to R ₈ , R ₁₁ to R ₁₈ , R ₁₁₁ to R ₁₁₈ and R ₁₂₀ are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted carbon number of 1 to 30 alkyl group, substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms, substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms, substituted or unsubstituted ring having 6 to 60 carbon atoms Arylsilyl group, substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, substituted or unsubstituted alkylamino group having 2 to 30 carbon atoms, Substituted or unsubstituted arylamino group having 6 to 60 ring carbon atoms, substituted or unsubstituted alkylthio group having 1 to 30 ring carbon atoms, substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms; Substituted phenyl group (preferably unsubstituted phenyl group), substituted or unsubstituted terphenyl group, substituted or unsubstituted naphthyl group, substituted or unsubstituted anthryl group, substituted or unsubstituted benzanthryl group, substituted or unsubstituted phenanthryl group, substituted or unsubstituted benzophenanthryl group, substituted or unsubstituted phenalenyl group, substituted or unsubstituted pyrenyl group, substituted or unsubstituted chrysenyl group, substituted or unsubstituted benzochrysenyl group, Substituted or unsubstituted triphenylenyl group, substituted or unsubstituted benzotriphenylenyl group, substituted or unsubstituted tetracenyl group, substituted or unsubstituted pentacenyl group, substituted or unsubstituted fluorenyl group, substituted or unsubstituted 9, 9'-spirobifluorenyl group, substituted or unsubstituted benzofluorenyl group, substituted or unsubstituted dibenzofluorenyl group, substituted or unsubstituted fluoranthenyl group, substituted or unsubstituted benzofluoran thenyl group, substituted or unsubstituted perylenyl group, substituted or unsubstituted imidazolyl group, substituted or unsubstituted pyrazolyl group, substituted or unsubstituted triazolyl group, substituted or unsubstituted tetrazolyl group, substituted or unsubstituted oxazolyl group , substituted or unsubstituted isoxazolyl group, substituted or unsubstituted oxadiazolyl group, substituted or unsubstituted thiazolyl group, substituted or unsubstituted isothiazolyl group, substituted or unsubstituted thiadiazolyl group, substituted or unsubstituted pyridyl group, substituted or an unsubstituted pyridazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, a substituted or unsubstituted triazinyl group, a substituted or unsubstituted indolyl group, a substituted or unsubstituted isoindolyl group, a substituted or unsubstituted isoindolyl group, Substituted indolizinyl group, substituted or unsubstituted quinolidinyl group, substituted or unsubstituted quinolyl group, substituted or unsubstituted isoquinolyl group, substituted or unsubstituted cinnolyl group, substituted or unsubstituted phthalazinyl group, substituted or unsubstituted Quinazolinyl group, substituted or unsubstituted quinoxalinyl group, substituted or unsubstituted benzimidazolyl group, substituted or unsubstituted indazolyl group, substituted or unsubstituted phenanthrolinyl group, substituted or unsubstituted phenanthridinyl group, substituted or unsubstituted acridinyl group, substituted or unsubstituted phenazinyl group, substituted or unsubstituted carbazolyl group, substituted or unsubstituted benzocarbazolyl group, substituted or unsubstituted morpholino group, substituted or unsubstituted phenoxazinyl group, Substituted or unsubstituted phenothiazinyl group, substituted or unsubstituted azacarbazolyl group, substituted or unsubstituted diazacarbazolyl group. Substituted or unsubstituted furyl group, substituted or unsubstituted oxazolyl group, substituted or unsubstituted isoxazolyl group, substituted or unsubstituted oxadiazolyl group, substituted or unsubstituted xanthenyl group, substituted or unsubstituted benzofuranyl group, substituted or unsubstituted Unsubstituted isobenzofuranyl group, substituted or unsubstituted naphthobenzofuranyl group, substituted or unsubstituted benzoxazolyl group, substituted or unsubstituted benzisoxazolyl group, substituted or unsubstituted phenoxazinyl group , substituted or unsubstituted morpholino group, substituted or unsubstituted dinaphthofuranyl group, substituted or unsubstituted azadibenzofuranyl group, substituted or unsubstituted diazadibenzofuranyl group, substituted or unsubstituted azanaphthobenzofuranyl group group, substituted or unsubstituted diazanaphthobenzofuranyl group, substituted or unsubstituted thienyl group, substituted or unsubstituted thiazolyl group, substituted or unsubstituted isothiazolyl group, substituted or unsubstituted thiadiazolyl group, substituted or unsubstituted thiazolyl group Substituted benzothiophenyl group, substituted or unsubstituted isobenzothiophenyl group, substituted or unsubstituted dibenzothiophenyl group, substituted or unsubstituted naphthobenzothiophenyl group, substituted or unsubstituted benzothiazolyl group, substituted or unsubstituted benzothiazolyl group Substituted benzisothiazolyl group, substituted or unsubstituted phenothiazinyl group, substituted or unsubstituted dinaphthothiophenyl group, substituted or unsubstituted azadibenzothiophenyl group, substituted or unsubstituted diazadibenzothiophenyl group , a substituted or unsubstituted azanaphthobenzothiophenyl group, or a substituted or unsubstituted diazanaphthobenzothiophenyl group.

In the compound according to the second embodiment, R ₁ to R ₈ , R ₁₁ to R ₂₀ , R ₁₁₁ to R ₁₁₈ and R ₁₂₀ are each independently a hydrogen atom, substituted or unsubstituted alkyl having 1 to 30 carbon atoms. group, substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms, substituted or unsubstituted phenyl group (preferably unsubstituted phenyl group), substituted or unsubstituted naphthyl group, substituted or unsubstituted imidazolyl group group, substituted or unsubstituted pyrazolyl group, substituted or unsubstituted triazolyl group, substituted or unsubstituted tetrazolyl group, substituted or unsubstituted oxazolyl group, substituted or unsubstituted isoxazolyl group, substituted or unsubstituted oxadiazolyl group, Substituted or unsubstituted thiazolyl group, substituted or unsubstituted isothiazolyl group, substituted or unsubstituted thiadiazolyl group, substituted or unsubstituted pyridyl group, substituted or unsubstituted pyridazinyl group, substituted or unsubstituted pyrimidinyl group, substituted or Unsubstituted pyrazinyl group, substituted or unsubstituted triazinyl group, substituted or unsubstituted indolyl group, substituted or unsubstituted isoindolyl group, substituted or unsubstituted indolizinyl group, substituted or unsubstituted quinolidinyl group, substituted or unsubstituted quinolyl group, substituted or unsubstituted isoquinolyl group, substituted or unsubstituted cinnolyl group, substituted or unsubstituted phthalazinyl group, substituted or unsubstituted quinazolinyl group, substituted or unsubstituted quinoxalinyl group, substituted or unsubstituted benzimidazolyl group, substituted or unsubstituted indazolyl group, substituted or unsubstituted morpholino group, substituted or unsubstituted furyl group, substituted or unsubstituted oxazolyl group, substituted or unsubstituted isoxazolyl group, substituted or unsubstituted oxadiazolyl group, It is preferably a substituted or unsubstituted morpholino group, a substituted or unsubstituted thienyl group, a substituted or unsubstituted thiazolyl group, a substituted or unsubstituted isothiazolyl group, or a substituted or unsubstituted thiadiazolyl group.

In the compound according to the second embodiment, R ₁ to R ₈ , R ₁₁ to R ₂₀ and R ₁₁₁ to R ₁₁₈ each independently represent a hydrogen atom, an unsubstituted alkyl group having 1 to 30 carbon atoms, and an unsubstituted alkyl group having 1 to 30 carbon atoms; Cycloalkyl group having 3 to 30 ring carbon atoms, unsubstituted phenyl group, unsubstituted naphthyl group, unsubstituted imidazolyl group, unsubstituted pyrazolyl group, unsubstituted triazolyl group, unsubstituted tetrazolyl group, unsubstituted oxazolyl group, unsubstituted isoxazolyl group, unsubstituted oxadiazolyl group, unsubstituted thiazolyl group, unsubstituted isothiazolyl group, unsubstituted thiadiazolyl group, unsubstituted pyridyl group, unsubstituted pyridazinyl group, unsubstituted pyrimidinyl group, unsubstituted pyrazinyl group, unsubstituted triazinyl group, unsubstituted indolyl group, unsubstituted isoindolyl group, unsubstituted indolizinyl group, unsubstituted quinolidinyl group, unsubstituted quinolyl group, unsubstituted isoquinolyl group, Unsubstituted cinnolyl group, unsubstituted phthalazinyl group, unsubstituted quinazolinyl group, unsubstituted quinoxalinyl group, unsubstituted benzimidazolyl group, unsubstituted indazolyl group, unsubstituted morpholino group, unsubstituted furyl group, unsubstituted may be an oxazolyl group, an unsubstituted isoxazolyl group, an unsubstituted oxadiazolyl group, an unsubstituted morpholino group, an unsubstituted thienyl group, an unsubstituted thiazolyl group, an unsubstituted isothiazolyl group, or an unsubstituted thiadiazolyl group. preferable.

In the compound according to the second embodiment, R ₁₂₀ is a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted aryl group having 6 to 18 ring forming carbon atoms, or a substituted or unsubstituted ring A heterocyclic group having 5 to 18 atoms is preferable.
In the compound according to the second embodiment, R ₁₂₀ is an unsubstituted alkyl group having 1 to 6 carbon atoms, an unsubstituted aryl group having 6 to 18 ring atoms, or an unsubstituted aryl group having 5 to 18 ring atoms. More preferably, it is a heterocyclic group.

In the compound according to the second embodiment, Ry is a halogen atom, a substituted or unsubstituted aryl group having 13 to 30 ring atoms, a substituted or unsubstituted heteroaryl group having 6 to 30 ring atoms, or substituted Alternatively, it is preferably an unsubstituted alkyl group having 5 to 6 carbon atoms.

In the compound according to the second embodiment, Ry is a halogen atom, an unsubstituted aryl group having 13 to 30 ring atoms, an unsubstituted heteroaryl group having 6 to 30 ring atoms, or an unsubstituted heteroaryl group having 6 to 30 ring atoms. It is preferably a 5-6 alkyl group. In the compound according to the second embodiment, Ry is more preferably a substituted or unsubstituted phenyl group.

In the compound according to the second embodiment, the substituent in the case of "substituted or unsubstituted" is preferably "unsubstituted".

(Method for producing compound according to second embodiment)
The compound according to the second embodiment can be produced according to the synthesis method described in the Examples described later, or by imitating the synthesis method and using known alternative reactions and raw materials according to the target product.

(Specific example of compound according to second embodiment)
Specific examples of the compound according to the second embodiment include the following compounds. However, the present invention is not limited to these specific examples.

The following is a description common to the first embodiment and the second embodiment. An embodiment common to the first embodiment and the second embodiment may be referred to as "the embodiment" or "the first embodiment or the second embodiment",
The compound according to the embodiment is preferably a delayed fluorescent compound.

- Delayed fluorescence Delayed fluorescence is explained on pages 261 to 268 of "Device Properties of Organic Semiconductors" (edited by Chihaya Adachi, published by Kodansha). In that literature, it is stated that if the energy difference ΔE ₁₃ between the excited singlet state and excited triplet state of a fluorescent material can be reduced, the reverse energy from the excited triplet state to the excited singlet state, which normally has a low transition probability, can be reduced. It is explained that the transfer occurs with high efficiency and that thermally activated delayed fluorescence (TADF) is expressed. Furthermore, in Figure 10.38 of the document, the mechanism of generation of delayed fluorescence is explained. The compound according to the embodiment is preferably a compound that exhibits thermally activated delayed fluorescence generated by such a mechanism.

In general, delayed fluorescence emission can be confirmed by transient PL (Photo Luminescence) measurement.

The behavior of delayed fluorescence can also be analyzed based on the decay curve obtained from transient PL measurements. Transient PL measurement is a method of irradiating a sample with a pulsed laser to excite it, and measuring the attenuation behavior (transient characteristics) of PL emission after the irradiation is stopped. PL emission in a TADF material is classified into an emission component from singlet excitons generated by initial PL excitation and an emission component from singlet excitons generated via triplet excitons. The lifetime of the singlet exciton generated by the first PL excitation is on the order of nanoseconds, which is very short. Therefore, the light emission from the singlet exciton attenuates quickly after irradiation with the pulsed laser.
On the other hand, delayed fluorescence decays slowly because it is emitted from singlet excitons that are generated via long-lived triplet excitons. As described above, there is a large temporal difference between the light emission from singlet excitons generated by the initial PL excitation and the light emission from singlet excitons generated via triplet excitons. Therefore, the luminescence intensity derived from delayed fluorescence can be determined.

A schematic diagram of an exemplary apparatus for measuring transient PL is shown in FIG. An example of a method for measuring transient PL and behavior analysis of delayed fluorescence using FIG. 1 will be described.

The transient PL measurement device 100 in FIG. 1 includes a pulse laser unit 101 capable of emitting light of a predetermined wavelength, a sample chamber 102 that accommodates a measurement sample, a spectrometer 103 that spectrally spectra the light emitted from the measurement sample, and 2. It includes a streak camera 104 for forming dimensional images, and a personal computer 105 for capturing and analyzing two-dimensional images. Note that the measurement of transient PL is not limited to the apparatus shown in FIG. 1.

The sample accommodated in the sample chamber 102 is obtained by forming a thin film doped with a doping material at a concentration of 12% by mass relative to the matrix material on a quartz substrate.

The thin film sample housed in the sample chamber 102 is irradiated with a pulsed laser from the pulsed laser section 101 to excite the doping material. Emitted light is extracted in a direction 90 degrees with respect to the irradiation direction of the excitation light, the extracted light is separated into spectra by a spectroscope 103, and a two-dimensional image is formed within a streak camera 104. As a result, a two-dimensional image can be obtained in which the vertical axis corresponds to time, the horizontal axis corresponds to wavelength, and the bright spots correspond to emission intensity. By cutting out this two-dimensional image along a predetermined time axis, it is possible to obtain an emission spectrum in which the vertical axis is the emission intensity and the horizontal axis is the wavelength. Moreover, when the two-dimensional image is cut out along the wavelength axis, an attenuation curve (transient PL) can be obtained in which the vertical axis is the logarithm of the emission intensity and the horizontal axis is the time.

For example, a thin film sample A was prepared as described above using reference compound H1 below as a matrix material and reference compound D1 below as a doping material, and transient PL measurement was performed.

Here, the attenuation curves were analyzed using the aforementioned thin film sample A and thin film sample B. Thin film sample B was prepared as described above using the following reference compound H2 as the matrix material and the reference compound D1 as the doping material.

FIG. 2 shows attenuation curves obtained from the transient PL measured for thin film sample A and thin film sample B.

As described above, by transient PL measurement, it is possible to obtain a luminescence attenuation curve with the vertical axis representing the luminous intensity and the horizontal axis representing time. Based on this emission decay curve, the fluorescence intensity of the fluorescence emitted from the singlet excited state generated by photoexcitation and the delayed fluorescence emitted from the singlet excited state generated by reverse energy transfer via the triplet excited state is determined. The ratio can be estimated. In materials with delayed fluorescence, the ratio of the intensity of delayed fluorescence that decays slowly to the intensity of fluorescence that decays quickly is relatively large.

Specifically, there are two types of light emission from a delayed fluorescent material: prompt light emission (immediate light emission) and delayed light emission (delayed light emission). Prompt light emission (immediate light emission) is light emission that is observed immediately from the excited state after being excited by pulsed light (light emitted from a pulsed laser) at a wavelength that the delayed fluorescent material absorbs. Delayed light emission is light emission that is not observed immediately after excitation by the pulsed light but is observed afterward.

The amount of prompt light emission and delay light emission and the ratio thereof can be determined by a method similar to that described in "Nature 492, 234-238, 2012" (Reference Document 1). Note that the device used to calculate the amount of prompt light emission and delay light emission is not limited to the device described in Reference 1 or the device shown in FIG. 1.

In addition, a sample prepared by the following method is used to measure the delayed fluorescence of the compound according to the embodiment. For example, the compound according to the embodiment is dissolved in toluene to prepare a dilute solution having an absorbance of 0.05 or less at the excitation wavelength in order to eliminate the contribution of self-absorption. Furthermore, in order to prevent quenching due to oxygen, the sample solution is frozen and degassed and then sealed in a cell with a lid under an argon atmosphere, thereby making the sample solution saturated with argon and oxygen-free.
The fluorescence spectrum of the above sample solution is measured using a spectrofluorometer FP-8600 (manufactured by JASCO Corporation), and the fluorescence spectrum of an ethanol solution of 9,10-diphenylanthracene is also measured under the same conditions. Using the fluorescence area intensity of both spectra, Morris et al. J. Phys. Chem. The total fluorescence quantum yield is calculated using equation (1) in 80 (1976) 969.

In the embodiment, when the amount of prompt light emission (immediate light emission) of the compound to be measured is X _P and the amount of delayed light emission (delayed light emission) is X _D , the value of X _D /X _P is 0.05. It is preferable that it is above.
In this specification, the measurement of the amount of prompt emission and delay emission and the ratio thereof of a compound other than the compound according to the embodiment described above is similar to the measurement of the amount of prompt emission and delay emission of the compound according to the embodiment and the ratio thereof. be.

