KR101849825B1 - Organic light emitting diode - Google Patents

Abstract

The present disclosure relates to an organic light emitting device.

Description

[0001] ORGANIC LIGHT EMITTING DIODE [0002]

The present disclosure relates to an organic light emitting device.

The organic light emission phenomenon is one example in which current is converted into visible light by an internal process of a specific organic molecule. The principle of organic luminescence phenomenon is as follows.

When an organic layer is positioned between the anode and the cathode, when a voltage is applied between the two electrodes, electrons and holes are injected into the organic layer from the cathode and the anode, respectively. Electrons and holes injected into the organic material layer recombine to form an exciton, and the exciton falls back to the ground state to emit light. An organic light emitting device using such a principle may be generally composed of an organic material layer including a cathode, an anode, and an organic material layer disposed therebetween, for example, a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer.

As a material used in an organic light emitting device, a pure organic material or a complex in which an organic material and a metal form a complex is mostly used. Depending on the application, a hole injecting material, a hole transporting material, a light emitting material, an electron transporting material, . As the hole injecting material and the hole transporting material, an organic material having a p-type property, that is, an organic material that is easily oxidized and electrochemically stable at the time of oxidation is mainly used. On the other hand, as an electron injecting material or an electron transporting material, an organic material having an n-type property, that is, an organic material that is easily reduced and electrochemically stable when being reduced is mainly used. As the light emitting layer material, a material having both a p-type property and an n-type property, that is, a material having both a stable form in oxidation and in a reduced state is preferable, and a material having a high luminous efficiency for converting an exciton into light desirable.

Development of a highly efficient organic light emitting device has been required in the art.

Applied Physics Letters 51, p. 913, 1987

An object of the present invention is to provide an organic light emitting device having a low driving voltage and a high efficiency.

The present disclosure relates to an anode; A cathode opposite to the anode; A light emitting layer provided between the anode and the cathode; A hole injection layer provided between the anode and the light emitting layer; And a hole transport layer provided between the hole injection layer and the light emitting layer,

Wherein the hole injection layer comprises a hole injection material represented by the following Formula 1,

Wherein the hole transport layer has an HOMO energy level of 5 eV or more.

[Chemical Formula 1]

In formula (1)

R10 to R15 are the same or different from each other and each independently hydrogen; A halogen group; Nitrile group (-CN); A nitro group (-NO ₂ ); A sulfonyl group (-SO ₂ R); Sulfoxide group (-SOR); A sulfonamide group (-SO ₂ NR _2); Sulfonate groups (-SO ₃ R); A trifluoromethyl group (-CF _3); Ester group (-COOR); An amide group (-CONHR or -CONRR '); A substituted or unsubstituted straight or branched chain C1 to C12 alkoxy group; A substituted or unsubstituted straight or branched chain C1 to C12 alkyl group; A substituted or unsubstituted straight or branched chain C2 to C12 alkenyl group; A substituted or unsubstituted aromatic or non-aromatic heterocyclic group; A substituted or unsubstituted aryl group; A substituted or unsubstituted mono- or di-arylamine group; And a substituted or unsubstituted aralkylamine group,

R and R 'are the same or different from each other and are each independently a substituted or unsubstituted C1 to C60 alkyl group; A substituted or unsubstituted aryl group; And a substituted or unsubstituted 5- to 7-membered aliphatic cyclic group.

Further, the present invention provides a display device including the organic light emitting device.

Further, the present specification provides a lighting apparatus including the organic light emitting element.

The organic light emitting device according to one embodiment of the present invention can prevent the driving voltage from rising due to an increase in the thickness of the hole transport layer by including the material represented by Formula 2 in the hole transport layer. Further, in the relation of the hole transporting layer with the light emitting layer, the hole transporting layer is excellent in electron blocking ability and hole injecting ability in relation to the hole injecting layer.

Accordingly, the organic light emitting device according to one embodiment of the present invention can be configured as an organic light emitting device having a low driving voltage and a high efficiency.

The organic light emitting device according to one embodiment of the present invention can provide a hole transporting layer having excellent hole transporting ability and high stability.

1 shows an example of an organic light emitting device according to an embodiment of the present invention.
2 shows an example of an organic light emitting device according to one embodiment of the present invention.
FIG. 3 is a graph showing a voltage-current graph of an organic light emitting device according to an embodiment and a comparative example of the present invention.
FIG. 4 is a graph showing the luminous efficiency according to the current according to the embodiment and the comparative example of the present invention.

Hereinafter, the present invention will be described in detail.

In this specification, when a member is located on another member, it includes not only when a member is in contact with another member but also when there is another member between the two members.

In this specification, when a part is referred to as "including " an element, it is to be understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The present disclosure relates to an anode; A cathode opposite to the anode; A light emitting layer provided between the anode and the cathode; A hole injection layer provided between the anode and the light emitting layer; And a hole transport layer provided between the hole injection layer and the light emitting layer,

The hole injection layer includes a hole injection material represented by the following Formula 1, and the HOMO energy level of the hole transport layer is 5 eV or more.

In one embodiment of the present invention, the hole transporting layer includes a hole transporting material and a material represented by the following formula (2).