・ΔST
In the embodiment, the difference (S ₁ −T _77K ) between the lowest excited singlet energy S ₁ and the energy gap T _77K at 77 [K] is defined as ΔST.

The difference ΔST (M1) between the lowest excited singlet energy S ₁ (M1) of the compound according to the embodiment and the energy gap T _77K (M1) at 77 [K] of the compound according to the embodiment is preferably 0. It is less than .3 eV, more preferably less than 0.2 eV, even more preferably less than 0.1 eV, even more preferably less than 0.01 eV. That is, it is preferable that ΔST(M1) satisfy the relationship of the following formula (Equation 10), (Equation 11), (Equation 12), or (Equation 13).
ΔST(M1)=S ₁ (M1)-T _77K (M1)<0.3eV...(Math. 10)
ΔST(M1)=S ₁ (M1)-T _77K (M1)<0.2eV...(Math. 11)
ΔST(M1)=S ₁ (M1)-T _77K (M1)<0.1eV...(Math. 12)
ΔST(M1)=S ₁ (M1)-T _77K (M1)<0.01eV...(Math. 13)

-Relationship between triplet energy and energy gap at 77[K] Here, the relationship between triplet energy and the energy gap at 77[K] will be explained. In the embodiment, the energy gap at 77 [K] differs from the normally defined triplet energy in some respects.
Triplet energy is measured as follows. First, a sample is prepared by sealing a solution in which a compound to be measured is dissolved in an appropriate solvent in a quartz glass tube. For this sample, measure the phosphorescence spectrum (vertical axis: phosphorescence intensity, horizontal axis: wavelength) at low temperature (77 [K]), draw a tangent to the rise of the short wavelength side of this phosphorescence spectrum, Triplet energy is calculated from a predetermined conversion formula based on the wavelength value at the intersection of the tangent and the horizontal axis.
Here, among the compounds according to the embodiment, the heat-activated delayed fluorescent compound is preferably a compound with a small ΔST. When ΔST is small, intersystem crossing and reverse intersystem crossing are likely to occur even in a low temperature (77 [K]) state, and excited singlet states and excited triplet states coexist. As a result, the spectrum measured in the same manner as above includes light emission from both the excited singlet state and the excited triplet state, and it is difficult to clearly distinguish from which state the light is emitted. , basically the value of triplet energy is considered to be dominant.
Therefore, in the embodiment, although the measurement method is the same as that of the normal triplet energy T, in order to distinguish that they are different in the strict sense, the value measured in the following manner is referred to as the energy gap T _77K . . The compound to be measured is dissolved in EPA (diethyl ether: isopentane: ethanol = 5:5:2 (volume ratio)) to a concentration of 10 μmol/L, and this solution is placed in a quartz cell for measurement. Use as a sample. For this measurement sample, measure the phosphorescence spectrum (vertical axis: phosphorescence intensity, horizontal axis: wavelength) at a low temperature (77 [K]), and draw a tangent to the rise of the short wavelength side of this phosphorescence spectrum. , the energy amount calculated from the following conversion formula (F1) based on the wavelength value λ _edge [nm] at the intersection of the tangent and the horizontal axis is defined as the energy gap T _77K at 77 [K].
Conversion formula (F1): T _77K [eV] = 1239.85/λ _edge

The tangent to the rise of the short wavelength side of the phosphorescence spectrum is drawn as follows. When moving on the spectrum curve from the short wavelength side of the phosphorescence spectrum to the maximum value on the shortest wavelength side among the maximum values of the spectrum, consider the tangent at each point on the curve toward the long wavelength side. The slope of this tangent line increases as the curve rises (ie, as the vertical axis increases). The tangent drawn at the point where the value of this slope takes the maximum value (that is, the tangent at the inflection point) is the tangent to the rise of the short wavelength side of the phosphorescence spectrum.
Note that a local maximum point with a peak intensity that is 15% or less of the maximum peak intensity of the spectrum is not included in the local maximum value on the shortest wavelength side mentioned above, but is included in the maximum value of the slope that is closest to the local maximum value on the shortest wavelength side. The tangent line drawn at the point where the value is taken is the tangent line to the rise of the short wavelength side of the phosphorescence spectrum.
For the measurement of phosphorescence, an F-4500 spectrofluorometer manufactured by Hitachi High-Technologies Corporation can be used. Note that the measurement device is not limited to this, and measurement may be performed by combining a cooling device, a low-temperature container, an excitation light source, and a light receiving device.

・Lowest excited singlet energy S ₁
Examples of the method for measuring the lowest excited singlet energy _S1 using a solution (sometimes referred to as a solution method) include the following method.
A 10 μmol/L toluene solution of the compound to be measured is prepared and placed in a quartz cell, and the absorption spectrum (vertical axis: absorption intensity, horizontal axis: wavelength) of this sample is measured at room temperature (300K). Draw a tangent to the falling edge of the long wavelength side of this absorption spectrum, and substitute the wavelength value λedge [nm] at the intersection of the tangent and the horizontal axis into the conversion formula (F2) shown below to calculate the lowest excited singlet energy. Calculate.
Conversion formula (F2): S ₁ [eV] = 1239.85/λedge
Examples of the absorption spectrum measuring device include, but are not limited to, a spectrophotometer manufactured by Hitachi (device name: U3310).

The tangent to the falling edge of the long wavelength side of the absorption spectrum is drawn as follows. When moving on a spectrum curve in the long wavelength direction from the maximum value on the longest wavelength side among the maximum values of the absorption spectrum, consider tangents at each point on the curve. The slope of this tangent line repeats decreasing and then increasing as the curve falls (that is, as the value on the vertical axis decreases). The tangent line drawn at the point where the slope value takes the minimum value on the longest wavelength side (excluding cases where the absorbance is 0.1 or less) is the tangent to the fall of the long wavelength side of the absorption spectrum.
Note that a maximum point with an absorbance value of 0.2 or less is not included in the maximum value on the longest wavelength side.

[Third embodiment]
(Material for organic electroluminescent devices)
The organic electroluminescent element material according to the third embodiment contains the compound according to the embodiment (first embodiment or second embodiment). Materials for organic electroluminescent devices may be abbreviated as materials for organic EL devices.
One aspect includes a material for an organic EL element that includes only the compound according to the first embodiment, and another aspect includes a material for an organic EL element that includes only the compound according to the first embodiment and the compound according to the first embodiment. Examples include organic EL element materials containing the compound.
In addition, one aspect includes a material for an organic EL element that includes only the compound according to the second embodiment, and another aspect includes the compound according to the second embodiment and the compound in the second embodiment. Examples include materials for organic EL elements containing different other compounds.
In the organic EL element material of the third embodiment, it is preferable that the compound according to the embodiment is a host material. In this case, the organic EL element material may include the compound according to the embodiment as a host material and other compounds such as a dopant material.
Moreover, in the organic EL element material of the third embodiment, it is preferable that the compound according to the embodiment is a thermally activated delayed fluorescent material.

[Fourth embodiment]
(Organic electroluminescent device)
An organic EL element according to a fourth embodiment will be described.
The organic EL element according to the fourth embodiment includes an organic layer between the anode and the cathode. This organic layer includes at least one layer composed of an organic compound. Alternatively, this organic layer is formed by laminating a plurality of layers made of organic compounds. The organic layer may further contain an inorganic compound.

The organic EL element according to the fourth embodiment has an anode, a cathode, and an organic layer, and the organic layer contains the compound according to the first embodiment or the second embodiment as a first compound.

In the organic EL device according to the fourth embodiment, the organic layer preferably has at least one light-emitting layer, and the light-emitting layer preferably contains the compound according to the first embodiment or the second embodiment as a first compound.

The organic layer may be composed of, for example, one light emitting layer, or may include layers that can be employed in an organic EL element. Layers that can be employed in organic EL devices are not particularly limited, but may be selected from the group consisting of, for example, a hole injection layer, a hole transport layer, an electron barrier layer, a hole barrier layer, an electron transport layer, and an electron injection layer. At least one of the layers is mentioned.

In one embodiment, the emissive layer may include a metal complex.
Moreover, in one embodiment, it is also preferable that the light-emitting layer does not contain a metal complex.
Moreover, in one embodiment, it is preferable that the light-emitting layer does not contain a phosphorescent material (dopant material).
Further, in one embodiment, the light emitting layer preferably does not contain a heavy metal complex or a phosphorescent rare earth metal complex. Examples of heavy metal complexes include iridium complexes, osmium complexes, and platinum complexes.

FIG. 3 shows a schematic configuration of an example of an organic EL element according to the fourth embodiment.
The organic EL element 1 includes a transparent substrate 2, an anode 3, a cathode 4, and an organic layer 10 disposed between the anode 3 and the cathode 4. The organic layer 10 is configured by stacking a hole injection layer 6, a hole transport layer 7, a light emitting layer 5, an electron transport layer 8, and an electron injection layer 9 in this order from the anode 3 side. The present invention is not limited to the configuration of the organic EL element shown in FIG. 3.

(Light emitting layer)
In the organic EL device of the fourth embodiment, the light emitting layer includes a first compound and a second compound. The first compound in the light emitting layer is preferably the compound according to the first embodiment or the second embodiment. In this embodiment, the first compound is preferably a host material (sometimes referred to as a matrix material), and the second compound is preferably a dopant material (sometimes referred to as a guest material, emitter, or luminescent material). ) is also preferable.
In the fourth embodiment, when the light-emitting layer contains the compound according to the first embodiment or the second embodiment, the light-emitting layer preferably does not contain a phosphorescent metal complex, and other than a phosphorescent metal complex. Preferably, the metal complex does not contain any metal complexes.

(first compound)
The first compound is a compound according to the first embodiment or the second embodiment. The first compound of the fourth embodiment is preferably a thermally activated delayed fluorescent compound.

(Second compound)
The second compound is preferably a fluorescent compound. The second compound is preferably a compound that does not exhibit heat-activated delayed fluorescence.
The second compound of the fourth embodiment is not a phosphorescent metal complex. Preferably, the second compound is not a heavy metal complex. Moreover, it is preferable that the second compound is not a metal complex.

A fluorescent material can be used as the second compound in the fourth embodiment. Specific examples of the fluorescent material include bisarylaminonaphthalene derivatives, aryl-substituted naphthalene derivatives, bisarylaminoanthracene derivatives, aryl-substituted anthracene derivatives, bisarylaminopyrene derivatives, aryl-substituted pyrene derivatives, and bisarylaminopyrene derivatives. Chrysene derivatives, aryl-substituted chrysene derivatives, bisarylaminofluoranthene derivatives, aryl-substituted fluoranthene derivatives, indenoperylene derivatives, acenaphthofluoranthene derivatives, compounds containing a boron atom, pyrromethene boron complex compounds, compounds having a pyrromethene skeleton, Examples include metal complexes of compounds having a pyrromethene skeleton, diketopyrrolopyrrole derivatives, perylene derivatives, and naphthacene derivatives.

The second compound is preferably a compound that emits light with a maximum peak wavelength of 400 nm or more and 700 nm or less.
In this specification, the maximum peak wavelength refers to the maximum emission intensity in the measured fluorescence spectrum of a toluene solution in which the target compound is dissolved at a concentration of 10 ^-6 mol/liter or more and 10 ^-5 mol/liter or less. The peak wavelength of the fluorescence spectrum. The measuring device used is a spectrofluorometer (manufactured by Hitachi High-Tech Science Co., Ltd., F-7000).

Preferably, the second compound emits red or green light.
In this specification, red light emission refers to light emission in which the maximum peak wavelength of the fluorescence spectrum is within the range of 600 nm or more and 660 nm or less.
When the second compound is a red fluorescent compound, the maximum peak wavelength of the second compound is preferably 600 nm or more and 660 nm or less, more preferably 600 nm or more and 640 nm or less, and even more preferably 610 nm or more and 630 nm or less. .
In this specification, green light emission refers to light emission in which the maximum peak wavelength of the fluorescence spectrum is within the range of 500 nm or more and 560 nm or less.
When the second compound is a green fluorescent compound, the maximum peak wavelength of the second compound is preferably 500 nm or more and 560 nm or less, more preferably 500 nm or more and 540 nm or less, and even more preferably 510 nm or more and 540 nm or less. .
In this specification, blue light emission refers to light emission in which the maximum peak wavelength of the fluorescence spectrum is within the range of 430 nm or more and 480 nm or less.
When the second compound is a blue fluorescent compound, the maximum peak wavelength of the second compound is preferably 430 nm or more and 480 nm or less, more preferably 440 nm or more and 480 nm or less.

The maximum peak wavelength of light emitted from an organic EL element is measured as follows.
A spectral radiance spectrum is measured with a spectral radiance meter CS-2000 (manufactured by Konica Minolta) when a voltage is applied to the organic EL element so that the current density is 10 mA/cm ² .
In the obtained spectral radiance spectrum, the peak wavelength of the emission spectrum at which the emission intensity becomes maximum is measured, and this is defined as the maximum peak wavelength (unit: nm).

(Compound represented by general formula (D1))
In the fourth embodiment, it is also preferable that the second compound is a compound represented by the following general formula (D1).

(In the general formula (D1),
Ring Ax, ring Bx, ring Dx, ring Ex, and ring Fx are each independently,
A ring structure selected from the group consisting of a substituted or unsubstituted aryl ring having 6 to 30 ring atoms, and a substituted or unsubstituted heterocycle having 5 to 30 ring atoms,
One of ring Bx and ring Dx is present, or both ring Bx and ring Dx are present,
When both ring Bx and ring Dx exist, ring Bx and ring Dx share a bond connecting Zc and Zh,
One of ring Ex and ring Fx is present, or both ring Ex and ring Fx are present,
When both ring Ex and ring Fx exist, ring Ex and ring Fx share a bond connecting Zf and Zi,
Za is a nitrogen atom or a carbon atom,
Zb is
When ring Bx is present, it is a nitrogen atom or a carbon atom,
When ring Bx is absent, it is an oxygen atom, a sulfur atom, NRb, C(Rb ₁ )(Rb ₂ ) or Si(Rb ₃ )(Rb ₄ ),
Zc is a nitrogen atom or a carbon atom,
Zd is
When ring Dx is present, it is a nitrogen atom or a carbon atom,
When ring Dx is absent, it is an oxygen atom, a sulfur atom or NRd,
Ze is
When ring Ex is present, it is a nitrogen atom or a carbon atom,
When the ring Ex is absent, it is an oxygen atom, a sulfur atom or NRe,
Zf is a nitrogen atom or a carbon atom,
Zg is
When ring Fx is present, it is a nitrogen atom or a carbon atom,
When the ring Fx is absent, it is an oxygen atom, a sulfur atom, NRg, C(Rg ₁ )(Rg ₂ ) or Si(Rg ₃ )(Rg ₄ ),
Zh is a nitrogen atom or a carbon atom,
Zi is a nitrogen atom or a carbon atom,
Y is a boron atom, a phosphorus atom, SiRh, P=O or P=S,
Rb, Rb ₁ , Rb ₂ , Rb ₃ , Rb ₄ , Rd, Re, Rg, Rg ₁ , Rg ₂ , Rg ₃ , Rg ₄ and Rh are each independently a hydrogen atom or a substituent,
Rb, Rb ₁ , Rb ₂ , Rb ₃ , Rb ₄ , Rd, Re, Rg, Rg ₁ , Rg ₂ , Rg ₃ , Rg ₄ and Rh as substituents are each independently,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
A group represented by -Si(R ₉₁₁ )(R ₉₁₂ )(R ₉₁₃ ),
A group represented by -O-(R ₉₁₄ ),
A group represented by -S-(R ₉₁₅ ) or a group represented by -N(R ₉₁₆ )(R ₉₁₇ ),
However, the bond between Y and Za, the bond between Y and Zd, and the bond between Y and Ze are all single bonds. )

In the second compound, the bond between Y and Za, the bond between Y and Zd, and the bond between Y and Ze are all single bonds, and this single bond is a covalent bond, and a coordinate bond is do not have.

In this specification, the heterocycle includes, for example, a ring structure (heterocycle) obtained by removing a bond from the "heterocyclic group" exemplified in the above-mentioned "substituent described herein". These heterocycles may have a substituent or may be unsubstituted.
In this specification, examples of the aryl ring include a ring structure (aryl ring) obtained by removing the bond from the "aryl group" exemplified in the above-mentioned "substituent described herein". These aryl rings may have a substituent or may be unsubstituted.

(Compound represented by general formula (D11))
In the organic EL device according to the fourth embodiment, it is also preferable that the second compound is a compound represented by the following general formula (D11). The compound represented by the general formula (D1) is also preferably a compound represented by the following general formula (D11).