(2)

In formula (2)

At least one of X, Y and Z is represented by the following general formula (3)

The group other than the group of the formula (3) among X, Y and Z is a substituted or unsubstituted aryl group; Or a substituted or unsubstituted nitrogen-containing heterocyclic group,

(3)

In formula (3)

L is a direct bond; A substituted or unsubstituted arylene group; Or a substituted or unsubstituted heteroarylene group,

A is a direct bond; Or C = O,

a is an integer of 1 to 7,

When a is 2 or more, two or more R1's are the same as or different from each other,

R1 is hydrogen; heavy hydrogen; A halogen group; A nitrile group; A nitro group; Imide; Amide group; A hydroxy group; A substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; A substituted or unsubstituted alkoxy group; A substituted or unsubstituted aryloxy group; A substituted or unsubstituted alkylthio group; A substituted or unsubstituted arylthio group; A substituted or unsubstituted alkylsulfoxy group; A substituted or unsubstituted arylsulfoxy group; A substituted or unsubstituted alkenyl group; A substituted or unsubstituted silyl group; A substituted or unsubstituted boron group; A substituted or unsubstituted alkylamine group; A substituted or unsubstituted aralkylamine group; A substituted or unsubstituted arylamine group; A substituted or unsubstituted heteroarylamine group; A substituted or unsubstituted aryl group; Or a substituted or unsubstituted heterocyclic group.

The organic light emitting device according to one embodiment of the present invention may include a material represented by Chemical Formula 2 to prevent an increase in driving voltage as the thickness of the hole transport layer increases. Further, in the relation of the hole transporting layer with the light emitting layer, the hole transporting layer is excellent in electron blocking ability and hole injecting ability in relation to the hole injecting layer.

Accordingly, the organic light emitting device according to one embodiment of the present invention can be configured as an organic light emitting device having a low driving voltage and a high efficiency.

The organic light emitting device according to one embodiment of the present invention can provide a hole transporting layer having excellent hole transporting ability and high stability.

In one embodiment of the present invention, the highest occupied molecular orbital (HOMO) energy level of the hole transport layer is at least 5 eV. Specifically, in one embodiment of the present invention, the highest occupied molecular orbital (HOMO) energy level of the hole transport layer is 5.4 eV or more.

In one embodiment, the highest occupied molecular orbital (HOMO) energy level of the hole transport layer is between 5 eV and 5.8 eV. In another embodiment, the highest occupied molecular orbital (HOMO) energy level of the hole transport layer is 5.4 eV to 5.8 eV.

In one embodiment of the present invention, the hole transporting material is doped with the material represented by Formula 2.

According to one embodiment of the present invention, when the hole transport layer is doped with the material represented by Formula 2, an intermolecular charge transfer (CT) complex may be formed between the hole transport layers .

Specifically, a keto-unit, which is an electron accepting unit of formula (2), interacts with an electron donating group such as an amine or carbazole, Charge-transfer complex can be formed. The intramolecular charge transfer complex may have an effect similar to that of p-doping the hole transporting layer, thereby increasing the conductivity of the hole transporting layer. Therefore, it is possible to prevent the drive voltage from rising.

In addition, according to one embodiment of the present invention, the material represented by Formula 2 is a backbone similar to a hole transport material, which does not have a large difference in HOMO energy level from the hole transport material, It does not form a deep trap like the p-dopant used.

Therefore, the organic light emitting device according to one embodiment of the present invention has an effect of widening the density of state (DOS) of electrons without greatly lowering the hole mobility, and thus the hole transporting ability can be improved.

In one embodiment of the present invention, the hole transporting material may be those used in the art, and may be selected according to the needs of those skilled in the art, and is not limited thereto.

In this specification, the energy level means the magnitude of energy. Therefore, even when the energy level is displayed in the minus (-) direction from the vacuum level, the energy level is interpreted to mean the absolute value of the energy value. For example, the HOMO energy level means the distance from the vacuum level to the highest occupied molecular orbital. The LUMO energy level also means the distance from the vacuum level to the lowest unoccupied molecular orbital.

In the present specification, the measurement of the HOMO energy level can be performed by UV (ultraviolet photoelectron spectroscopy), which measures the ionization potential of a material by irradiating the surface of the thin film with UV light and detecting the protruding electrons. Alternatively, the HOMO energy level can be measured by cyclic voltammetry (CV), which measures the oxidation potential through a voltage sweep after dissolving the analyte in a solvent together with an electrolytic solution. In the case of measuring the HOMO energy level in the thin film form, the UPS can measure more accurate value than CV, and the HOMO energy level in this specification is measured by the UPS method.

In the present specification, the LUMO energy level can be obtained through measurement of IPES (Inverse Photoelectron Spectroscopy) or electrochemical reduction potential. IPES is a method of irradiating an electron beam onto a thin film and measuring the light emitted therefrom to determine the LUMO energy level. In addition, the electrochemical reduction potential can be measured by measuring the reduction potential through a voltage sweep after dissolving the analyte in a solvent together with an electrolytic solution. Alternatively, the LUMO energy level can be calculated using the singlet energy level obtained by measuring the HOMO energy level and the degree of UV absorption of the target material.

In one embodiment of the present invention, the material represented by Formula 2 is 0.1% by weight to 50% by weight based on the mass of the entire hole transport layer. Preferably, in one embodiment of the present invention, the material represented by Formula 2 is 2% by weight to 40% by weight based on the total weight of the hole transport layer. In another embodiment, the material represented by Formula 2 is 4% by weight to 6% by weight based on the total weight of the hole transport layer.

Within the above range, the formation of the above-described intramolecular charge-transfer complex and the electron state density are widened to provide a high hole mobility and an increase in driving voltage can be prevented.

In one embodiment of the present invention, the hole transporting layer including the hole transporting material and the material represented by Formula 2 is a first hole transporting layer, and the organic light emitting element may include a second hole transporting layer including a hole transporting material .

In one embodiment of the present invention, the hole transport layer further includes a second hole transport layer that does not include the material represented by Formula 2.

In one embodiment of the present invention, the thickness of the first hole transporting layer is 1 to 100% of the thickness of the entire hole transporting layer.

In one embodiment of the present invention, the second hole transporting layer is provided between the first hole transporting layer and the light emitting layer.

The structure of an organic light emitting device according to one embodiment of the present invention is illustrated in Figs. 1 and 2. Fig.

FIG. 1 illustrates a structure of an organic light emitting device in which an anode is provided on a substrate, and a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and a cathode are sequentially laminated on the anode.

In this structure, the hole injecting layer includes the hole injecting material represented by Formula 1, and the hole transporting material includes the hole transporting material and the material represented by Formula 2.

May include additional organic layers in the above structure, and may include fewer organic layers.

2 illustrates a structure of an organic light emitting device having an anode on a substrate and a hole injecting layer, a first hole transporting layer, a second hole transporting layer, a light emitting layer, an electron transporting layer, and a cathode sequentially stacked on the anode.

May include additional organic layers in the above structure, and may include fewer organic layers.

In this structure, the hole injection layer includes the hole injection material represented by Formula 1, the first hole transport layer includes the hole transport material and the material represented by Formula 2, and is in contact with the hole injection layer do. The second hole transport layer not containing the material represented by Formula 2 is provided in contact with the light emitting layer.

In one embodiment of the present invention, the first hole transport layer and the second hole transport layer may have a structure in which two layers are stacked. In another embodiment, the first hole transporting layer and the second hole transporting layer may be of a single layer structure in gradation. The above structure may be varied depending on the lamination method, and may be selected according to the needs of those skilled in the art.

The thickness of the first hole transporting layer is 1 to 100% of the sum of the thicknesses of the second hole transporting layer and the first hole transporting layer.

In one embodiment of the present invention, the thickness of the hole transporting layer is 100 nm or more. In this case, it is possible to solve the problem caused by the particles when manufacturing a large-area organic light emitting device without a separate thick film hole transport layer.

In the present specification, the thickness of the hole transport layer means the width between one surface opposed to the anode and the surface opposed thereto.

That is, the organic light emitting device may include only the first hole transporting layer, and may further include the second hole transporting layer.

In one embodiment of the present invention, the first hole transport layer and the hole injection layer are provided in contact with each other. In this case, the hole transporting layer material and the hole injecting material represented by the general formula (1) of the hole transporting layer interact with each other, so that high hole mobility and / or high luminous efficiency can be expected.

In one embodiment of the present invention, at least one of X, Y and Z is any one of the following substituents.

In the substituent,

L1 to L3 are the same or different from each other and are each independently a direct bond; A substituted or unsubstituted arylene group; Or a substituted or unsubstituted heteroarylene group,

R2 and R3 are the same or different and each independently represents a substituted or unsubstituted aryl group; A substituted or unsubstituted heterocyclic group; Or (2)

b is an integer of 1 to 7,

c is an integer of 1 to 3,

d is an integer of 1 to 6,

When b is 2 or more, two or more R < 5 > s are the same as or different from each other,

When c is 2 or more, two or more R < 7 > s are the same as or different from each other,

When d is 2 or more, two or more R < 8 > s are the same as or different from each other,

R4 to R8 are the same or different from each other, and each independently hydrogen; heavy hydrogen; A halogen group; A nitrile group; A nitro group; Imide; Amide group; A hydroxy group; A substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; A substituted or unsubstituted alkoxy group; A substituted or unsubstituted aryloxy group; A substituted or unsubstituted alkylthio group; A substituted or unsubstituted arylthio group; A substituted or unsubstituted alkenyl group; A substituted or unsubstituted silyl group; A substituted or unsubstituted alkylamine group; A substituted or unsubstituted aralkylamine group; A substituted or unsubstituted arylamine group; A substituted or unsubstituted heteroarylamine group; A substituted or unsubstituted aryl group; Or a substituted or unsubstituted heterocyclic group.

Examples of such substituents are described below, but are not limited thereto.

The term "substituted" means that the hydrogen atom bonded to the carbon atom of the compound is replaced with another substituent, and the substituted position is not limited as long as the substituent is a substitutable position, , Two or more substituents may be the same as or different from each other.

As used herein, the term " substituted or unsubstituted " A halogen group; A nitrile group; A nitro group; Imide; Amide group; A hydroxy group; A substituted or unsubstituted alkyl group; A substituted or unsubstituted cycloalkyl group; A substituted or unsubstituted alkoxy group; A substituted or unsubstituted aryloxy group; A substituted or unsubstituted alkylthio group; A substituted or unsubstituted arylthio group; A substituted or unsubstituted alkylsulfoxy group; A substituted or unsubstituted arylsulfoxy group; A substituted or unsubstituted alkenyl group; A substituted or unsubstituted silyl group; A substituted or unsubstituted boron group; A substituted or unsubstituted alkylamine group; A substituted or unsubstituted aralkylamine group; A substituted or unsubstituted arylamine group; A substituted or unsubstituted heteroarylamine group; A substituted or unsubstituted aryl group; And a substituted or unsubstituted heterocyclic group containing at least one of N, O and S as a heteroatom, or a substituent which is substituted with at least two of the substituents exemplified above Substituted or unsubstituted. For example, the "substituent group to which two or more substituents are connected" may be a biphenyl group. That is, the biphenyl group may be an aryl group, and may be interpreted as a substituent in which two phenyl groups are connected.

In the present specification, the halogen group may be fluorine, chlorine, bromine or iodine.