(In the general formula (D11),
Ring Ax, ring Dx and ring Ex are each independently,
A ring structure selected from the group consisting of a substituted or unsubstituted aryl ring having 6 to 30 ring atoms, and a substituted or unsubstituted heterocycle having 5 to 30 ring atoms,
Za is a nitrogen atom or a carbon atom,
Zb is an oxygen atom, a sulfur atom, NRb, C(Rb ₁ )(Rb ₂ ) or Si(Rb ₃ )(Rb ₄ ),
Zc is a nitrogen atom or a carbon atom,
Zd is a nitrogen atom or a carbon atom,
Ze is a nitrogen atom or a carbon atom,
Zf is a nitrogen atom or a carbon atom,
Zg is an oxygen atom, a sulfur atom, NRg, C(Rg ₁ )(Rg ₂ ) or Si(Rg ₃ )(Rg ₄ ),
Zh is a nitrogen atom or a carbon atom,
Zi is a nitrogen atom or a carbon atom,
Y is a boron atom, a phosphorus atom, SiRh, P=O or P=S,
Rb, Rb ₁ , Rb ₂ , Rb ₃ , Rb ₄ , Rg, Rg _{1 , Rg 2} _, Rg ₃ , Rg ₄ and Rh each independently represent Rb, Rb ₁ , Rb ₂ in the general formula (D1), It has the same meaning as Rb ₃ , Rb ₄ , Rg, Rg ₁ , Rg ₂ , Rg ₃ , Rg ₄ and Rh. )

(Compound represented by general formula (D10))
In the organic EL device according to the fourth embodiment, it is also preferable that the second compound is a compound represented by the following general formula (D10). The compound represented by the general formula (D1) is also preferably a compound represented by the following general formula (D10).

(In the general formula (D10),
X ₁ is CR ₁ or a nitrogen atom,
X ₂ is CR ₂ or a nitrogen atom,
X ₃ is CR ₃ or a nitrogen atom,
X ₄ is CR ₄ or a nitrogen atom,
X ₅ is CR ₅ or a nitrogen atom,
X ₆ is CR ₆ or a nitrogen atom,
X ₇ is CR ₇ , a nitrogen atom, or a carbon atom bonded to X ₈ with a single bond,
X ₈ is CR ₈ , a nitrogen atom, or a carbon atom bonded to X ₇ with a single bond,
X ₉ is CR ₉ or a nitrogen atom,
X ₁₀ is CR ₁₀ or a nitrogen atom,
X ₁₁ is CR ₁₁ or a nitrogen atom,
X ₁₂ is CR ₁₂ or a nitrogen atom,
Q is CR _Q or a nitrogen atom,
Y is NR _Y1 , an oxygen atom, a sulfur atom, C(R _Y2 )(R _Y3 ) or Si(R _Y4 )(R _Y5 ),
One or more sets of adjacent two or more of R ₁ to R ₆ and R ₉ to R ₁₁ are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
One or more of the sets consisting of two or more adjacent ones of R _3, R ₄ and R _Y1 ,
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
At least one hydrogen in a monocyclic ring or a condensed ring formed by bonding one or more of a group consisting of two or more adjacent ones of R _{3 ,} R ₄ and R _Y1 to each other is
an alkyl group having 1 to 50 carbon atoms,
an aryl group having 6 to 50 ring carbon atoms;
a heterocyclic group having 5 to 50 ring atoms;
is substituted with at least one substituent selected from the group consisting of a group represented by -O-(R ₉₂₀ ) and a group represented by -N(R ₉₂₁ )(R ₉₂₂ ), or not replaced,
At least one hydrogen in the substituent is substituted with an aryl group having 6 to 50 ring carbon atoms or an alkyl group having 1 to 50 carbon atoms, or is not substituted,
R ₁ to R ₁₁ , R ₁₂ to R ₁₃ , and R _Q that do not form a substituted or unsubstituted monocyclic ring and do not form a substituted or unsubstituted fused ring are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₁₁ )(R ₉₁₂ )(R ₉₁₃ ),
A group represented by -O-(R ₉₁₄ ),
A group represented by -S-(R ₉₁₅ ),
A group represented by -N(R ₉₁₆ )(R ₉₁₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₁₈ ,
- A group represented by COOR ₉₁₉ ,
halogen atom,
cyano group,
nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
R _Y1 that does not form the substituted or unsubstituted monocycle and does not form the substituted or unsubstituted fused ring,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
The set consisting of R _Y2 and R _Y3 is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R _Y2 and R _Y3 that do not form a substituted or unsubstituted monocyclic ring and do not form a substituted or unsubstituted fused ring, and R _Y4 and R _Y5 are each independently,
hydrogen atom,
halogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
A substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms,
R ₉₁₁ to R ₉₂₂ are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
When a plurality of R _911s exist, the plurality of R _911s are the same or different from each other,
When a plurality of R _912s exist, the plurality of R _912s are the same or different from each other,
When a plurality of R _913s exist, the plurality of R _913s are the same or different from each other,
When a plurality of R _914s exist, the plurality of R _914s are the same or different from each other,
When a plurality of R _915s exist, the plurality of R _915s are the same or different from each other,
When a plurality of R _916s exist, the plurality of R _916s are the same or different from each other,
When a plurality of R _917s exist, the plurality of R _917s are the same or different from each other,
When a plurality of R _918s exist, the plurality of R _918s are the same or different from each other,
When a plurality of R _919s exist, the plurality of R _919s are the same or different from each other,
When a plurality of R _920s exist, the plurality of R _920s are the same or different from each other,
When a plurality of R _921s exist, the plurality of R _921s are the same or different from each other,
When a plurality of R _922s exist, the plurality of R _922s are the same or different from each other. )

In the compound represented by the general formula (D10), when X ₇ is a carbon atom that is bonded to X ₈ through a single bond, and X ₈ is a carbon atom that is bonded to X ₇ through a single bond, for example, Formula (D10) is represented by the following general formula (D10A).

(In the general formula (D10A), X ₁ to X ₆ , X ₉ to X ₁₂ , Y, Q, and R ₁₃ are each independently as defined in the general formula (1).)

The compound represented by the general formula (D10) is also preferably represented by the following general formula (D12).

(In the general formula (D12), R ₁ to R ₁₃ , R _Y1 , and R _Q are each independently as defined in the general formula (D10).)

The compound represented by the general formula (D10) is also preferably represented by the following general formula (D12A).

(In the general formula (D12A), R ₁ to R ₆ , R ₉ to R ₁₃ , R _Y1 , and R _Q are each independently as defined in the general formula (D10).)

The compound represented by the general formula (D10) is also preferably represented by the following general formula (D13).

(In the general formula (D13),
R ₁ to R ₃ , R ₅ to R ₁₃ and R _Q are each independently as defined in the general formula (D10),
One or more pairs of adjacent two or more of R _x1 to R _x4 are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Each _of _R
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
A group represented by -Si(R ₉₃₁ )(R ₉₃₂ )(R ₉₃₃ ),
A group represented by -O-(R ₉₃₄ ),
A group represented by -S-(R ₉₃₅ ),
A group represented by -N(R ₉₃₆ )(R ₉₃₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₃₈ ,
- A group represented by COOR ₉₃₉ ,
halogen atom,
cyano group,
nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
R ₉₃₁ to R ₉₃₉ are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
When a plurality of R _931s exist, the plurality of R _931s are the same or different from each other,
When a plurality of R _932s exist, the plurality of R _932s are the same or different from each other,
When multiple R _933s exist, the multiple R _933s are the same or different,
When a plurality of R _934s exist, the plurality of R _934s are the same or different from each other,
When a plurality of R _935s exist, the plurality of R _935s are the same or different from each other,
When a plurality of R _936s exist, the plurality of R _936s are the same or different from each other,
When multiple R _937s exist, the multiple R _937s are the same or different,
When a plurality of R _938s exist, the plurality of R _938s are the same or different from each other,
When a plurality of R _939s exist, the plurality of R _939s are the same or different from each other. )

In addition, in the general formula (D13), for example, the set consisting of R ₅ and R ₆ may be bonded to each other to form a substituted or unsubstituted monocycle, or may be bonded to each other to form a substituted or unsubstituted fused ring. do not form a ring or bond to each other.

The compound represented by the general formula (D10) is also preferably represented by the following general formula (D13A).

(In the general formula (D13A), R ₁ to R ₃ , R ₅ to R ₆ , R ₉ to R ₁₃ and R _Q are each independently as defined in the general formula (1), and R _x1 ~R _x4 are each independently as defined in the general formula (D13).)

In the compound represented by the general formula (D10), R ₁ to R ₁₃ and R _Q are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is also preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.

In the compound represented by the general formula (D10), R ₁ to R ₁₃ and R _Q are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 25 carbon atoms,
It is also preferably a substituted or unsubstituted aryl group having 6 to 25 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 25 ring atoms.

In the compound represented by the general formula (D10), R ₁ to R ₃ , R ₅ to R ₁₃ , R _Q and R _x1 to R _x4 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is also preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.

In the compound represented by the general formula (D10), R ₁ to R ₃ , R ₅ to R ₁₃ , R _Q and R _x1 to R _x4 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 25 carbon atoms,
It is also preferably a substituted or unsubstituted aryl group having 6 to 25 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 25 ring atoms.

In the compound represented by the general formula (D10), R ₁ to R ₁₃ , R _Q and R _x1 to R _x4 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms.

In the compound represented by the general formula (D10), R ₁ to R ₁₃ , R _Q and R _x1 to R _x4 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 25 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 25 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 25 ring atoms.

The compound represented by the general formula (D10) is also preferably represented by the following general formula (D14).

(In the general formula (D14), R ₂ , R _{6 ,} R _{13 ,} R _Q and R _x2 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 10 carbon atoms,
A substituted or unsubstituted aryl group having 6 to 12 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 18 ring atoms. )

The compound represented by the general formula (D10) is also preferably represented by the following general formula (D15).

(In the general formula (D15), R ₂ , R _{6 ,} R _{13 ,} R _Q and R _x2 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 10 carbon atoms,
A substituted or unsubstituted aryl group having 6 to 12 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 5 to 18 ring atoms. )

In the compound represented by the general formula (D10), R ₁₃ and R _Q are each independently,
Substituted or unsubstituted alkyl group having 1 to 10 carbon atoms,
substituted or unsubstituted phenyl group,
It is preferably a substituted or unsubstituted naphthyl group or a substituted or unsubstituted dibenzofuranyl group.

In the compound represented by the general formula (D10), R ₆ and R _x2 are preferably each independently a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms.

(Compound represented by general formula (D20))
In the organic EL device according to the fourth embodiment, it is also preferable that the second compound is a compound represented by the following general formula (D20).

In the general formula (D20),
X is a nitrogen atom or a carbon atom bonded to Y,
Y is a hydrogen atom or a substituent,
R ₂₁ to R ₂₆ are each independently a hydrogen atom or a substituent, or a set of R ₂₁ and R ₂₂ , a set of R ₂₂ and R ₂₃ , a set of R ₂₄ and R ₂₅ , and a set of R ₂₅ and R Any one or more of the ₂₆ pairs combine with each other to form a ring,
Y as a substituent and R ₂₁ to R ₂₆ are each independently,
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
Substituted or unsubstituted halogenated alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms,
substituted or unsubstituted halogenated alkoxy group having 1 to 30 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms,
Substituted or unsubstituted aralkyl group having 7 to 30 carbon atoms,
a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms;
halogen atom,
carboxy group,
substituted or unsubstituted ester group,
substituted or unsubstituted carbamoyl group,
substituted or unsubstituted amino group,
nitro group,
cyano group,
selected from the group consisting of a substituted or unsubstituted silyl group, and a substituted or unsubstituted siloxanyl group,
Z ₂₁ and Z ₂₂ are each independently a substituent, or Z ₂₁ and Z ₂₂ combine with each other to form a ring,
Z ₂₁ and Z ₂₂ as substituents each independently,
halogen atom,
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
Substituted or unsubstituted halogenated alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms,
It is selected from the group consisting of a substituted or unsubstituted halogenated alkoxy group having 1 to 30 carbon atoms, and a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms.

In the second compound according to the fourth embodiment, the substituent in the case of "substituted or unsubstituted" is
unsubstituted alkyl group having 1 to 25 carbon atoms,
unsubstituted alkenyl group having 2 to 25 carbon atoms,
an unsubstituted alkynyl group having 2 to 25 carbon atoms,
an unsubstituted cycloalkyl group having 3 to 25 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
A group represented by -S(=O) ₂ R ₉₄₁ ,
A group represented by -P(=O)(R ₉₄₂ )(R ₉₄₃ ),
-Ge(R ₉₄₄ )(R ₉₄₅ )(R ₉₄₆ ),
halogen atom,
cyano group,
nitro group,
an unsubstituted aryl group having 6 to 25 ring carbon atoms, or an unsubstituted heterocyclic group having 5 to 25 ring atoms;
R ₉₀₁ to R ₉₀₉ and R ₉₄₁ to R ₉₄₆ are each independently,
hydrogen atom,
unsubstituted alkyl group having 1 to 25 carbon atoms,
It is preferably an unsubstituted aryl group having 6 to 25 ring carbon atoms or an unsubstituted heterocyclic group having 5 to 25 ring atoms.

In the second compound according to the fourth embodiment, the substituent in the case of "substituted or unsubstituted" is
halogen atom,
unsubstituted alkyl group having 1 to 25 carbon atoms,
It is preferably an unsubstituted aryl group having 6 to 25 ring carbon atoms or an unsubstituted heterocyclic group having 5 to 25 ring atoms.

In the second compound according to the fourth embodiment, the substituent in the case of "substituted or unsubstituted" is
unsubstituted alkyl group having 1 to 10 carbon atoms,
It is preferably an unsubstituted aryl group having 6 to 12 ring carbon atoms or an unsubstituted heterocyclic group having 5 to 12 ring atoms.

In the second compound according to the fourth embodiment, it is also preferable that all groups described as "substituted or unsubstituted" are "unsubstituted" groups.

(Specific examples of compounds represented by general formula (D1), (D11), (D10) or (D20))
Specific examples of the compound represented by the general formula (D1), (D11), (D10) or (D20) include the following compounds. However, the present invention is not limited to these specific examples.

(Relationship between the first compound and the second compound in the light emitting layer)
In the organic EL device according to the fourth embodiment, the light emitting layer includes a first compound and a second compound, the second compound is a fluorescent compound, and the first compound is a single layer of the first compound. It is preferable that the term energy S ₁ (M1) and the singlet energy S ₁ (M2) of the second compound satisfy the relationship of the following formula (Equation 1).
S ₁ (M1)>S ₁ (M2) ... (Math. 1)

The energy gap T _77K (M1) of the first compound at 77 [K] is preferably larger than the energy gap T _77K (M2) of the second compound at 77 [K]. That is, it is preferable that the relationship of the following mathematical formula (Equation 5) be satisfied.
T _77K (M1)>T _77K (M2)...(Math. 5)

When the organic EL element of the fourth embodiment emits light, it is preferable that the second compound mainly emits light in the light emitting layer.

(TADF mechanism)
FIG. 4 is a diagram showing an example of the relationship between the energy levels of the second compound M2 and the first compound M1 in the light emitting layer. In FIG. 4, S0 represents the ground state. S1 (M1) represents the lowest excited singlet state of the first compound M1. T1 (M1) represents the lowest excited triplet state of the first compound M1. S1(M2) represents the lowest excited singlet state of the second compound M2. T1(M2) represents the lowest excited triplet state of the second compound M2.
The dashed arrow pointing from S1 (M1) to S1 (M2) in FIG. 4 represents Förster type energy transfer from the lowest excited singlet state of the first compound M1 to the second compound M2.
As shown in FIG. 4, when a compound with a small ΔST (M1) is used as the first compound M1, the lowest excited triplet state T1 (M1) is reversed to the lowest excited singlet state S1 (M1) due to thermal energy. Intersystem crossing is possible. Then, a Förster type energy transfer occurs from the lowest excited singlet state S1 (M1) of the first compound M1 to the second compound M2, and the lowest excited singlet state S1 (M2) is generated. As a result, fluorescence emission from the lowest excited singlet state S1 (M2) of the second compound M2 can be observed. It is believed that the internal quantum efficiency can be theoretically increased to 100% by utilizing delayed fluorescence caused by this TADF mechanism.

The organic EL element of the fourth embodiment preferably emits red light or green light.
When the organic EL element of the fourth embodiment emits green light, the maximum peak wavelength of the light emitted from the organic EL element is preferably 500 nm or more and 560 nm or less.
When the organic EL element of the fourth embodiment emits red light, the maximum peak wavelength of the light emitted from the organic EL element is preferably 600 nm or more and 660 nm or less.
When the organic EL element of the fourth embodiment emits blue light, the maximum peak wavelength of the light emitted from the organic EL element is preferably 430 nm or more and 480 nm or less.

(Thickness of light emitting layer)
The thickness of the light emitting layer in the organic EL element of the fourth embodiment is preferably 5 nm or more and 50 nm or less, more preferably 7 nm or more and 50 nm or less, and most preferably 10 nm or more and 50 nm or less. When the thickness is 5 nm or more, it is easy to form a light emitting layer and adjust the chromaticity, and when it is 50 nm or less, an increase in driving voltage is easily suppressed.

(Content of compound in luminescent layer)
It is preferable that the content of the first compound and the second compound contained in the light-emitting layer is, for example, in the following range.
The content of the first compound is preferably 10% by mass or more and 80% by mass or less, more preferably 10% by mass or more and 60% by mass or less, and preferably 20% by mass or more and 60% by mass or less. More preferred. Further, the content of the first compound may be 90% by mass or more and 99.9% by mass or less, 95% by mass or more and 99.9% by mass or less, or 99% by mass or more and 99.9% by mass or less.
The content of the second compound is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.01% by mass or more and 5% by mass or less, and 0.01% by mass or more and 1% by mass. % or less is more preferable.
Note that the fourth embodiment does not exclude that the light-emitting layer includes materials other than the first compound and the second compound.
The light emitting layer may contain only one kind of the first compound, or may contain two or more kinds of the first compound. The light-emitting layer may contain only one type of second compound, or may contain two or more types of the second compound.