In the present specification, the number of carbon atoms of the imide group is not particularly limited, but is preferably 1 to 25 carbon atoms. Specifically, it may be a compound having the following structure, but is not limited thereto.

In the present specification, the amide group may be mono- or di-substituted by nitrogen of the amide group with hydrogen, a straight-chain, branched-chain or cyclic alkyl group having 1 to 25 carbon atoms or an aryl group having 6 to 25 carbon atoms. Specifically, it may be a compound of the following structural formula, but is not limited thereto.

In the present specification, the alkyl group may be linear or branched, and the number of carbon atoms is not particularly limited, but is preferably 1 to 50. Specific examples include methyl, ethyl, propyl, n-propyl, isopropyl, butyl, n-butyl, isobutyl, tert-butyl, sec- N-pentyl, 3-dimethylbutyl, 2-ethylbutyl, heptyl, n-hexyl, Cyclohexylmethyl, octyl, n-octyl, tert-octyl, 1-methylheptyl, 2-ethylhexyl, 2-propylpentyl, n-nonyl, 2,2-dimethyl Heptyl, 1-ethyl-propyl, 1,1-dimethyl-propyl, isohexyl, 2-methylpentyl, 4-methylhexyl, 5-methylhexyl and the like.

In the present specification, the cycloalkyl group is not particularly limited, but preferably has 3 to 60 carbon atoms, and specifically includes cyclopropyl, cyclobutyl, cyclopentyl, 3-methylcyclopentyl, 2,3-dimethylcyclopentyl, cyclohexyl, But are not limited to, 3-methylcyclohexyl, 4-methylcyclohexyl, 2,3-dimethylcyclohexyl, 3,4,5-trimethylcyclohexyl, 4-tert- butylcyclohexyl, cycloheptyl, Do not.

In the present specification, the alkoxy group may be linear, branched or cyclic. The number of carbon atoms of the alkoxy group is not particularly limited, but is preferably 1 to 20 carbon atoms. Specific examples include methoxy, ethoxy, n-propoxy, isopropoxy, i-propyloxy, n-butoxy, isobutoxy, tert-butoxy, sec-butoxy, n-pentyloxy, neopentyloxy, N-hexyloxy, n-hexyloxy, 3,3-dimethylbutyloxy, 2-ethylbutyloxy, n-octyloxy, n-nonyloxy, n-decyloxy, benzyloxy, But is not limited thereto.

In the present specification, the alkenyl group may be straight-chain or branched, and the number of carbon atoms is not particularly limited, but is preferably 2 to 40. Specific examples include vinyl, 1-propenyl, isopropenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-pentenyl, Butenyl, allyl, 1-phenylvinyl-1-yl, 2-phenylvinyl-1-yl, (Diphenyl-1-yl) vinyl-1-yl, stilbenyl, stilenyl, and the like.

In the present specification, the silyl group specifically includes a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, a propyldimethylsilyl group, a triphenylsilyl group, a diphenylsilyl group, But are not limited thereto.

In the present specification, the aryl group may be a monocyclic aryl group or a polycyclic aryl group, and includes a case where an alkyl group having 1 to 25 carbon atoms or an alkoxy group having 1 to 25 carbon atoms is substituted. In addition, an aryl group in the present specification may mean an aromatic ring.

When the aryl group is a monocyclic aryl group, the number of carbon atoms is not particularly limited, but is preferably 6 to 25 carbon atoms. Specific examples of the monocyclic aryl group include a phenyl group, a biphenyl group, a terphenyl group, and the like, but are not limited thereto.

When the aryl group is a polycyclic aryl group, the number of carbon atoms is not particularly limited. And preferably has 10 to 24 carbon atoms. Specific examples of the polycyclic aryl group include naphthyl, anthracenyl, phenanthryl, pyrenyl, perylenyl, klychenyl, fluorenyl, and the like.

In the present specification, the fluorenyl group may be substituted, and adjacent substituents may be bonded to each other to form a ring.

,

,

및

등이 될 수 있다. 다만, 이에 한정되는 것은 아니다.When the fluorenyl group is substituted,

,

,

And

And the like. However, the present invention is not limited thereto.

In the present specification, the heterocyclic group includes at least one non-carbon atom and at least one hetero atom. Specifically, the hetero atom may include at least one atom selected from the group consisting of O, N, and S, and the like. The number of carbon atoms of the heterocyclic group is not particularly limited, but is preferably 2 to 60 carbon atoms. Examples of the heterocyclic group include a thiophene group, a furane group, a furyl group, an imidazole group, a thiazole group, an oxazole group, an oxadiazole group, a triazole group, a pyridyl group, a bipyridyl group, a pyrimidyl group, A pyridazinyl group, a pyrazinopyrazinyl group, an isoquinoline group, a pyrazinyl group, a pyrazinyl group, a pyrazinyl group, a pyrazinyl group, a quinolinyl group, a quinazolinyl group, a quinoxalinyl group, a phthalazinyl group, a pyridopyrimidinyl group, A benzothiazole group, a benzothiazole group, a benzothiophene group, a dibenzothiophene group, a benzofuranyl group, a phenanthroline, a thiazolyl group, a thiazolyl group, An isoxazolyl group, an oxadiazolyl group, a thiadiazolyl group, a benzothiazolyl group, a phenothiazinyl group, and a dibenzofuranyl group, but is not limited thereto.

The heterocyclic group may be monocyclic or polycyclic, and may be an aromatic, aliphatic or aromatic and aliphatic condensed ring.