(substrate)
The substrate is used as a support for the organic EL element. As the substrate, for example, glass, quartz, plastic, etc. can be used. Alternatively, a flexible substrate may be used. A flexible substrate is a bendable (flexible) substrate, and includes, for example, a plastic substrate made of polycarbonate, polyarylate, polyethersulfone, polypropylene, polyester, polyvinyl fluoride, polyvinyl chloride, etc. . Moreover, an inorganic vapor-deposited film can also be used.

(anode)
For the anode formed on the substrate, it is preferable to use a metal, an alloy, an electrically conductive compound, a mixture thereof, or the like having a large work function (specifically, 4.0 eV or more). Specifically, for example, indium oxide-tin oxide (ITO), indium oxide-tin oxide containing silicon or silicon oxide, indium oxide-zinc oxide, tungsten oxide, and indium oxide containing zinc oxide. , graphene, etc. In addition, gold (Au), platinum (Pt), nickel (Ni), tungsten (W), chromium (Cr), molybdenum (Mo), iron (Fe), cobalt (Co), copper (Cu), palladium ( Pd), titanium (Ti), or a nitride of a metal material (eg, titanium nitride).
These materials are usually formed into films by sputtering. For example, indium oxide-zinc oxide can be formed by a sputtering method by using a target containing 1% by mass or more and 10% by mass or less of zinc oxide relative to indium oxide. Furthermore, for example, indium oxide containing tungsten oxide and zinc oxide contains 0.5% by mass or more of tungsten oxide and 5% by mass or less, and 0.1% by mass or more and 1% by mass or less of zinc oxide relative to indium oxide. By using a target, it can be formed by a sputtering method. In addition, it may be produced by a vacuum evaporation method, a coating method, an inkjet method, a spin coating method, or the like.
Among the EL layers formed on the anode, the hole injection layer formed in contact with the anode is formed using a composite material that allows easy hole injection regardless of the work function of the anode. , materials that can be used as electrode materials (for example, metals, alloys, electrically conductive compounds, mixtures thereof, and other elements belonging to Group 1 or Group 2 of the Periodic Table of Elements) can be used.
Elements belonging to Group 1 or Group 2 of the periodic table of elements, which are materials with a small work function, such as alkali metals such as lithium (Li) and cesium (Cs), as well as magnesium (Mg), calcium (Ca), and strontium. Alkaline earth metals such as (Sr), alloys containing these (for example, MgAg, AlLi), rare earth metals such as europium (Eu), ytterbium (Yb), alloys containing these, etc. can also be used. In addition, when forming an anode using an alkali metal, an alkaline earth metal, or an alloy containing these, a vacuum evaporation method or a sputtering method can be used. Furthermore, when silver paste or the like is used, a coating method, an inkjet method, etc. can be used.

(cathode)
For the cathode, it is preferable to use a metal, an alloy, an electrically conductive compound, a mixture thereof, or the like having a small work function (specifically, 3.8 eV or less). Specific examples of such cathode materials include elements belonging to Group 1 or Group 2 of the periodic table of elements, that is, alkali metals such as lithium (Li) and cesium (Cs), and magnesium (Mg) and calcium (Ca). ), alkaline earth metals such as strontium (Sr), alloys containing these (for example, MgAg, AlLi), rare earth metals such as europium (Eu), ytterbium (Yb), and alloys containing these.
In addition, when forming a cathode using an alkali metal, an alkaline earth metal, or an alloy containing these, a vacuum evaporation method or a sputtering method can be used. Furthermore, when using silver paste or the like, a coating method, an inkjet method, etc. can be used.
By providing an electron injection layer, the cathode can be formed using various conductive materials such as Al, Ag, ITO, graphene, silicon, or indium oxide-tin oxide containing silicon oxide, regardless of the size of the work function. can do. These conductive materials can be formed into films using a sputtering method, an inkjet method, a spin coating method, or the like.

(hole injection layer)
The hole injection layer is a layer containing a substance with high hole injection properties. Substances with high hole injection properties include molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, Tungsten oxide, manganese oxide, etc. can be used.
In addition, as substances with high hole injection properties, 4,4',4''-tris(N,N-diphenylamino)triphenylamine (abbreviation: TDATA), 4,4' , 4''-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (abbreviation: MTDATA), 4,4'-bis[N-(4-diphenylaminophenyl)-N-phenyl amino]biphenyl (abbreviation: DPAB), 4,4'-bis(N-{4-[N'-(3-methylphenyl)-N'-phenylamino]phenyl}-N-phenylamino)biphenyl (abbreviation: DNTPD), 1,3,5-tris[N-(4-diphenylaminophenyl)-N-phenylamino]benzene (abbreviation: DPA3B), 3-[N-(9-phenylcarbazol-3-yl)-N -phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA1), 3,6-bis[N-(9-phenylcarbazol-3-yl)-N-phenylamino]-9-phenylcarbazole (abbreviation: PCzPCA2), Also included are aromatic amine compounds such as 3-[N-(1-naphthyl)-N-(9-phenylcarbazol-3-yl)amino]-9-phenylcarbazole (abbreviation: PCzPCN1).
Moreover, as a substance with high hole injection property, a high molecular compound (oligomer, dendrimer, polymer, etc.) can also be used. For example, poly(N-vinylcarbazole) (abbreviation: PVK), poly(4-vinyltriphenylamine) (abbreviation: PVTPA), poly[N-(4-{N'-[4-(4-diphenylamino) phenyl]phenyl-N'-phenylamino}phenyl) methacrylamide] (abbreviation: PTPDMA), poly[N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine] (abbreviation: Polymer compounds such as Poly-TPD) can be mentioned. Additionally, a polymer compound to which an acid is added, such as poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT/PSS) or polyaniline/poly(styrene sulfonic acid) (PAni/PSS), is used. You can also do that.

(hole transport layer)
The hole transport layer is a layer containing a substance with high hole transport properties. For the hole transport layer, aromatic amine compounds, carbazole derivatives, anthracene derivatives, etc. can be used. Specifically, 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (abbreviation: NPB) and N,N'-bis(3-methylphenyl)-N,N'- Diphenyl-[1,1'-biphenyl]-4,4'-diamine (abbreviation: TPD), 4-phenyl-4'-(9-phenylfluoren-9-yl)triphenylamine (abbreviation: BAFLP), 4 , 4'-bis[N-(9,9-dimethylfluoren-2-yl)-N-phenylamino]biphenyl (abbreviation: DFLDPBi), 4,4',4''-tris(N,N-diphenylamino) ) triphenylamine (abbreviation: TDATA), 4,4',4''-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (abbreviation: MTDATA), 4,4'-bis Aromatic amine compounds such as [N-(spiro-9,9'-bifluoren-2-yl)-N-phenylamino]biphenyl (abbreviation: BSPB) can be used. The substances described here mainly have a hole mobility of 10-6 cm2/Vs or more.
For the hole transport layer, carbazole derivatives such as CBP, CzPA, and PCzPA, and anthracene derivatives such as t-BuDNA, DNA, and DPAnth may be used. Polymer compounds such as poly(N-vinylcarbazole) (abbreviation: PVK) and poly(4-vinyltriphenylamine) (abbreviation: PVTPA) can also be used.
However, any material other than these may be used as long as it has a higher transportability for holes than for electrons. Note that the layer containing a substance with high hole transport properties may be a single layer or a layer in which two or more layers made of the above substance are laminated.

(electron transport layer)
The electron transport layer is a layer containing a substance with high electron transport properties. The electron transport layer contains 1) metal complexes such as aluminum complexes, beryllium complexes, and zinc complexes, 2) heteroaromatic compounds such as imidazole derivatives, benzimidazole derivatives, azine derivatives, carbazole derivatives, and phenanthroline derivatives, and 3) polymer compounds. can be used. Specifically, low-molecular organic compounds include Alq, tris(4-methyl-8-quinolinolato)aluminum (abbreviation: Almq ₃ ), bis(10-hydroxybenzo[h]quinolinato) beryllium (abbreviation: BeBq ₂ ), Metal complexes such as BAlq, Znq, ZnPBO, ZnBTZ, etc. can be used. In addition to metal complexes, 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (abbreviation: PBD), 1,3-bis[5- (ptert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene (abbreviation: OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4- biphenylyl)-1,2,4-triazole (abbreviation: TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4- Complex compounds such as triazole (abbreviation: p-EtTAZ), bathophenanthroline (abbreviation: BPhen), bathocuproine (abbreviation: BCP), and 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (abbreviation: BzOs) Aromatic compounds can also be used. The substances mentioned here mainly have an electron mobility of 10 ⁻⁶ cm ² /Vs or more. Note that any material other than the above may be used as the electron transport layer, as long as it has a higher electron transport property than hole transport property. Further, the electron transport layer may be a single layer or a layer in which two or more layers made of the above substances are laminated.
Moreover, a polymer compound can also be used for the electron transport layer. For example, poly[(9,9-dihexylfluorene-2,7-diyl)-co-(pyridine-3,5-diyl)] (abbreviation: PF-Py), poly[(9,9-dioctylfluorene-2, ,7-diyl)-co-(2,2'-bipyridine-6,6'-diyl)] (abbreviation: PF-BPy), etc. can be used.

(electron injection layer)
The electron injection layer is a layer containing a substance with high electron injection properties. The electron injection layer contains lithium (Li), cesium (Cs), calcium (Ca), lithium fluoride (LiF), cesium fluoride (CsF), calcium fluoride (CaF ₂ ), lithium oxide (LiOx), etc. Alkali metals, alkaline earth metals, or compounds thereof can be used. In addition, a material containing an alkali metal, an alkaline earth metal, or a compound thereof in a substance having electron transport properties, specifically, a material containing magnesium (Mg) in Alq, etc. may be used. Note that in this case, electron injection from the cathode can be performed more efficiently.
Alternatively, a composite material made of a mixture of an organic compound and an electron donor may be used for the electron injection layer. Such a composite material has excellent electron injection and electron transport properties because electrons are generated in the organic compound by the electron donor. In this case, the organic compound is preferably a material that is excellent in transporting generated electrons, and specifically, for example, the above-mentioned substances (metal complexes, heteroaromatic compounds, etc.) constituting the electron transport layer are used. be able to. The electron donor may be any substance that exhibits electron-donating properties to organic compounds. Specifically, alkali metals, alkaline earth metals, and rare earth metals are preferred, and examples include lithium, cesium, magnesium, calcium, erbium, and ytterbium. Moreover, alkali metal oxides and alkaline earth metal oxides are preferable, and examples thereof include lithium oxide, calcium oxide, barium oxide, and the like. Additionally, Lewis bases such as magnesium oxide can also be used. Moreover, organic compounds such as tetrathiafulvalene (abbreviation: TTF) can also be used.

(Layer formation method)
Methods for forming each layer of the organic EL element of the fourth embodiment are not limited to those specifically mentioned above, but include dry film forming methods such as vacuum evaporation, sputtering, plasma, and ion plating, Known methods such as wet film forming methods such as spin coating method, dipping method, flow coating method, and inkjet method can be employed.

(film thickness)
The film thickness of each organic layer of the organic EL element of the fourth embodiment is not limited except as specifically mentioned above, but in general, if the film thickness is too thin, defects such as pinholes are likely to occur; Since a high applied voltage is required and efficiency deteriorates, the range of from several nm to 1 μm is usually preferable.

The organic EL device according to the fourth embodiment includes, in the light-emitting layer, the compound according to the first embodiment or the second embodiment as a first compound, and a second compound having a lowest excited singlet energy smaller than that of the first compound. It contains two compounds.
Since the organic EL device according to the fourth embodiment includes the compound (first compound) according to the first embodiment, the luminous efficiency of the organic EL device can be improved according to the fourth embodiment.
Since the organic EL device according to the fourth embodiment includes the compound (first compound) according to the second embodiment, the life of the organic EL device can be improved according to the fourth embodiment.
The organic EL element according to the fourth embodiment can be used in electronic devices such as display devices and light emitting devices.

[Fifth embodiment]
The configuration of the organic EL element according to the fifth embodiment will be described. In the description of the fifth embodiment, the same components as those in the fourth embodiment are given the same reference numerals and names, and the description is omitted or simplified. Furthermore, in the fifth embodiment, for materials and compounds not specifically mentioned, the same materials and compounds as those described in the fourth embodiment can be used.

The organic EL device according to the fifth embodiment differs from the organic EL device according to the fourth embodiment in that the light emitting layer further contains a third compound. Other points are similar to the fourth embodiment.
That is, in the fifth embodiment, the light emitting layer includes a first compound, a second compound, and a third compound.
In this embodiment, the first compound is preferably a host material and the second compound is preferably a dopant material.

(Third compound)
In the light emitting layer of the organic EL device of the fifth embodiment, the third compound may be a thermally activated delayed fluorescent compound or a compound that does not exhibit thermally activated delayed fluorescent property; It is preferable that the compound exhibits no.

The third compound is not particularly limited, but is preferably a compound other than an amine compound. Further, for example, as the third compound, a carbazole derivative, a dibenzofuran derivative, or a dibenzothiophene derivative can be used, but the present invention is not limited to these derivatives.

(Compound represented by general formula (3))
In the light emitting layer of the organic EL device of the fifth embodiment, it is also preferable that the third compound is a compound represented by the following general formula (3).

(In the general formula (3),
_A3 is
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
_L3 is
single bond,
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms,
Substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
Two groups selected from the group consisting of a substituted or unsubstituted arylene group having 6 to 50 ring atoms and a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms are bonded together. selected from the group consisting of a substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms and a substituted or unsubstituted divalent heterocyclic group having 5 to 30 ring atoms; is a divalent group formed by combining three groups,
One or more sets of two or more adjacent ones of R ₃₁ to R ₃₈ are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₁ to R ₃₈ which do not form a substituted or unsubstituted monocyclic ring and which do not form a substituted or unsubstituted fused ring are each independently:
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
halogen atom,
cyano group,
nitro group,
A group represented by -P(=O)(R ₉₃₁ )(R ₉₃₂ ),
-Ge(R ₉₃₃ )(R ₉₃₄ )(R ₉₃₅ ),
A group represented by -B(R ₉₃₆ )(R ₉₃₇ ),
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
A substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the following general formula (3A). )

(In the general formula (3A),
_RB is
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
halogen atom,
cyano group,
nitro group,
A group represented by -P(=O)(R ₉₃₁ )(R ₉₃₂ ),
-Ge(R ₉₃₃ )(R ₉₃₄ )(R ₉₃₅ ),
A group represented by -B(R ₉₃₆ )(R ₉₃₇ ),
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
When a plurality of _RBs exist, the plurality of _RBs are the same or different from each other,
L ₃₁ is
single bond,
A substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, a trivalent group, a tetravalent group, a pentavalent group or a hexavalent group derived from the arylene group,
A substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms, a trivalent group, a tetravalent group, a pentavalent group, or a hexavalent group derived from the heterocyclic group, or Two groups selected from the group consisting of a substituted or unsubstituted arylene group having 6 to 50 ring atoms and a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms are bonded together. A divalent group formed, a trivalent group, a tetravalent group, a pentavalent group or a hexavalent group derived from the divalent group,
L ₃₂ is
single bond,
A substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms,
n ₃ is 1, 2, 3, 4 or 5;
When L ₃₁ is a single bond, n ₃ is 1, and L ₃₂ is bonded to the carbon atom of the six-membered ring in the general formula (3),
When a plurality of L _32s exist, the plurality of L _32s are the same or different from each other,
* is a bonding site with a carbon atom of a six-membered ring in the general formula (3). )

(In the compound represented by the general formula (3), R ₉₀₁ , R ₉₀₂ , R _{903 , R 904} , R ₉₀₅ , R ₉₀₆ , R ₉₀₇ , R ₉₀₈ , R ₉₀₉ , R ₉₃₁ , _{R 932} _, R ₉₃₃ , R ₉₃₄ , R ₉₃₅ , R ₉₃₆ and R ₉₃₇ are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
When a plurality of R _901s exist, the plurality of R _901s are the same or different from each other,
When a plurality of R _902s exist, the plurality of R _902s are the same or different from each other,
When a plurality of R _903s exist, the plurality of R _903s are the same or different from each other,
When a plurality of R _904s exist, the plurality of R _904s are the same or different from each other,
When a plurality of R _905s exist, the plurality of R _905s are the same or different from each other,
When a plurality of R _906s exist, the plurality of R _906s are the same or different from each other,
When a plurality of R _907s exist, the plurality of R _907s are the same or different from each other,
When a plurality of R _908s exist, the plurality of R _908s are the same or different from each other,
When a plurality of R _909s exist, the plurality of R _909s are the same or different from each other,
When a plurality of R _931s exist, the plurality of R _931s are the same or different from each other,
When a plurality of R _932s exist, the plurality of R _932s are the same or different from each other,
When multiple R _933s exist, the multiple R _933s are the same or different,
When a plurality of R _934s exist, the plurality of R _934s are the same or different from each other,
When a plurality of R _935s exist, the plurality of R _935s are the same or different from each other,
When a plurality of R _936s exist, the plurality of R _936s are the same or different from each other,
When a plurality of R _937s exist, the plurality of R _937s are the same or different from each other. )

The compound represented by the general formula (3) is also preferably a compound represented by any of the following general formulas (31) to (36).

(In the general formulas (31) to (36),
A ₃ and L ₃ are respectively synonymous with A ₃ and L ₃ in the general formula (3),
One or more sets of two or more adjacent ones of R ₃₄₁ to R ₃₅₀ are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
X ₃₁ is a sulfur atom, an oxygen atom, NR ₃₅₂ or CR ₃₅₃ R ₃₅₄ ,
The set consisting of R ₃₅₃ and R ₃₅₄ is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₄₁ to R ₃₅₀ that do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted condensed ring, and R ₃₅₂ do not form the substituted or unsubstituted monocycle, And R ₃₅₃ and R ₃₅₄ , which do not form a substituted or unsubstituted condensed ring, each independently do not form the substituted or unsubstituted monocycle, and do not form the substituted or unsubstituted condensed ring. It has the same meaning as R ₃₁ to R ₃₈ that do not. )

In the compound represented by the general formula (3), R ₃₅₂ is
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (3), the group consisting of R ₃₅₃ and R ₃₅₄ is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₅₃ and R ₃₅₄ which do not form a substituted or unsubstituted monocyclic ring and which do not form a substituted or unsubstituted fused ring are each independently:
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (3), X ₃₁ is preferably a sulfur atom or an oxygen atom.

In the compound represented by the general formula (3), A ₃ is preferably a group represented by any one of the following general formulas (A31) to (A37).

(In the general formulas (A31) to (A37),
One or more sets of two or more adjacent ones of the plurality of R ₃₀₀ ,
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₀₀ and R ₃₃₃ , which do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted fused ring, each independently do not form a substituted or unsubstituted monocycle. , and has the same meaning as R ₃₁ to R ₃₈ that do not form a substituted or unsubstituted fused ring,
* in the above general formulas (A31) to (A37) respectively indicates the bonding position with L ₃ of the compound represented by the above general formula (3). )

In the compound represented by the general formula (3), A ₃ is also preferably a group represented by the general formula (A34), (A35) or (A37).

The compound represented by the general formula (3) is also preferably a compound represented by any of the following general formulas (311) to (316).

(In the general formulas (311) to (316),
L ₃ has the same meaning as L ₃ in the general formula (3),
One or more sets of two or more adjacent ones of the plurality of R ₃₀₀ ,
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
One or more sets of two or more adjacent ones of R ₃₄₁ to R ₃₅₀ are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R 300 which does not form the substituted or unsubstituted monocycle and does not form the substituted or unsubstituted fused ring, and R ₃₀₀ which does not form the substituted or unsubstituted monocycle and the substituted or unsubstituted ring; R ₃₄₁ to R ₃₅₀ that do not form a substituted condensed ring are each independently R ₃₁ to R ₃₈ that do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted condensed ring. are synonymous. )

The compound represented by the general formula (3) is also preferably a compound represented by the following general formula (321).

(In the general formula (321),
L ₃ has the same meaning as L ₃ in the general formula (3),
R ₃₁ to R ₃₈ and R ₃₀₁ to R ₃₀₈ are each independently R ₃₁ to R ₃₈ that do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted fused ring. are synonymous. )

In the compound represented by the general formula (3), L ₃ is preferably a single bond or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (3), L ₃ is
single bond,
substituted or unsubstituted phenylene group,
It is preferably a substituted or unsubstituted biphenylene group or a substituted or unsubstituted terphenylene group.

In the compound represented by the general formula (3), L ₃ is preferably a group represented by the following general formula (317).

(In the general formula (317),
R ₃₁₀ each independently has the same meaning as R ₃₁ to R ₃₈ that do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted condensed ring, and * each independently , indicates the bond position. )

In the compound represented by the general formula (3), L ₃ preferably includes a divalent group represented by the following general formula (318) or general formula (319).
In the compound represented by the general formula (3), L ₃ is also preferably a divalent group represented by the following general formula (318) or general formula (319).

The compound represented by the general formula (3) is also preferably a compound represented by the following general formula (322) or general formula (323).

(In the general formula (322) and general formula (323),
L ₃₁ is
a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms,
A substituted or unsubstituted divalent heterocyclic group having 5 to 50 ring atoms, or a substituted or unsubstituted arylene group having 6 to 50 ring atoms, and a substituted or unsubstituted arylene group having 5 to 50 ring atoms. A divalent group formed by bonding two groups selected from the group consisting of divalent heterocyclic groups,
However, L ₃₁ includes a divalent group represented by the following general formula (318) or general formula (319),
R ₃₁ to R ₃₈ , R ₃₀₀ , and R ₃₂₁ to R ₃₂₈ _each independently do not form the substituted or unsubstituted monocycle, and do not form the substituted or unsubstituted fused ring. Synonymous with _R38 . )

(In the general formula (319),
A set of two adjacent R _304s bond to each other to form a ring represented by the general formula (320),
In the general formula (320), 1* and 2* each independently indicate the bonding position with the ring to which R ₃₀₄ is bonded,
R ₃₀₂ in the general formula (318), R ₃₀₃ in the general formula (318), R ₃₀₃ in the general formula (319), R ₃₀₄ that does not form a ring represented by the general formula (320), and the general R ₃₀₅ in formula (320) each independently has the same meaning as R ₃₁ to R ₃₈ that do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted condensed ring,
* in the general formulas (318) to (320) each indicates a bonding position. )

In the compound represented by the general formula (3), the group represented by the general formula (319) as L ₃ or L ₃₁ is, for example, a group represented by the following general formula (319A).

(In the general formula (319A), R ₃₀₃ , R ₃₀₄ and R ₃₀₅ are each independently R which does not form the substituted or unsubstituted monocycle and does not form the substituted or unsubstituted fused ring. ₃₁ to R ₃₈ , and each * in the general formula (319A) indicates a bonding position.)

It is also preferable that the compound represented by the general formula (3) is a compound represented by the general formula (322), and L ₃₁ is a group represented by the general formula (318).

The compound represented by the general formula (3) is also preferably a compound represented by the following general formula (324).

(In the general formula (324), R ₃₁ to R ₃₈ , R ₃₀₀ , and R ₃₀₂ each independently do not form the substituted or unsubstituted monocycle, and the substituted or unsubstituted fused ring (synonymous with R ₃₁ to R ₃₈ that do not form)

In the compound represented by the general formula (3), R ₃₁ to R ₃₈ that do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted condensed ring are each independently:
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
A substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the general formula (3A),
R _B in the general formula (3A) is,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (3), R ₃₁ to R ₃₈ that do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted condensed ring are each independently:
hydrogen atom,
A substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a group represented by the general formula (3A),
R _B in the general formula (3A) is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (3), R ₃₁ to R ₃₈ that do not form a substituted or unsubstituted monocycle and do not form a substituted or unsubstituted condensed ring are each independently:
hydrogen atom,
A substituted or unsubstituted phenyl group, or a group represented by the general formula (3A),
R _B in the general formula (3A) is preferably a substituted or unsubstituted phenyl group.

It is also preferable that the compound represented by the general formula (3) is a compound that does not have a pyridine ring, a pyrimidine ring, or a triazine ring.

(Compound represented by general formula (MRX3))
In the light emitting layer of the organic EL device of the fifth embodiment, it is also preferable that the third compound is a compound represented by the following general formula (MRX3).

(In the general formula (MRX3),
Y ₃₁ to Y ₃₆ are each independently CR ₃ or a nitrogen atom,
However, two or more of Y ₃₁ to Y ₃₆ are nitrogen atoms,
When a plurality of R _3s exist, one or more of the sets consisting of two or more adjacent ones of the plurality of R _3s are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Each R ₃ that does not form a substituted or unsubstituted monocyclic ring and does not form a substituted or unsubstituted fused ring is independently:
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
halogen atom,
cyano group,
nitro group,
A group represented by -P(=O)(R ₉₃₁ )(R ₉₃₂ ),
-Ge(R ₉₃₃ )(R ₉₃₄ )(R ₉₃₅ ),
A group represented by -B(R ₉₃₆ )(R ₉₃₇ ),
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
A substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the following general formula (MRX3A). )

(In the general formula (MRX3A),
R _B has the same meaning as R _B in the general formula (3),
When a plurality of _RBs exist, the plurality of _RBs are the same or different from each other,
L ₃₁ and L ₃₂ are respectively synonymous with L ₃₁ and L ₃₂ in the general formula (3),
n ₃ is 1, 2, 3, 4 or 5;
When L ₃₁ is a single bond, n ₃ is 1, and L ₃₂ is bonded to the carbon atom of the six-membered ring in the general formula (MRX3),
When a plurality of L _32s exist, the plurality of L _32s are the same or different from each other,
* is a bonding site with a carbon atom of a six-membered ring in the general formula (MRX3). )

The compound represented by the general formula (MRX3) preferably does not contain a pyridine ring in the molecule.

The compound represented by the general formula (MRX3) is also preferably a compound represented by the following general formula (MRX31) or general formula (MRX32).

(In the general formula (MRX32),
One or more pairs of adjacent two or more of R ₃₅ to R ₃₇ are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₁ to R ₃₃ in the general formula (MRX31) and R ₃₄ in the general formula (MRX32) do not form the substituted or unsubstituted monocycle, and do not form the substituted or unsubstituted fused ring. R ₃₅ to R ₃₇ each independently have the same meaning as R ₃ in the general formula (MRX3). )

The compound represented by the general formula (MRX3) is also preferably a compound represented by the general formula (MRX31).

R ₃ in the general formula (MRX3) is each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms,
It is preferably a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms, or a group represented by the above general formula (MRX3A).

R ₃ in the general formula (MRX3) is each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a group represented by the above general formula (MRX3A).

The compound represented by the general formula (MRX3) preferably has at least one group selected from the group consisting of groups represented by the following general formulas (MRXA31) to (MRXA44) in the molecule.

(In the general formulas (MRXA31) to (MRXA38),
One or more sets of two or more adjacent ones of the plurality of R ₃₀₀ ,
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
The set consisting of R ₃₃₁ and R ₃₃₂ is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₀₀ , R 331 , R ₃₃₂ , and _{R 333} _which do not form a substituted or unsubstituted monocyclic ring and do not form a substituted or unsubstituted fused ring are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
halogen atom,
cyano group,
nitro group,
a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms;
* in the general formulas (MRXA31) to (MRXA38) each indicates a bonding position with another atom in the molecule of the compound represented by the general formula (MRX3). )

(In the general formulas (MRXA39) to (MRXA44),
One or more sets of two or more adjacent ones of R ₃₄₁ to R ₃₅₀ are
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
However, at least one of R ₃₄₁ to R ₃₅₁ indicates a bonding position with another atom in the molecule of the compound represented by the general formula (MRX3),
X ₃₁ is a sulfur atom, an oxygen atom, NR ₃₅₂ or CR ₃₅₃ R ₃₅₄ ,
The set consisting of R ₃₅₃ and R ₃₅₄ is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Not at the bonding position with another atom in the molecule of the compound represented by the general formula (MRX3), which does not form the substituted or unsubstituted monocycle, and forms the substituted or unsubstituted fused ring. R ₃₄₁ to R ₃₅₁ that do not form, R 352, and R ₃₅₃ and R ₃₅₄ that do not form the substituted or unsubstituted monocycle and do not form the substituted or unsubstituted fused ring _, each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted haloalkyl group having 1 to 50 carbon atoms,
Substituted or unsubstituted alkenyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted alkynyl group having 2 to 50 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
halogen atom,
cyano group,
nitro group,
A substituted or unsubstituted aryl group having 6 to 50 ring atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms. )

The compound represented by the general formula (MRX3) preferably has at least one group selected from the group consisting of groups represented by the general formulas (MRXA38) to (MRXA44) in the molecule.

In the compound represented by the general formula (MRX3), at least one of Y ₃₁ to Y ₃₆ is CR ₃ ,
It is preferable that at least one R ₃ is a group represented by the general formula (MRX3A), and R _B is any of the groups represented by the general formulas (MRXA31) to (MRXA44).

In the compound represented by the general formula (MRX3), at least one of Y ₃₁ to Y ₃₆ is CR ₃ ,
It is preferable that at least one R ₃ is a group represented by the above general formula (MRX3A), and R _B is any of the groups represented by the above general formulas (MRXA38) to (MRXA44).

In the compound represented by the general formula (MRX3), R ₃₅₂ is
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (MRX3), the group consisting of R ₃₅₃ and R ₃₅₄ is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R ₃₅₃ and R ₃₅₄ which do not form a substituted or unsubstituted monocyclic ring and which do not form a substituted or unsubstituted fused ring are each independently:
Substituted or unsubstituted alkyl group having 1 to 50 carbon atoms,
It is preferably a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), L ₃₁ is
single bond,
A substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms, a trivalent group, a tetravalent group, a pentavalent group, or a hexavalent group derived from the arylene group, or a substituted or unsubstituted ring A divalent group formed by bonding two groups selected from the group consisting of arylene groups having 6 to 50 carbon atoms, a trivalent group, a tetravalent group derived from the divalent group, It is a pentavalent group or a hexavalent group,
L ₃₂ is
It is preferably a single bond or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), L ₃₁ is
A single bond, or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms,
n ₃ is 1,
L ₃₂ is
It is preferably a single bond or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), L ₃₁ is
single bond,
substituted or unsubstituted phenylene group,
A substituted or unsubstituted biphenylene group, or a divalent group formed by combining two groups selected from the group consisting of a substituted or unsubstituted phenylene group and a substituted or unsubstituted biphenylene group; A trivalent group, a tetravalent group, a pentavalent group or a hexavalent group derived from a group,
n ₃ is 1,
L ₃₂ is
single bond,
It is preferably a substituted or unsubstituted phenylene group or a substituted or unsubstituted biphenylene group.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), the substituent in the case of "substituted or unsubstituted" is,
unsubstituted alkyl group having 1 to 25 carbon atoms,
unsubstituted alkenyl group having 2 to 25 carbon atoms,
an unsubstituted alkynyl group having 2 to 25 carbon atoms,
an unsubstituted cycloalkyl group having 3 to 25 ring carbon atoms,
A group represented by -Si(R ₉₀₁ )(R ₉₀₂ )(R ₉₀₃ ),
A group represented by -O-(R ₉₀₄ ),
A group represented by -S-(R ₉₀₅ ),
A group represented by -N(R ₉₀₆ )(R ₉₀₇ ),
unsubstituted aralkyl group having 7 to 50 carbon atoms,
-C(=O)R A group represented by ₉₀₈ ,
- A group represented by COOR ₉₀₉ ,
A group represented by -P(=O)(R ₉₃₁ )(R ₉₃₂ ),
-Ge(R ₉₃₃ )(R ₉₃₄ )(R ₉₃₅ ),
A group represented by -B(R ₉₃₆ )(R ₉₃₇ ),
A group represented by -S(=O) ₂ R ₉₃₈ ,
halogen atom,
cyano group,
nitro group,
an unsubstituted aryl group having 6 to 25 ring carbon atoms, or an unsubstituted heterocyclic group having 5 to 25 ring atoms;
R ₉₀₁ to R ₉₀₉ and R ₉₃₁ to R ₉₃₈ are each independently,
hydrogen atom,
unsubstituted alkyl group having 1 to 25 carbon atoms,
It is preferably an unsubstituted aryl group having 6 to 25 ring carbon atoms or an unsubstituted heterocyclic group having 5 to 25 ring atoms.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), the substituent in the case of "substituted or unsubstituted" is,
halogen atom,
unsubstituted alkyl group having 1 to 25 carbon atoms,
It is preferably an unsubstituted aryl group having 6 to 25 ring carbon atoms or an unsubstituted heterocyclic group having 5 to 25 ring atoms.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), the substituent in the case of "substituted or unsubstituted" is,
unsubstituted alkyl group having 1 to 10 carbon atoms,
It is preferably an unsubstituted aryl group having 6 to 12 ring carbon atoms or an unsubstituted heterocyclic group having 5 to 12 ring atoms.

In the compound represented by the general formula (3) and the compound represented by the general formula (MRX3), any group described as "substituted or unsubstituted" may also be an "unsubstituted" group. preferable.

(Method for producing the third compound)
The third compound according to the fifth embodiment can be produced by a known method.

(Specific example of third compound)
Specific examples of the third compound of this embodiment include the following compounds. However, the present invention is not limited to these specific examples of compounds.

(Relationship among the first compound, second compound, and third compound in the light emitting layer)
In the organic EL device according to the fifth embodiment, the singlet energy S ₁ (M1) of the first compound and the singlet energy S ₁ (M3) of the third compound have the relationship expressed by the following formula (Equation 2). It is preferable to satisfy the following.
S ₁ (M3)>S ₁ (M1)...(Math. 2)

In the organic EL device according to the fifth embodiment, the light emitting layer includes a first compound, a second compound, and a third compound, the second compound is a fluorescent compound, and the light emitting layer includes a first compound, a second compound, and a third compound. The singlet energy S ₁ (M1) of the first compound, the singlet energy S ₁ (M2) of the second compound, and the singlet energy S ₁ (M3) of the third compound are expressed by the following formula (Math. ) is preferably satisfied.
S ₁ (M3)>S ₁ (M1)>S ₁ (M2)...(Math. 3)

The energy gap T _77K (M3) of the third compound at 77 [K] is preferably larger than the energy gap T _77K (M1) of the first compound at 77 [K].
The energy gap T _77K (M3) of the third compound at 77 [K] is preferably larger than the energy gap T _77K (M2) of the second compound at 77 [K].