In the present specification, examples of the arylamine group include a substituted or unsubstituted monoarylamine group, a substituted or unsubstituted diarylamine group, or a substituted or unsubstituted triarylamine group. The aryl group in the arylamine group may be a monocyclic aryl group or a polycyclic aryl group. The arylamine group having at least two aryl groups may contain a monocyclic aryl group, a polycyclic aryl group, or a monocyclic aryl group and a polycyclic aryl group at the same time.

Specific examples of the arylamine group include phenylamine, naphthylamine, biphenylamine, anthracenylamine, 3-methylphenylamine, 4-methyl-naphthylamine, 2-methyl- But are not limited to, cenylamine, diphenylamine, phenylnaphthylamine, ditolylamine, phenyltolylamine, carbazole and triphenylamine groups.

In the present specification, the heteroaryl group in the heteroarylamine group can be selected from the examples of the above-mentioned heterocyclic group.

In the present specification, the aryl group in the aryloxy group, the arylthioxy group and the aralkylamine group is the same as the aforementioned aryl group. Specific examples of the aryloxy group include phenoxy, p-tolyloxy, m-tolyloxy, 3,5-dimethyl-phenoxy, 2,4,6-trimethylphenoxy, Naphthyloxy, 4-methyl-1-naphthyloxy, 5-methyl-2-naphthyloxy, 1-anthryloxy, 2-anthryl Phenanthryloxy, 9-phenanthryloxy and the like. Examples of the arylthioxy group include phenylthio group, 2-methylphenylthio group, 4-tert-butylphenyl And the like. However, the present invention is not limited thereto.

In the present specification, the alkyl group in the alkylthio group is the same as the alkyl group described above. Specific examples of the alkyloxy group include methylthio group, ethylthio group, tert-butylthio group, hexylthio group, octylthio group and the like, but are not limited thereto.

The arylene group and the heteroarylene group in the present specification mean a divalent group having two bonding positions in an aryl group and a heteroaryl group, respectively. The descriptions of the above-mentioned aryl group and heterocyclic group can be applied, except that they are each 2 groups.

In one embodiment of the present invention, L is a direct bond or a phenylene group.

In one embodiment, L is a direct bond.

In another embodiment, L is a phenylene group.

In one embodiment of the present disclosure, L is a phenylene group and has a binding position at the para position.

In one embodiment of the present disclosure, A is a direct bond.

In another embodiment, A is C = O.

In one embodiment of the present disclosure, R1 is hydrogen.

이다. In one embodiment of the present disclosure, at least one of X, Y, and Z is

to be.

이다. In another embodiment, at least one of X, Y and Z is

to be.

이다. In another embodiment, at least one of X, Y and Z is

to be.

In one embodiment of the present specification, the remaining of X, Y and Z, which is not the formula (2), is a substituted or unsubstituted aryl group.

In one embodiment of the present specification, the remaining of X, Y and Z, which is not the formula (2), is a substituted or unsubstituted phenyl group.

In one embodiment, the rest of X, Y, and Z, other than Formula 2, is a phenyl group.

In one embodiment of the present specification, L1 is a substituted or unsubstituted arylene group.

In one embodiment, L < 1 > is a substituted or unsubstituted biphenylene group.

In one embodiment, L1 is biphenylene.

이다. In another embodiment, L1 is

to be.

In one embodiment of the present specification, R 2 and R 3 are the same or different and are each independently a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R 2 is a substituted or unsubstituted aryl group.

In another embodiment, R 2 is a substituted or unsubstituted phenyl group.

In another embodiment, R 2 is a phenyl group.

In one embodiment of the present specification, R 2 is a substituted or unsubstituted naphthyl group.

In another embodiment, R2 is a naphthyl group.

이다. In one embodiment of the present disclosure, R2 is

to be.

In another embodiment, R 3 is a substituted or unsubstituted phenyl group.

In another embodiment, R < 3 > is a phenyl group.

In one embodiment of the present invention, R 3 is a substituted or unsubstituted naphthyl group.

In another embodiment, R < 3 > is a naphthyl group.

이다. In one embodiment of the present disclosure, R3 is

to be.

In one embodiment of the present specification, L2 is a substituted or unsubstituted arylene group.

In another embodiment, L2 is a substituted or unsubstituted phenylene group.

In another embodiment, L2 is a phenylene group.

In one embodiment of the present specification, L2 is a phenylene group and has a bonding position at a para position.

In one embodiment of the present disclosure, R4 is a substituted or unsubstituted aryl group.

In another embodiment, R4 is a substituted or unsubstituted phenyl group.

In one embodiment of the present disclosure, R4 is a phenyl group.

In one embodiment of the present disclosure, R5 is hydrogen.

In one embodiment of the present specification, L3 is a substituted or unsubstituted arylene group.

In another embodiment, L3 is a substituted or unsubstituted phenylene group.

In another embodiment, L3 is a phenylene group.

In one embodiment of the present invention, L3 is a phenylene group and has a bonding position at a para position.

In one embodiment of the present disclosure, R6 is a substituted or unsubstituted aryl group.

In another embodiment, R6 is a substituted or unsubstituted phenyl group.

In one embodiment of the present disclosure, R6 is a phenyl group.

In one embodiment of the present disclosure, R7 is hydrogen.

In one embodiment of the present disclosure, R8 is hydrogen.

In one embodiment of the present invention, the compound represented by Formula 2 is represented by any one of the following Formulas 2-1 to 2-14.

In one embodiment of the present specification, R10 to R15 are the same or different from each other and each independently represents a nitrile group; A sulfonyl group; A nitro group; A substituted or unsubstituted aryl group; Or a substituted or unsubstituted alkenyl group.