Energy gap T _77K (M1) at 77[K] of the first compound, energy gap T _77K (M2) at 77[K] of the second compound, and energy gap at 77[K] of the third compound It is preferable that T _77K (M3) satisfies the relationship of the following formula (Equation 2B).
T _77K (M3)>T _77K (M1)>T _77K (M2)...(Math 2B)

When the organic EL element of the fifth embodiment emits light, it is preferable that the fluorescent compound mainly emits light in the light emitting layer.
It is preferable that the organic EL element of the fifth embodiment emits red or green light similarly to the organic EL element of the fourth embodiment.
The maximum peak wavelength of light emitted from the organic EL element can be measured in the same manner as the organic EL element of the fourth embodiment.

(Content of compound in luminescent layer)
The content of the first compound, second compound, and third compound contained in the light-emitting layer is preferably within the following range, for example.
The content of the first compound is preferably 10% by mass or more and 80% by mass or less, more preferably 10% by mass or more and 60% by mass or less, and preferably 20% by mass or more and 60% by mass or less. More preferred.
The content of the second compound is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.01% by mass or more and 5% by mass or less, and 0.01% by mass or more and 1% by mass. % or less is more preferable.
The content of the third compound is preferably 10% by mass or more and 80% by mass or less.
The upper limit of the total content of the first compound, second compound, and third compound in the light emitting layer is 100% by mass. Note that the fifth embodiment does not exclude that the light-emitting layer includes materials other than the first compound, the second compound, and the third compound.
The light emitting layer may contain only one kind of the first compound, or may contain two or more kinds of the first compound. The light-emitting layer may contain only one type of second compound, or may contain two or more types of the second compound. The light-emitting layer may contain only one type of third compound, or may contain two or more types of the third compound.

FIG. 5 is a diagram showing an example of the relationship between the energy levels of the first compound, the second compound, and the third compound in the light emitting layer. In FIG. 5, S0 represents the ground state. S1 (M1) represents the lowest excited singlet state of the first compound, and T1 (M1) represents the lowest excited triplet state of the first compound. S1(M2) represents the lowest excited singlet state of the second compound, and T1(M2) represents the lowest excited triplet state of the second compound. S1 (M3) represents the lowest excited singlet state of the third compound, and T1 (M3) represents the lowest excited triplet state of the third compound. The dashed arrow pointing from S1 (M1) to S1 (M2) in FIG. 5 represents Förster-type energy transfer from the lowest excited singlet state of the first compound to the lowest excited singlet state of the second compound. .
As shown in FIG. 5, when a compound with a small ΔST (M1) is used as the first compound, the lowest excited triplet state T1 (M1) changes to the lowest excited singlet state S1 (M1) due to thermal energy. Intersection is possible. Then, a Förster type energy transfer occurs from the lowest excited singlet state S1 (M1) of the first compound to the second compound, and the lowest excited singlet state S1 (M2) is generated. As a result, fluorescence emission from the lowest excited singlet state S1 (M2) of the second compound can be observed. It is believed that the internal quantum efficiency can be theoretically increased to 100% by utilizing delayed fluorescence due to this TADF mechanism.

The organic EL device according to the fifth embodiment includes, in the light-emitting layer, the compound according to the first embodiment or the second embodiment as a first compound, and a second compound having a lowest excited singlet energy lower than that of the first compound. and a third compound having a higher lowest excited singlet energy than the first compound.
Since the organic EL device according to the fifth embodiment includes the compound (first compound) according to the first embodiment, the luminous efficiency of the organic EL device can be improved according to the fifth embodiment.
Since the organic EL device according to the fifth embodiment includes the compound (first compound) according to the second embodiment, the life of the organic EL device can be improved according to the fifth embodiment.
The organic EL element according to the fifth embodiment can be used in electronic devices such as display devices and light emitting devices.

[Sixth embodiment]
The structure of the organic EL element according to the sixth embodiment will be explained. In the description of the sixth embodiment, the same components as those in the fourth embodiment or the fifth embodiment will be given the same reference numerals or names, and the description will be omitted or simplified. Further, in the sixth embodiment, for materials and compounds not specifically mentioned, the same materials and compounds as those described in the fourth embodiment or the fifth embodiment can be used.

The organic EL device according to the sixth embodiment is the organic EL device according to the fourth embodiment or the fifth embodiment in that the light emitting layer contains the first compound and the third compound and does not contain the second compound. Different from EL elements. The other points are the same as the fourth embodiment or the fifth embodiment.
That is, in the sixth embodiment, the light emitting layer as the first organic layer contains the first compound and the third compound.
In this embodiment, the third compound is preferably a host material and the first compound is preferably a dopant material.
In the sixth embodiment, when the light-emitting layer contains the compound according to the first embodiment or the second embodiment, the light-emitting layer preferably does not contain a phosphorescent metal complex, and other than a phosphorescent metal complex. Preferably, the metal complex does not contain any metal complexes.

<First compound>
The first compound is a compound according to the first embodiment or the second embodiment.
Preferably, the first compound is a thermally activated delayed fluorescent compound.

<Third compound>
The third compound is the same as the third compound described in the fifth embodiment.

(Relationship between the first compound and the third compound in the light emitting layer)
In the organic EL device according to the sixth embodiment, the singlet energy S ₁ (M1) of the first compound and the singlet energy S ₁ (M3) of the third compound have the relationship expressed by the following formula (Equation 2). It is preferable to satisfy the following.
S ₁ (M3)>S ₁ (M1)...(Math. 2)

The energy gap T _77K (M3) of the third compound at 77 [K] is preferably larger than the energy gap T _77K (M1) of the first compound at 77 [K].

FIG. 6 is a diagram for explaining the principle of light emission according to the sixth embodiment of the present invention.
In FIG. 6, S0 represents the ground state. S1 (M1) represents the lowest excited singlet state of the first compound, and T1 (M1) represents the lowest excited triplet state of the first compound. S1 (M3) represents the lowest excited singlet state of the third compound, and T1 (M3) represents the lowest excited triplet state of the third compound.
As shown in FIG. 6, when a compound with a small ΔST (M1) is used as the first compound, the lowest excited triplet state T1 (M1) of the first compound changes due to thermal energy to the lowest excited singlet state S1 ( M1) can undergo inverse intersystem crossing.
By utilizing the reverse intersystem crossing that occurs in the first compound, it is possible to observe, for example, light emission as shown in (i) or (ii) below.
(i) When the emissive layer does not contain a fluorescent dopant having the lowest excited singlet state S1 smaller than the lowest excited singlet state S1 (M1) of the first compound, the lowest excited singlet state S1 of the first compound Light emission from (M1) can be observed.
(ii) The luminescent layer contains a fluorescent dopant in the lowest excited singlet state S1 (in the fourth embodiment or the fifth embodiment, a fluorescent dopant in the lowest excited singlet state S1 (M1) that is smaller than the lowest excited singlet state S1 (M1) of the first compound). compound), emission from the fluorescent dopant can be observed.
Note that in the organic EL element of the sixth embodiment, the light emission shown in (i) above can be observed. In the organic EL element of the fourth embodiment or the fifth embodiment described above, the light emission shown in (ii) above can be observed.

(Content of compound in luminescent layer)
In the organic EL device according to the sixth embodiment, the content of the first compound and the third compound contained in the light emitting layer is preferably in the following range, for example.
The content of the first compound is preferably 10% by mass or more and 90% by mass or less, more preferably 10% by mass or more and 80% by mass or less, and preferably 10% by mass or more and 60% by mass or less. More preferably, it is 20% by mass or more and 60% by mass or less.
The content of the third compound is preferably 10% by mass or more and 90% by mass or less.
The upper limit of the total content of the first compound and the third compound in the light emitting layer is 100% by mass.
In the organic EL device according to the sixth embodiment, the light emitting layer may contain only one kind of the first compound, or may contain two or more kinds of the first compound. The light-emitting layer may contain only one type of third compound, or may contain two or more types of the third compound.

Since the organic EL device according to the sixth embodiment includes the compound (first compound) according to the first embodiment, the luminous efficiency of the organic EL device can be improved according to the sixth embodiment.
Since the organic EL device according to the sixth embodiment includes the compound (first compound) according to the second embodiment, the life of the organic EL device can be improved according to the sixth embodiment.
The organic EL element according to the sixth embodiment can be used in electronic devices such as display devices and light emitting devices.

[Seventh embodiment]
(Electronics)
An electronic device according to a seventh embodiment is equipped with the organic EL element according to any of the embodiments described above. Examples of electronic devices include display devices and light emitting devices. Examples of display devices include display components (eg, organic EL panel modules, etc.), televisions, mobile phones, tablets, personal computers, and the like. Examples of the light emitting device include lighting, vehicle lamps, and the like.

[Changes in embodiment]
Note that the present invention is not limited to the above-described embodiments, and the present invention includes modifications, improvements, and the like within a range that can achieve the object of the present invention.

For example, the number of light emitting layers is not limited to one layer, and a plurality of light emitting layers may be stacked. When an organic EL element has a plurality of light emitting layers, it is sufficient that at least one light emitting layer satisfies the conditions described in the above embodiment. For example, the other light-emitting layer may be a fluorescent-type light-emitting layer or a phosphorescent-type light-emitting layer that utilizes light emission due to electronic transition directly from a triplet excited state to a ground state.
In addition, when the organic EL element has a plurality of light emitting layers, these light emitting layers may be provided adjacent to each other, or a so-called tandem type organic EL element may be provided in which a plurality of light emitting units are stacked with an intermediate layer interposed therebetween. It may also be an EL element.

Further, for example, a barrier layer may be provided adjacent to at least one of the anode side and the cathode side of the light emitting layer. Preferably, the barrier layer is disposed in contact with the light-emitting layer and blocks at least one of holes, electrons, and excitons.
For example, when a barrier layer is placed in contact with the emitting layer on the cathode side, the barrier layer transports electrons and holes reach the layer on the cathode side (e.g., electron transport layer) than the barrier layer. prevent you from doing When the organic EL element includes an electron transport layer, it is preferable to include the barrier layer between the light emitting layer and the electron transport layer.
Furthermore, when a barrier layer is disposed in contact with the light emitting layer on the anode side, the barrier layer transports holes and electrons are transferred to a layer on the anode side (for example, a hole transport layer) than the barrier layer. prevent it from reaching. When the organic EL element includes a hole transport layer, it is preferable to include the barrier layer between the light emitting layer and the hole transport layer.
Furthermore, a barrier layer may be provided adjacent to the light-emitting layer to prevent excitation energy from leaking from the light-emitting layer to its surrounding layers. Excitons generated in the light emitting layer are prevented from moving to layers closer to the electrode than the barrier layer (for example, an electron transport layer, a hole transport layer, etc.).
It is preferable that the light-emitting layer and the barrier layer are bonded to each other.

In addition, the specific structure, shape, etc. in carrying out the present invention may be changed to other structures within the range that can achieve the purpose of the present invention.

Examples according to the present invention will be described below. The present invention is not limited in any way by these Examples.

<Compound>
The structure of the compound represented by the general formula (1) or (1A) used in the production of the organic EL devices according to Examples 1 to 8 is shown below.

The structures of the compounds used in the production of organic EL devices according to Comparative Examples 1 to 6 are shown below.

The structures of other compounds used in the production of organic EL devices according to Examples 1 to 8 and Comparative Examples 1 to 6 are shown below.

<Production of organic EL element>
An organic EL device was produced and evaluated as follows.

(Example 1)
A 25 mm x 75 mm x 1.1 mm thick glass substrate with an ITO transparent electrode (anode) (manufactured by Geomatec Co., Ltd.) was ultrasonically cleaned in isopropyl alcohol for 5 minutes, and then UV ozone cleaned for 1 minute. The ITO film thickness was 130 nm.
The cleaned glass substrate with transparent electrode lines is mounted on a substrate holder of a vacuum evaporation apparatus, and first, compound HT1 and compound HA are coated on the surface on which the transparent electrode lines are formed so as to cover the transparent electrode. A hole injection layer having a thickness of 10 nm was formed by vapor deposition. The concentration of compound HT1 in the hole injection layer was 97% by mass, and the concentration of compound HA was 3% by mass.
Next, a compound HT1 was deposited on this hole injection layer to form a first hole transport layer having a thickness of 110 nm.
Next, a compound HT2 was deposited on the first hole transport layer to form a second hole transport layer with a thickness of 5 nm.
Next, the compound CBP was deposited on this second hole transport layer to form an electron barrier layer with a thickness of 5 nm.
Next, Compound M3-1 as a third compound and Compound A1 as a first compound were co-evaporated onto this electron barrier layer to form a light-emitting layer with a thickness of 25 nm. The concentration of compound M3-1 in the light emitting layer was 50% by mass, and the concentration of compound A1 was 50% by mass.
Next, a compound HBL was deposited on this light emitting layer to form a hole blocking layer with a thickness of 5 nm.
Next, compound ET1 was deposited on this hole blocking layer to form an electron transport layer with a thickness of 50 nm.
Next, lithium fluoride (LiF) was deposited on this electron transport layer to form an electron injection electrode (cathode) with a thickness of 1 nm.
Then, metal aluminum (Al) was deposited on this electron injection electrode to form a metal Al cathode with a film thickness of 80 nm.
The element structure of the organic EL element according to Example 1 is schematically shown as follows.
ITO(130)/HT1:HA(10,97%:3%)/HT1(110)/HT2(5)/CBP(5)/M3-1:A1(25,50%:50%)/HBL( 5)/ET1(50)/LiF(1)/Al(80)
Note that the numbers in parentheses indicate the film thickness (unit: nm).
Similarly, in parentheses, the number expressed as a percentage (97%: 3%) indicates the proportion (mass%) of the compound HT1 and the compound HA in the hole injection layer, and the number expressed as a percentage (50%: 50%) represents the ratio (% by mass) of compound M3-1 and compound A1 in the light emitting layer.

(Examples 2-3)
In the organic EL devices according to Examples 2 to 3, the first compound and third compound in the light emitting layer in Example 1 were changed to the first compound and third compound listed in Table 1. Except for this, it was produced in the same manner as in Example 1.

(Comparative Examples 1 to 3)
In the organic EL devices according to Comparative Examples 1 to 3, the first compound and third compound in the light emitting layer in Example 1 were changed to the first compound and third compound listed in Table 1. Except for this, it was produced in the same manner as in Example 1.

(Example 4)
A 25 mm x 75 mm x 1.1 mm thick glass substrate with an ITO transparent electrode (anode) (manufactured by Geomatec Co., Ltd.) was ultrasonically cleaned in isopropyl alcohol for 5 minutes, and then UV ozone cleaned for 1 minute. The ITO film thickness was 130 nm.
The cleaned glass substrate with transparent electrode lines is mounted on a substrate holder of a vacuum evaporation apparatus, and first, compound HT1 and compound HA are coated on the surface on which the transparent electrode lines are formed so as to cover the transparent electrode. A hole injection layer having a thickness of 10 nm was formed by vapor deposition. The concentration of compound HT1 in the hole injection layer was 97% by mass, and the concentration of compound HA was 3% by mass.
Next, a compound HT1 was deposited on this hole injection layer to form a first hole transport layer having a thickness of 110 nm.
Next, a compound HT2 was deposited on the first hole transport layer to form a second hole transport layer with a thickness of 5 nm.
Next, the compound CBP was deposited on this second hole transport layer to form an electron barrier layer with a thickness of 5 nm.
Next, on this electron barrier layer, compound M3-4 as a third compound, compound A1 as a first compound, and compound GD as a second compound were co-deposited to a film thickness of 25 nm. A light emitting layer was formed. The concentration of compound M3-4 in the light emitting layer was 59.2% by mass, the concentration of compound A1 was 40% by mass, and the concentration of compound GD was 0.8% by mass.
Next, a compound HBL was deposited on this light emitting layer to form a hole blocking layer with a thickness of 5 nm.
Next, compound ET1 was deposited on this hole blocking layer to form an electron transport layer with a thickness of 50 nm.
Next, lithium fluoride (LiF) was deposited on this electron transport layer to form an electron injection electrode (cathode) with a thickness of 1 nm.
Then, metal aluminum (Al) was deposited on this electron injection electrode to form a metal Al cathode with a film thickness of 80 nm.
The element structure of the organic EL element according to Example 4 is schematically shown as follows.
ITO(130)/HT1:HA(10,97%:3%)/HT1(110)/HT2(5)/CBP(5)/M3-4:A1:GD(25,59.2%:40%:0.8 %)/HBL(5)/ET1(50)/LiF(1)/Al(80)
Note that the numbers in parentheses indicate the film thickness (unit: nm).
Similarly, in parentheses, the numbers expressed as percentages (97%: 3%) indicate the proportions (mass%) of compound HT1 and compound HA in the hole injection layer, and the numbers expressed as percentages (59.2%: 40 %: 0.8%) indicates the proportion (mass %) of compound M3-4, compound A1, and compound GD in the light emitting layer.

(Examples 5 to 7)
The organic EL devices according to Examples 5 to 7 were produced in the same manner as in Example 4, except that the first compound in the light emitting layer in Example 4 was changed to the first compound listed in Table 2. Created.

(Comparative Examples 4-5)
The organic EL devices according to Comparative Examples 4 and 5 were prepared in the same manner as in Example 4, except that the first compound in the light emitting layer in Example 4 was changed to the first compound listed in Table 2. Created.

(Example 8 and Comparative Example 6)
The organic EL devices according to Example 8 and Comparative Example 6 were the same as Example 4 except that the first compound in the light emitting layer in Example 4 was changed to the first compound listed in Table 3. It was made as follows.

<Evaluation of organic EL elements>
The produced organic EL devices were evaluated as shown in Tables 1 to 3. The evaluation results are shown in Tables 1 to 3. Note that the comparative compounds Ref-1 and Ref-2 used in Comparative Examples 1 to 6 do not correspond to the first compound, but are listed in the same column as the first compound for convenience. Tables 1 to 3 also show the evaluation results of the compounds used in the light-emitting layer of each example.

(External quantum efficiency EQE)
A voltage was applied to the produced organic EL device at a current density of 10.00 mA/cm ² , and the spectral radiance spectrum was measured using a spectral radiance meter CS-2000 (manufactured by Konica Minolta, Inc.). From the obtained spectral radiance spectrum, the external quantum efficiency EQE (unit: %) was calculated assuming that Lambassian radiation was performed. Tables 1 and 2 show "external quantum efficiency EQE" (unit: %) and "EQE (relative value)" (unit: %).
"EQE (relative value)" shown in Table 1 was calculated based on the measured value of EQE of each example and the following mathematical formula (Equation 1X). "EQE (relative value)" shown in Table 2 was calculated based on the measured value of EQE of each example and the following mathematical formula (Equation 2X) or (Equation 3X).
EQE (relative value) = (EQE of Example X/EQE of Comparative Example X) x 100... (Math 1X)
(In the mathematical formula (Math. 1X), X is 1, 2, or 3.)
EQE (relative value) = (EQE of Example Y/EQE of Comparative Example 4) x 100... (Math. 2X)
(In the mathematical formula (Math. 2X), Y is 4, 5, 6, or 7.)
EQE (relative value) = (EQE of Comparative Example 5/EQE of Comparative Example 4) x 100... (Math 3X)

(Life span LT95)
A voltage was applied to the manufactured organic EL element so that the current density was 50 mA/cm ² , and the time (LT95 (unit: hr)) until the brightness reached 95% of the initial brightness was measured as the life span. . The brightness was measured using a spectral radiance meter CS-2000 (manufactured by Konica Minolta, Inc.). Table 3 shows "LT95" (unit: hr) and "LT95 (relative value)" (unit: %).
"LT95 (relative value)" shown in Table 3 was calculated based on the following formula (Equation 4X).
LT95 (relative value) = (LT95 of Example 8/LT95 of Comparative Example 6) x 100... (Math. 4X)

(Maximum peak wavelength λp and emission half width FWHM)
The spectral radiance spectrum was measured using a spectral radiance meter CS-2000 (manufactured by Konica Minolta, Inc.) when a voltage was applied to the organic EL device so that the current density of the device was 10.00 mA/cm ² . From the obtained spectral radiance spectrum, the maximum peak wavelength λp (unit: nm) and the emission half width FWHM (unit: nm) of the maximum peak wavelength λp were determined. FWHM is an abbreviation for Full Width at Half Maximum.

(CIE1931 chromaticity)
The CIE1931 chromaticity coordinates (x, y) when a voltage is applied to the organic EL element so that the current density of the element is 10.00 mA/cm ² are measured using a spectral radiance meter CS-2000 (manufactured by Konica Minolta, Inc.). I measured it.

Example 1 in which Compound A1 represented by the general formula (1) was used as the first compound had improved luminous efficiency compared to Comparative Example 1 in which Compound A1 was replaced with Comparative Compound Ref-1.
Similarly, when comparing Example 2 and Comparative Example 2, and when comparing Example 3 and Comparative Example 3, Examples 2 and 3 have improved luminous efficiency compared to Comparative Examples 2 and 3, respectively. did.

Examples 4 to 7 using compounds A1 to A4 represented by the general formula (1) as the first compound are Comparative Example 4 in which compounds A1 to A4 are replaced with comparative compounds Ref-1 or Ref-2, respectively. , 5, the luminous efficiency was improved.

Example 8 in which Compound A5 represented by the general formula (1A) was used as the first compound had a longer life span than Comparative Example 6 in which Compound A5 was replaced with Comparative Compound Ref-1.

<Compound evaluation>
(Measurement of fluorescence quantum yield (PLQY))
A compound to be measured was dissolved in toluene to a concentration of 5 μmol/L to prepare a toluene solution. Thereafter, the prepared solution was bubbled with nitrogen for 5 minutes and sealed to prevent outside air from entering.
The PLQY of the prepared toluene solution of the compound to be measured was measured using an absolute PL (photoluminescence) quantum yield measuring device Quantaurus-QY (manufactured by Hamamatsu Photonics Co., Ltd.).

(Maximum peak wavelength of compound)
The maximum peak wavelength λ of the compound was measured by the following method.
A 5 μmol/L toluene solution of the compound to be measured was prepared and placed in a quartz cell, and the emission spectrum (vertical axis: emission intensity, horizontal axis: wavelength) of this sample was measured at room temperature (300K). In this example, the emission spectrum was measured using a spectrofluorometer (device name: F-7000) manufactured by Hitachi High-Tech Science Co., Ltd. Note that the emission spectrum measuring device is not limited to the device used here. In the emission spectrum, the peak wavelength of the emission spectrum at which the emission intensity is maximum was defined as the maximum peak wavelength λ.

(Delayed fluorescence of compound)
Delayed fluorescence was confirmed by measuring transient PL using the apparatus shown in FIG. The compound A1 was dissolved in toluene to prepare a dilute solution having an absorbance of 0.05 or less at the excitation wavelength in order to eliminate the contribution of self-absorption. In order to prevent quenching due to oxygen, the sample solution was frozen and degassed and then sealed in a cell with a lid under an argon atmosphere, resulting in an oxygen-free sample solution saturated with argon.
The fluorescence spectrum of the above sample solution was measured using a spectrofluorometer FP-8600 (manufactured by JASCO Corporation), and the fluorescence spectrum of an ethanol solution of 9,10-diphenylanthracene was also measured under the same conditions. Using the fluorescence area intensity of both spectra, Morris et al. J. Phys. Chem. The total fluorescence quantum yield was calculated using equation (1) in 80 (1976) 969.
Prompt light emission (immediate light emission) that is observed immediately from the excited state after being excited by pulsed light of a wavelength that the compound A1 absorbs (light emitted from a pulsed laser); and Prompt light emission that is observed immediately after the excitation. There is delayed light emission (delayed light emission) that is not detected and then observed. Delayed fluorescent light emission in this embodiment means that the amount of delayed light emission (delayed light emission) is 5% or more of the amount of prompt light emission (immediate light emission). Specifically, when the amount of prompt light emission (immediate light emission) is X _P and the amount of delay light emission (delayed light emission) is X _D , the value of X _D /X _P is 0.05 or more. means.
The amount of prompt light emission and delay light emission and the ratio thereof can be determined by a method similar to the method described in "Nature 492, 234-238, 2012" (Reference Document 1). Note that the device used to calculate the amount of prompt light emission and delay light emission is not limited to the device described in Reference 1 or the device shown in FIG. 1.
Compounds A2 to A5 and comparative compounds Ref-1 and Ref-2 were also measured in the same manner as compound A1.
For Compounds A1 to A5 and Comparative Compounds Ref-1 and Ref-2, it was confirmed that the amount of delayed light emission (delayed light emission) was 5% or more with respect to the amount of prompt light emission (immediate light emission). Specifically, the value of X _D /X _P was 0.05 or more for Compounds A1 to A5 and Comparative Compounds Ref-1 and Ref-2.

(Singlet energy S ₁ )
The singlet energy _S1 of the compound to be measured was measured by the solution method described above.

(Energy gap T _77K and ΔST)
The energy gap T _77K of the compound to be measured was measured by the method for measuring the energy gap T _77K described in "Relationship between triplet energy and energy gap at 77 [K]" above.
For Compounds A1 to A5 and Comparative Compounds Ref-1 and Ref-2, ΔST was confirmed from the value of energy gap T _77K and the value of singlet energy S ₁ above. "<0.01" in the table indicates that ΔST is less than 0.01 eV.

[Synthesis of compounds]
<Synthesis of compound A1>

Under a nitrogen atmosphere, in a 200 mL three-necked flask, 12H-[1]Benzothieno[2,3-a]carbazole (5.50 g, 20.1 mmol), sodium hydride (containing 40 mass% oil) (0.804 g, 20 .1 mmol) and 50 mL of DMF were added, and the mixture was stirred at 0°C for 15 minutes. Next, intermediate a (1.50 g, 9.14 mmol) was added to the reaction mixture, and the mixture was stirred at room temperature for 2.5 hours. The solid precipitated from the reaction mixture was collected by filtration and washed with ethyl acetate, methanol, and water to obtain 5.0 g of a yellow solid. It was identified as intermediate c by ASAP-MS analysis (yield 82%). ASAP-MS is an abbreviation for Atmospheric Pressure Solid Analysis Probe Mass Spectrometry.

Under a nitrogen atmosphere, in a 500 mL three-necked flask, intermediate c (3.0 g, 4.47 mmol), potassium carbonate (0.927 g, 6.71 mmol), diacetoxypalladium (0.050 g, 0.224 mmol), tricyclohexylphosphine ( P(Cy) ₃ )) (0.188g, 0.671mmol), bromobenzene (0.564mL, 5.37mmol), 2-ethylhexanoic acid (0.283mL, 1.79mmol) and chlorobenzene (447mmol) Add L), 150 Stirred at ℃ for 16 hours. Dichloromethane was added to the reaction solution, and the mixture was passed through silica gel chromatography. After concentrating the obtained solution, it was purified again by silica gel chromatography to obtain 1.20 g of yellow solid. It was identified as compound A1 by GC-MS analysis (yield 36%).

Under a nitrogen atmosphere, in a 500 mL three-necked flask, intermediate c (3.0 g, 4.47 mmol), potassium carbonate (0.927 g, 6.71 mmol), diacetoxypalladium (0.050 g, 0.224 mmol), tricyclohexylphosphine ( 0.188g, 0.671mmol), 4-bromobiphenyl (1.49mL, 8.94mmol), 2-ethylhexanoic acid (0.283mL, 1.79mmol) and Chlorobenzene (300mL), Stirred for 14 hours at °C. . The precipitated solid was collected by filtration and washed with water and dichloromethane. The obtained solid was purified by silica gel chromatography to obtain 1.70 g of yellow solid. It was identified as compound A2 by GC-MS analysis (yield 46%).

Under a nitrogen atmosphere, in a 500 mL three-necked flask, intermediate c (3.0 g, 4.47 mmol), potassium carbonate (0.927 g, 6.71 mmol), diacetoxypalladium (0.050 g, 0.224 mmol), tricyclohexylphosphine ( Add 0.188g, 0.671mmol), 3-bromobiphenyl (1.49mL, 8.94mmol), 2-ethylhexanoic acid (0.283mL, 1.79mmol) and Chlorobenzene (300mL), Stirred for 14 hours at °C. . The precipitated solid was collected by filtration and washed with water and dichloromethane. The obtained solid was purified by silica gel chromatography to obtain 1.70 g of yellow solid. It was identified as compound A3 by GC-MS analysis (yield 35%).

Under a nitrogen atmosphere, in a 500 mL three-necked flask, intermediate c (3.0 g, 4.47 mmol), potassium carbonate (0.927 g, 6.71 mmol), diacetoxypalladium (0.050 g, 0.224 mmol), tricyclohexylphosphine ( 0.188g, 0.671mmol), 1-bromo-3,5-diphenylbenzene (2.77g, 8.94mmol), 2-ethylhexanoic acid (0.283mL, 1.79mmol) and Chlorobenzene ( 300 mL) and 150 Stirred at ℃ for 14 hours. The precipitated solid was collected by filtration and washed with water and dichloromethane. The obtained solid was purified by silica gel chromatography to obtain 0.80 g of yellow solid. It was identified as compound A4 by GC-MS analysis (yield 20%).

Under a nitrogen atmosphere, in a 100 mL three-necked flask, intermediate a (2.5 g, 15.2 mmol), potassium carbonate (3.0 g, 21.7 mmol), diacetoxypalladium (0.171 g, 0.762 mmol), tricyclohexylphosphine ( 0.641g, 2.29mmol), 1-bromo-3,5-diphenylbenzene (5.65g, 18.3mmol), 2-ethylhexanoic acid (0.241mL, 1.52mmol) and Xylene (50mL), 8 0 Stirred at ℃ for 7 hours. 500 mL of dichloromethane was added to the reaction solution and stirred to remove the precipitated solid. The obtained filtrate was concentrated under reduced pressure. The obtained solid was purified by silica gel chromatography to obtain 1.9 g of white solid. It was identified as intermediate d by GC-MS and NMR analysis (yield 32%).

Under a nitrogen atmosphere, 4-phenyl-12H-[1]Benzothieno[2,3-a]carbazole (1.76 g, 5.05 mmol), sodium hydride (containing 40 mass% oil) (0 .193g, 4.82mmol) and 20mL of DMF were added and stirred at 0°C for 15 minutes. Next, intermediate d (0.90 g, 2.29 mmol) was added to the reaction mixture, and the mixture was stirred at room temperature for 1.5 hours. A solid precipitated from the reaction mixture was collected by filtration and washed with methanol. The obtained solid was purified by column chromatography to obtain 1.6 g of yellow solid. It was identified as compound A5 by ASAP-MS analysis (yield 31%).

Under a nitrogen atmosphere, 1,5-dibromo-2,4-difluorobenzene (165 g, 607 mmol), cyanocopper (120 g, 1335 mmol), and NMP (800 mL) were placed in a 2 L three-necked flask and stirred at 150° C. for 5 hours. 1 L of methylene chloride was added to the reaction mixture, filtered through Celite, and the filtrate was concentrated using an evaporator. The obtained solid was purified by silica gel chromatography to obtain 58 g of white solid. It was identified as intermediate a by GC-MS analysis (yield 58%).

Under a nitrogen atmosphere, in a 500 mL three-necked flask, intermediate a (20 g, 122 mmol), potassium carbonate (25.3 g, 183 mmol), diacetoxypalladium (0.410 g, 1.83 mmol), Xphos (1.74 g, 3.66 mmol) , bromobenzene (10.8 mL, 104 mmol), 2-ethylhexanoic acid (1.95 mL, 12.2 mmol), and toluene (300 mL) were added, and the mixture was stirred at 40°C for 16 hours. 500 mL of water was added to the reaction solution and stirred, and the precipitated solid was collected by filtration. The obtained solid was washed with 100 mL of water and 200 mL of methanol, and dried. The obtained solid was purified by silica gel chromatography and Toluene recrystallization to obtain 13.2 g of white solid. It was identified as intermediate b by GC-MS and NMR analysis (yield 45%).

Under a nitrogen atmosphere, in a 100 mL three-necked flask, 12H-[1]Benzothieno[2,3-a]carbazole (2.00 g, 7.33 mmol), sodium hydride (40 mass% oil content) (0.280 g, 6 .99 mmol) and 11 mL of DMF were added, and the mixture was stirred at 0°C for 20 minutes. Next, intermediate b (0.80 g, 3.33 mmol) was added to the reaction mixture, and the mixture was stirred at room temperature for 45 minutes. The solid precipitated from the reaction mixture was collected by filtration, washed with methanol, and purified by silica gel column chromatography to obtain 1.4 g of yellow solid. It was identified as compound Ref-1 by ASAP-MS analysis (yield 56%).

Under a nitrogen atmosphere, 1,5-dibromo-2,4-difluorobenzene (50 g, 184 mmol), chlorotrimethylsilane (60 g, 552 mmol), and THF (200 mL) were placed in a 1000 ml three-necked flask. The material in the three-necked flask was cooled to −78° C. in a dry ice/acetone bath, and then 230 mL (2M, THF solution) of lithium diisopropylamide was added dropwise. The mixture was stirred at -78°C for 2 hours, then returned to room temperature, and further stirred for 2 hours. After stirring, water (200 mL) was added to the three-necked flask, and the organic layer was extracted with ethyl acetate. The extracted organic layer was washed with water and brine, dried over magnesium sulfate, and the solvent was removed under reduced pressure using a rotary evaporator. did. The obtained intermediate a2 (73 g, 175 mmol, yield 95%) was used in the next reaction without purification. Chlorotrimethylsilane is sometimes abbreviated as TMS-Cl. In the chemical formula of intermediate a2, TMS is a trimethylsilyl group. LDA is an abbreviation for lithium diisopropyl amide.

Intermediate a2 (73 g, 175 mmol) and dichloromethane (200 mL) were placed in a 1000 mL eggplant flask under a nitrogen atmosphere. Iodine monochloride (85 g, 525 mmol) was dissolved in dichloromethane (200 mL), added dropwise at 0°C, and then stirred at 40°C for 4 hours. After stirring, return to room temperature, add saturated aqueous sodium bisulfite solution (100 mL), extract the organic layer with dichloromethane, wash the extracted organic layer with water and brine, and dry the washed organic layer with magnesium sulfate. The dried organic layer was concentrated on a rotary evaporator. The compound obtained after concentration was purified by silica gel column chromatography to obtain intermediate b2 (65 g, 124 mmol, yield 71%).