In one embodiment of the present invention, R10 to R15 are the same or different from each other and each independently represents a nitrile group; A sulfonyl group substituted with an aryl group; A nitro group; An aryl group substituted with a nitro group or a nitrile group; Or an alkenyl group substituted with a nitrile group.

In one embodiment of the present disclosure, R10 is a nitrile group.

In yet one embodiment, the R10 is a sulfonyl group (-SO ₂ R).

In one embodiment of the present disclosure, R10 is a nitro group.

In another embodiment, R10 is a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R10 is an aryl group substituted with a nitro group.

In another embodiment, R10 is a phenyl group substituted with a nitro group.

In one embodiment of the present disclosure, R10 is an aryl group substituted with a nitrile group.

In another embodiment, R10 is a phenyl group substituted with a nitrile group.

In one embodiment of the present specification, R10 is a substituted or unsubstituted alkenyl group.

In another embodiment, R10 is an alkenyl group substituted with a nitrile group.

In one embodiment of the present disclosure, R11 is a nitrile group.

In yet one embodiment, the R11 is a sulfonyl group (-SO ₂ R).

In one embodiment of the present disclosure, R11 is a nitro group.

In another embodiment, R11 is a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R11 is an aryl group substituted with a nitro group.

In another embodiment, R11 is a phenyl group substituted with a nitro group.

In one embodiment of the present disclosure, R11 is an aryl group substituted with a nitrile group.

In another embodiment, R11 is a phenyl group substituted with a nitrile group.

In one embodiment of the present specification, R11 is a substituted or unsubstituted alkenyl group.

In another embodiment, R11 is an alkenyl group substituted with a nitrile group.

In one embodiment of the present specification, R12 is a nitrile group.

In yet one embodiment, the R12 is a sulfonyl group (-SO ₂ R).

In one embodiment of the present disclosure, R12 is a nitro group.

In another embodiment, R12 is a substituted or unsubstituted aryl group.

In one embodiment of the present invention, R12 is an aryl group substituted with a nitro group.

In another embodiment, R12 is a phenyl group substituted with a nitro group.

In one embodiment of the present disclosure, R12 is an aryl group substituted with a nitrile group.

In another embodiment, R12 is a phenyl group substituted with a nitrile group.

In one embodiment of the present specification, R12 is a substituted or unsubstituted alkenyl group.

In another embodiment, R12 is an alkenyl group substituted with a nitrile group.

In one embodiment of the present disclosure, R13 is a nitrile group.

In yet one embodiment, the R13 is a sulfonyl group (-SO ₂ R).

In one embodiment of the present disclosure, R13 is a nitro group.

In another embodiment, R13 is a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R13 is an aryl group substituted with a nitro group.

In another embodiment, R13 is a phenyl group substituted with a nitro group.

In one embodiment of the present disclosure, R13 is an aryl group substituted with a nitrile group.

In another embodiment, R13 is a phenyl group substituted with a nitrile group.

In one embodiment of the present specification, R13 is a substituted or unsubstituted alkenyl group.

In another embodiment, R13 is an alkenyl group substituted with a nitrile group.

In one embodiment of the present disclosure, R14 is a nitrile group.

In yet one embodiment, the R14 is a sulfonyl group (-SO ₂ R).

In one embodiment of the present disclosure, R14 is a nitro group.

In another embodiment, R14 is a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R14 is an aryl group substituted with a nitro group.

In another embodiment, R14 is a phenyl group substituted with a nitro group.

In one embodiment of the present disclosure, R14 is an aryl group substituted with a nitrile group.

In another embodiment, R14 is a phenyl group substituted with a nitrile group.

In one embodiment of the present invention, R14 is a substituted or unsubstituted alkenyl group.

In another embodiment, R14 is an alkenyl group substituted with a nitrile group.

In one embodiment of the present disclosure, R15 is a nitrile group.

In yet one embodiment, the R15 is a sulfonyl group (-SO ₂ R).

In one embodiment of the present disclosure, R15 is a nitro group.

In another embodiment, R15 is a substituted or unsubstituted aryl group.

In one embodiment of the present specification, R15 is an aryl group substituted with a nitro group.

In another embodiment, R15 is a phenyl group substituted with a nitro group.

In one embodiment of the present specification, R15 is an aryl group substituted with a nitrile group.

In another embodiment, R15 is a phenyl group substituted with a nitrile group.

In one embodiment of the present invention, R15 is a substituted or unsubstituted alkenyl group.

In another embodiment, R15 is an alkenyl group substituted with a nitrile group.

In one embodiment of the present specification, R is a substituted or unsubstituted aryl group.

In another embodiment, R is a phenyl group.

In one embodiment of the present invention, the hole injecting material represented by Formula 1 is represented by any one of the following Formulas 1-1 to 1-6.

In one embodiment of the present invention, the hole injection layer includes the hole injection material represented by Formula 1-1.

The organic light emitting device of the present invention can be manufactured by materials and methods known in the art, except that the hole injection layer and the hole transport layer described above are included.

For example, the organic light emitting device of the present specification can be manufactured by sequentially laminating an anode, an organic layer, and a cathode on a substrate. At this time, a metal or a metal oxide having conductivity or an alloy thereof is deposited on the substrate by a PVD (physical vapor deposition) method such as sputtering or e-beam evaporation to form an anode Forming an organic material layer including a hole injecting layer, a hole transporting layer, a light emitting layer and an electron transporting layer thereon, and then depositing a material usable as a cathode thereon. In addition to such a method, an organic light emitting device can be formed by sequentially depositing a cathode material, an organic material layer, and an anode material on a substrate.