Under a nitrogen atmosphere, intermediate b2 (22 g, 42 mmol), phenylboronic acid (12.8 g, 105 mmol), palladium acetate (0.47 g, 2.1 mmol), and sodium carbonate (22 g, 210 mmol) were placed in a 500 mL three-necked flask. , and methanol (150 mL) were added thereto, and the mixture was stirred at 80°C for 4 hours. After stirring, the reaction solution was allowed to cool to room temperature, and then the organic layer was extracted with ethyl acetate, the extracted organic layer was washed with water and brine, and the washed organic layer was concentrated using a rotary evaporator. The compound obtained after concentration was purified by silica gel column chromatography to obtain intermediate c2 (10 g, 24 mmol, yield 56%). The structure of the purified compound was identified by ASAP-MS.

Under a nitrogen atmosphere, intermediate c2 (10 g, 24 mmol), copper cyanide (10.6 g, 118 mmol), and DMF (15 mL) were placed in a 200 mL three-necked flask and heated and stirred at 150° C. for 8 hours. After stirring and cooling to room temperature, the reaction solution was poured into 10 mL of aqueous ammonia. Next, the organic layer was extracted with methylene chloride, the extracted organic layer was washed with water and brine, and the washed organic layer was dried over magnesium sulfate. After drying, the solvent was removed under reduced pressure using a rotary evaporator, and the compound obtained after removal under reduced pressure was purified by silica gel column chromatography to obtain intermediate d2 (5.8 g, 18.34 mmol, yield 78%). DMF is an abbreviation for N,N-dimethylformamide.

Under a nitrogen atmosphere, in a 100 mL three-necked flask, intermediate d2 (1.0 g, 3.2 mmol), 12H-[1]Benzothieno[2,3-a]carbazole (1.9 g, 7 mmol), and potassium carbonate (1.0 g, 3.2 mmol) were added. 3 g, 9.50 mmol) and 30 mL of DMF were added thereto, and the mixture was stirred at 120°C for 6 hours. After stirring, the precipitated solid was collected by filtration and purified by silica gel column chromatography to obtain compound Ref-2 (1.8 g, 2.2 mmol, yield 69%). The obtained compound was identified as Compound Ref-2 by ASAP-MS analysis.

DESCRIPTION OF SYMBOLS 1... Organic EL element, 2... Substrate, 3... Anode, 4... Cathode, 5... Light emitting layer, 6... Hole injection layer, 7... Hole transport layer, 8... Electron transport layer, 9... Electron injection layer.

Claims

A compound represented by the following general formula (1).

(In the general formula (1),
D 1 and D 2 are each independently a group represented by the following general formula (11), general formula (12) or general formula (13),
However, at least one of D 1 and D 2 is a group represented by the following general formula (12) or general formula (13),
Rx is
halogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 5 to 6 carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 14 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 12 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 6 carbon atoms,
a substituted or unsubstituted arylthio group having 6 to 14 ring carbon atoms,
A group represented by the following general formula (12), or a group represented by the following general formula (13),
However, Rx is a substituted or unsubstituted 9-carbazolyl group, a substituted or unsubstituted pyridyl group, a substituted or unsubstituted pyridazinyl group, a substituted or unsubstituted pyrimidinyl group, a substituted or unsubstituted pyrazinyl group, and a substituted or unsubstituted pyrazinyl group. It is not an unsubstituted triazinyl group. )

(In the general formulas (11) to (13),
Among R 1 to R 8 , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R 11 to R 18 , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R 111 to R 118 , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R 1 to R 8 , R 11 to R 18 and R 111 to R 118 that do not form a single ring and do not form a fused ring are each independently,
hydrogen atom,
halogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 60 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 30 carbon atoms,
a substituted or unsubstituted arylamino group having 6 to 60 ring carbon atoms,
A substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms,
In the general formula (12) and the general formula (13),
A, B and C are each independently any ring structure selected from the group consisting of ring structures represented by the following general formulas (14), (15), (15A) and (15B),
The ring structure A, the ring structure B and the ring structure C are fused with an adjacent ring structure at any position,
p, px and py are each independently 1, 2, 3 or 4,
When p is 2, 3 or 4, the plurality of ring structures A are the same or different,
When px is 2, 3 or 4, the plurality of ring structures B are the same or different,
When py is 2, 3 or 4, the plurality of ring structures C are the same or different,
However, at least one of D 1 and D 2 is
p is 2, 3 or 4, and the ring structure A is a group represented by the above general formula (12) containing a ring structure represented by the following general formula (15A) or (15B), or At least one of px and py is 2, 3, or 4, and the above general formula (13) contains a ring structure represented by the following general formula (15A) or (15B) as ring structure B or ring structure C. ) is a group represented by
* in the general formulas (11) to (13) indicates the bonding position with the benzene ring in the general formula (1). )

(In the general formulas (14) and (15),
The set of R 19 and R 20 is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R 120 and R 19 and R 20 which do not form a single ring and do not form a condensed ring each independently have the same meanings as R 1 to R 8 in the general formula (11). )
In the general formula (12), none of the adjacent groups of two or more of R 11 to R 18 are bonded to each other,
In the general formula (13), none of the groups consisting of two or more adjacent ones of R 111 to R 118 are bonded to each other,
A compound according to claim 1.
having at least one group represented by the general formula (12),
A compound according to claim 1 or claim 2.
The group represented by the general formula (12) is selected from the group consisting of groups represented by the following general formulas (12A), (12B), (12C), (12D), (12E) and (12F). is one of the groups,
4. A compound according to any one of claims 1 to 3.

(In the general formulas (12A), (12B), (12C), (12D), (12E) and (12F),
X 1 is NR 120 , a sulfur atom, or an oxygen atom,
R 11 to R 18 each independently have the same meaning as R 11 to R 18 in the general formula (12),
R 19 and R 20 each independently have the same meaning as R 19 and R 20 in the general formula (14),
R 120 has the same meaning as R 120 in the general formula (15),
* in the general formulas (12A), (12B), (12C), (12D), (12E) and (12F) indicates the bonding position with the benzene ring in the general formula (1). )
The group represented by the general formula (12) is any group selected from the group consisting of the groups represented by the general formulas (12A), (12D) and (12F),
A compound according to claim 4.
X 1 is an oxygen atom or a sulfur atom,
A compound according to claim 4 or claim 5.
R 1 to R 8 , R 11 to R 20 , R 111 to R 118 and R 120 are each independently,
hydrogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
A substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
7. A compound according to any one of claims 1 to 6.
R 1 to R 8 , R 11 to R 20 , R 111 to R 118 and R 120 are each independently,
hydrogen atom,
a substituted or unsubstituted aryl group having 6 to 14 ring carbon atoms,
Substituted or unsubstituted heterocyclic group having 5 to 14 ring atoms,
A substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 6 ring carbon atoms,
8. A compound according to any one of claims 1 to 7.
Rx is
halogen atom,
an unsubstituted aryl group having 6 to 14 ring carbon atoms,
unsubstituted alkyl group having 5 to 6 carbon atoms,
unsubstituted alkylsilyl group having 3 to 6 carbon atoms,
unsubstituted arylsilyl group having 6 to 30 ring carbon atoms,
unsubstituted alkoxy group having 1 to 6 carbon atoms,
an unsubstituted aryloxy group having 6 to 14 ring carbon atoms,
unsubstituted alkylamino group having 2 to 12 carbon atoms,
unsubstituted alkylthio group having 1 to 6 carbon atoms,
an unsubstituted arylthio group having 6 to 14 ring carbon atoms,
unsubstituted quinolyl group,
unsubstituted isoquinolyl group,
unsubstituted quinazolinyl group,
unsubstituted benzimidazolyl group,
unsubstituted phenanthrolinyl group,
substituted or unsubstituted benzocarbazolyl group,
substituted or unsubstituted azacarbazolyl group,
substituted or unsubstituted diazacarbazolyl group,
unsubstituted dibenzofuranyl group,
unsubstituted naphthobenzofuranyl group,
unsubstituted azadibenzofuranyl group,
unsubstituted diazadibenzofuranyl group,
unsubstituted dibenzothiophenyl group,
unsubstituted naphthobenzothiophenyl group,
An unsubstituted azadibenzothiophenyl group, or an unsubstituted diazadibenzothiophenyl group,
9. A compound according to any one of claims 1 to 8.
Rx is
an unsubstituted aryl group having 6 to 14 ring carbon atoms,
unsubstituted alkyl group having 5 to 6 carbon atoms,
unsubstituted quinolyl group,
unsubstituted isoquinolyl group,
unsubstituted quinazolinyl group,
unsubstituted benzimidazolyl group,
unsubstituted phenanthrolinyl group,
substituted or unsubstituted benzocarbazolyl group,
substituted or unsubstituted azacarbazolyl group,
substituted or unsubstituted diazacarbazolyl group,
unsubstituted dibenzofuranyl group,
unsubstituted naphthobenzofuranyl group,
unsubstituted azadibenzofuranyl group,
unsubstituted diazadibenzofuranyl group,
unsubstituted dibenzothiophenyl group,
unsubstituted naphthobenzothiophenyl group,
An unsubstituted azadibenzothiophenyl group, or an unsubstituted diazadibenzothiophenyl group,
10. A compound according to any one of claims 1 to 9.
A compound represented by the following general formula (1A).

(In the general formula (1A),
D 3 and D 4 are each independently a group represented by the following general formula (11), general formula (12) or general formula (13),
However, at least one of D 3 and D 4 is a group represented by the following general formula (12) or general formula (13),
Ry is
halogen atom,
a substituted or unsubstituted aryl group having 13 to 30 ring carbon atoms,
a substituted or unsubstituted heteroaryl group having 6 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 5 to 6 carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 6 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 6 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 14 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 12 carbon atoms,
a substituted or unsubstituted alkylthio group having 1 to 6 carbon atoms,
a substituted or unsubstituted arylthio group having 6 to 14 ring carbon atoms,
A group represented by the following general formula (12) or a group represented by the following general formula (13). )

(In the general formulas (11) to (13),
Among R 1 to R 8 , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R 11 to R 18 , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
Among R 111 to R 118 , at least one set of two or more adjacent ones is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R 1 to R 8 , R 11 to R 18 and R 111 to R 118 that do not form a single ring and do not form a fused ring are each independently,
hydrogen atom,
halogen atom,
a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms;
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
Substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms,
a substituted or unsubstituted arylsilyl group having 6 to 60 ring carbon atoms,
a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms,
a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms,
a substituted or unsubstituted alkylamino group having 2 to 30 carbon atoms,
a substituted or unsubstituted arylamino group having 6 to 60 ring carbon atoms,
A substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms,
However, R 1 to R 8 , R 11 to R 18 and R 111 to R 118 are not unsubstituted biphenyl groups and are not substituted or unsubstituted dibenzofuranyl groups,
In the general formula (12) and the general formula (13),
A, B and C are each independently any ring structure selected from the group consisting of ring structures represented by the following general formulas (14), (15), (15A) and (15B),
The ring structure A, the ring structure B and the ring structure C are fused with an adjacent ring structure at any position,
p, px and py are each independently 1, 2, 3 or 4,
When p is 2, 3 or 4, the plurality of ring structures A are the same or different,
When px is 2, 3 or 4, the plurality of ring structures B are the same or different,
When py is 2, 3 or 4, the plurality of ring structures C are the same or different,
* in the general formulas (11) to (13) indicates the bonding position with the benzene ring in the general formula (1A). )

(In the general formulas (14) and (15),
The set of R 19 and R 20 is
bond to each other to form a substituted or unsubstituted monocycle,
are bonded to each other to form a substituted or unsubstituted condensed ring, or are not bonded to each other,
R 120 and R 19 and R 20 which do not form a single ring and do not form a condensed ring each independently have the same meanings as R 1 to R 8 in the general formula (11). )
In the general formula (12), none of the adjacent groups of two or more of R 11 to R 18 are bonded to each other,
In the general formula (13), none of the groups consisting of two or more adjacent ones of R 111 to R 118 are bonded to each other,
A compound according to claim 11.
having at least one group represented by the general formula (12),
A compound according to claim 11 or claim 12.
The group represented by the general formula (12) is selected from the group consisting of groups represented by the following general formulas (12A), (12B), (12C), (12D), (12E) and (12F). is one of the groups,
14. A compound according to any one of claims 11 to 13.

(In the general formulas (12A), (12B), (12C), (12D), (12E) and (12F),
X 1 is NR 120 , a sulfur atom, or an oxygen atom,
R 11 to R 18 each independently have the same meaning as R 11 to R 18 in the general formula (12),
R 19 and R 20 each independently have the same meaning as R 19 and R 20 in the general formula (14),
R 120 has the same meaning as R 120 in the general formula (15),
* in the general formulas (12A), (12B), (12C), (12D), (12E) and (12F) indicates the bonding position with the benzene ring in the general formula (1A). )
The group represented by the general formula (12) is any group selected from the group consisting of the groups represented by the general formulas (12A), (12D) and (12F),
15. A compound according to claim 14.
X 1 is an oxygen atom or a sulfur atom,
A compound according to claim 14 or claim 15.
R 1 to R 8 , R 11 to R 20 , R 111 to R 118 and R 120 are each independently,
hydrogen atom,
Substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
a substituted or unsubstituted cycloalkyl group having 3 to 30 ring carbon atoms,
substituted or unsubstituted phenyl group,
substituted or unsubstituted naphthyl group,
substituted or unsubstituted imidazolyl group,
substituted or unsubstituted pyrazolyl group,
substituted or unsubstituted triazolyl group,
substituted or unsubstituted tetrazolyl group,
substituted or unsubstituted oxazolyl group,
substituted or unsubstituted isoxazolyl group,
substituted or unsubstituted oxadiazolyl group,
substituted or unsubstituted thiazolyl group,
substituted or unsubstituted isothiazolyl group,
substituted or unsubstituted thiadiazolyl group,
substituted or unsubstituted pyridyl group,
substituted or unsubstituted pyridazinyl group,
substituted or unsubstituted pyrimidinyl group,
substituted or unsubstituted pyrazinyl group,
substituted or unsubstituted triazinyl group,
substituted or unsubstituted indolyl group,
substituted or unsubstituted isoindolyl group,
substituted or unsubstituted indolizinyl group,
substituted or unsubstituted quinolidinyl group,
substituted or unsubstituted quinolyl group,
substituted or unsubstituted isoquinolyl group,
substituted or unsubstituted cinnolyl group,
substituted or unsubstituted phthalazinyl group,
substituted or unsubstituted quinazolinyl group,
substituted or unsubstituted quinoxalinyl group,
substituted or unsubstituted benzimidazolyl group,
substituted or unsubstituted indazolyl group,
substituted or unsubstituted morpholino group,
a substituted or unsubstituted furyl group,
substituted or unsubstituted oxazolyl group,
substituted or unsubstituted isoxazolyl group,
substituted or unsubstituted oxadiazolyl group,
substituted or unsubstituted morpholino group,
substituted or unsubstituted thienyl group,
substituted or unsubstituted thiazolyl group,
a substituted or unsubstituted isothiazolyl group, or a substituted or unsubstituted thiadiazolyl group,
17. A compound according to any one of claims 11 to 16.
Ry is
halogen atom,
a substituted or unsubstituted aryl group having 13 to 30 ring carbon atoms,
a substituted or unsubstituted heteroaryl group having 6 to 30 ring atoms, or
It is a substituted or unsubstituted alkyl group having 5 to 6 carbon atoms.
18. A compound according to any one of claims 11 to 17.
Containing the compound according to any one of claims 1 to 18,
Materials for organic electroluminescent devices.
It has an anode, a cathode, and an organic layer,
The organic layer contains the compound according to any one of claims 1 to 18 as a first compound,
Organic electroluminescent device.
The organic electroluminescent device according to claim 20,
The organic layer has at least one light emitting layer,
the light emitting layer contains the first compound;
Organic electroluminescent device.
The light emitting layer includes the first compound and further a second compound,
The second compound is a fluorescent compound,
The singlet energy S 1 (M1) of the first compound and the singlet energy S 1 (M2) of the second compound satisfy the relationship of the following formula (Equation 1),
The organic electroluminescent device according to claim 21.
S 1 (M1)>S 1 (M2) ... (Math. 1)
The light emitting layer includes the first compound and a third compound,
The singlet energy S 1 (M1) of the first compound and the singlet energy S 1 (M3) of the third compound satisfy the relationship of the following formula (Equation 2),
The organic electroluminescent device according to claim 21.
S 1 (M3)>S 1 (M1)...(Math. 2)
The light-emitting layer includes the first compound, further a second compound, and a third compound,
The second compound is a fluorescent compound,
The singlet energy S 1 (M1) of the first compound, the singlet energy S 1 (M2) of the second compound, and the singlet energy S 1 (M3) of the third compound are as follows. Satisfying the relationship of formula (Math. 3),
The organic electroluminescent device according to claim 21.
S 1 (M3)>S 1 (M1)>S 1 (M2)...(Math. 3)
An electronic device equipped with the organic electroluminescent device according to any one of claims 20 to 24.