The organic material layer of the organic light emitting device of the present invention may have a multi-layer structure in which two or more organic material layers are stacked.

In one embodiment of the present invention, the organic light emitting device further includes one or more layers selected from the group consisting of a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, an electron blocking layer and a hole blocking layer can do.

In one embodiment of the present invention, the organic light emitting diode may be a tandem organic light emitting diode.

Specifically, in one embodiment of the present invention, the organic light emitting element includes two or more light emitting units, and the hole transporting layer is included in a light emitting unit close to the anode among the two or more light emitting units.

In the present specification, the light emitting unit includes at least one light emitting layer, and may further include an organic layer as required. The organic material layer may be selected from the group consisting of a hole injecting layer, a hole transporting layer, an electron transporting layer, an electron injecting layer, an electron blocking layer and a hole blocking layer.

In this specification, in the case of the organic light emitting device including two or more light emitting units, a charge generating layer may be further included between the adjacent two or more light emitting units.

In this specification, the charge generating layer refers to a layer in which holes and electrons are generated when a voltage is applied. The charge generating layer may be provided between the light emitting layer and any one of the electrodes. Specifically, the charge generation layer may be provided between the anode and the light emitting layer. The charge generation layer may include an n-type organic compound layer such as hexaazatriphenylene and a p-type organic compound layer such as NPB on a surface close to the cathode. Specifically, a p-type organic layer, an n-type organic layer, and a charge generation layer may be sequentially stacked from the cathode side.

As the anode material, a material having a large work function is preferably used so that injection of holes into the organic material layer is smooth. Specific examples of the cathode material that can be used in the present invention include metals such as vanadium, chromium, copper, zinc, and gold, or alloys thereof; Metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); ZnO: Al or SNO _2: a combination of a metal and an oxide such as Sb; Conductive polymers such as poly (3-methylthiophene), poly [3,4- (ethylene-1,2-dioxy) thiophene] (PEDOT), polypyrrole and polyaniline.

The cathode material is preferably a material having a small work function to facilitate electron injection into the organic material layer. Specific examples of the negative electrode material include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead or alloys thereof; Layer structure materials such as LiF / Al or LiO ₂ / Al, but are not limited thereto.

The hole injecting material is a layer for injecting holes from the electrode. The hole injecting material has a hole injecting effect, a hole injecting effect in the anode, and an excellent hole injecting effect in the light emitting layer or the light emitting material. A compound which prevents the exciton from migrating to the electron injection layer or the electron injection material and is also excellent in the thin film forming ability is preferable. The highest occupied molecular orbital (HOMO) of the hole injecting material is preferably between the work function of the anode material and the highest occupied molecular orbital (HOMO) of the surrounding organic layer. Specific examples of the hole injecting material include metal porphyrin, oligothiophene, arylamine-based organic materials, hexanitrile hexaazatriphenylene-based organic materials, quinacridone-based organic materials, and perylene- , Anthraquinone, polyaniline and polythiophene-based conductive polymers, but the present invention is not limited thereto.

The hole transport layer is a layer that transports holes from the hole injection layer to the light emitting layer. The hole transport material is a material capable of transporting holes from the anode or the hole injection layer to the light emitting layer. The material is suitable. Specific examples include arylamine-based organic materials, conductive polymers, and block copolymers having a conjugated portion and a non-conjugated portion together, but are not limited thereto.

The light emitting material is preferably a material capable of emitting light in the visible light region by transporting and receiving holes and electrons from the hole transporting layer and the electron transporting layer, respectively, and having good quantum efficiency for fluorescence or phosphorescence. Specific examples include 8-hydroxy-quinoline aluminum complex (Alq ₃ ); Carbazole-based compounds; Dimerized styryl compounds; BAlq; 10-hydroxybenzoquinoline-metal compounds; Compounds of the benzoxazole, benzothiazole and benzimidazole series; Polymers of poly (p-phenylenevinylene) (PPV) series; Spiro compounds; Polyfluorene, rubrene, and the like, but are not limited thereto.

The light emitting layer may include a host material and a dopant material. The host material is a condensed aromatic ring derivative or a heterocyclic compound. Specific examples of the condensed aromatic ring derivatives include anthracene derivatives, pyrene derivatives, naphthalene derivatives, pentacene derivatives, phenanthrene compounds, and fluoranthene compounds. Examples of the heterocycle-containing compounds include carbazole derivatives, dibenzofuran derivatives, Furan compounds, pyrimidine derivatives, and the like, but are not limited thereto.

The dopant material includes an organic compound, a metal, or a metal compound.

Examples of the organic compound as the dopant material include an aromatic amine derivative, a styrylamine compound, a boron complex, and a fluoranthene compound. Specific examples of the aromatic amine derivatives include condensed aromatic ring derivatives having substituted or unsubstituted arylamino groups, and examples thereof include pyrene, anthracene, chrysene, and peripherrhene having an arylamino group. Examples of the styrylamine compound include substituted or unsubstituted Wherein at least one aryl vinyl group is substituted with at least one aryl vinyl group, and at least one substituent selected from the group consisting of an aryl group, a silyl group, an alkyl group, a cycloalkyl group and an arylamino group is substituted or unsubstituted. Specific examples thereof include, but are not limited to, styrylamine, styryldiamine, styryltriamine, styryltetraamine, and the like. As the metal or metal compound, a common metal or metal compound can be used. Specifically, metal complexes can be used. Examples of the metal complex include iridium complex, platinum complex, and the like, but are not limited thereto.

The electron transporting material is a layer that receives electrons from the electron injecting layer and transports electrons to the light emitting layer. The electron transporting material is a material capable of transferring electrons from the cathode well to the light emitting layer. Is suitable. Specific examples include an Al complex of 8-hydroxyquinoline; Complexes containing Alq ₃ ; Organic radical compounds; Hydroxyflavone-metal complexes, and the like, but are not limited thereto. The electron transporting layer can be used with any desired cathode material as used according to the prior art. In particular, an example of a suitable cathode material is a conventional material with a low work function followed by an aluminum layer or silver layer. Specifically cesium, barium, calcium, ytterbium and samarium, in each case followed by an aluminum layer or a silver layer.

The electron injection layer is a layer for injecting electrons from the electrode. The electron injection layer has the ability to transport electrons, has an electron injection effect from the cathode, and has an excellent electron injection effect with respect to the light emitting layer or the light emitting material. A compound which prevents migration to a layer and is excellent in a thin film forming ability is preferable. Specific examples thereof include fluorenone, anthraquinodimethane, diphenoquinone, thiopyran dioxide, oxazole, oxadiazole, triazole, imidazole, perylenetetracarboxylic acid, preorenylidene methane, A complex compound and a nitrogen-containing five-membered ring derivative, but are not limited thereto.

Examples of the metal complex compound include 8-hydroxyquinolinato lithium, bis (8-hydroxyquinolinato) zinc, bis (8-hydroxyquinolinato) copper, bis (8- Tris (8-hydroxyquinolinato) aluminum, tris (2-methyl-8-hydroxyquinolinato) aluminum, tris (8- hydroxyquinolinato) gallium, bis (10- Quinolinato) beryllium, bis (10-hydroxybenzo [h] quinolinato) zinc, bis (2-methyl-8- quinolinato) chlorogallium, bis (2-methyl-8-quinolinato) (2-naphtholato) gallium, and the like, But is not limited thereto.

The hole blocking layer prevents holes from reaching the cathode, and may be formed under the same conditions as those of the hole injecting layer. Specific examples thereof include, but are not limited to, oxadiazole derivatives, triazole derivatives, phenanthroline derivatives, BCP, aluminum complexes and the like.

The organic light emitting device according to the present invention may be of a top emission type, a back emission type, or a both-side emission type, depending on the material used.

In addition, the organic light emitting diode according to the present invention may be an inverted type in which the lower electrode is a cathode, the upper electrode is a cathode, the lower electrode is a cathode, and the upper electrode is an anode.

According to an embodiment of the present invention, the organic light emitting display further includes a substrate provided on a surface of the anode facing the surface on which the organic layer is provided, and an internal light extracting layer provided between the substrate and the anode.

In another embodiment, the organic light-emitting device further includes a substrate provided on a surface of the anode facing the surface on which the organic material layer is provided, and further includes an external light extracting layer on a surface of the substrate facing the surface on which the anode is provided .

In one embodiment of the present disclosure, the inner light extracting layer includes a flat layer.

In another embodiment, the external light extraction layer comprises a flat layer.

According to an embodiment of the present invention, the inner light-scattering layer or the outer light-extracting layer is not particularly limited as long as it can induce light scattering and improve the light extraction efficiency of the organic light-emitting device. Specifically, according to one embodiment of the present invention, the light extracting layer may be a structure in which scattering particles are dispersed in a binder.

According to one embodiment of the present invention, the light scattering layer may be formed directly on the substrate by spin coating, bar coating, slit coating, or the like, or may be formed in a film form and attached.

According to an embodiment of the present invention, the organic light emitting device may be a flexible organic light emitting device. In this case, the substrate may comprise a flexible material. Specifically, the substrate may be a glass, a plastic substrate, or a film-like substrate in the form of a thin film which can be bent.

The material of the plastic substrate is not particularly limited, but may be a film including PET, PEN, PEEK and PI in a single layer or a multilayer form.

One embodiment of the present invention provides a display device including the organic light emitting device. In the display device, the organic light emitting diode may serve as a pixel or a backlight. Besides, the configuration of the display device may be applied to those known in the art.

One embodiment of the present invention provides a lighting apparatus including the organic light emitting element. In the illumination device, the organic light emitting element plays a role of a light emitting portion. In addition, configurations necessary for the illumination device can be applied to those known in the art.

The structure according to one embodiment of the present disclosure can act on a principle similar to that applied to organic light emitting devices in organic electronic devices including organic solar cells, organophotoreceptors, organic transistors and the like.

The present invention will be described in more detail with reference to the following examples. However, the following examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.

Comparative Example 1

Device structure: ITO (1,300 Å) / HAT (30 Å) / HTL (1,400 Å) / EML (200 Å) / ETL (360 Å) / Al (1,000 Å)

Hexanitrile hexaazatriphenylene (HAT-CN) was thermally deposited on the ITO electrode to a thickness of 300A. Subsequently, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (NPB) was vacuum deposited to a thickness of 1,400 Å to form a hole transport layer.

The light emitting layer, the electron transporting layer, and the cathode were deposited at the thicknesses described above to fabricate an organic light emitting device.

In the above process, the deposition rate of the organic material was maintained at 0.5 to 2 Å / sec, the deposition rate of aluminum was maintained at 2 Å / sec, and the vacuum degree during deposition was maintained at 2 × 10 ^-7 to 4 × 10 ^-8 mtorr Thus, an organic light emitting device was fabricated.

[LINE]

[NPB]

[Example 1]

A device was manufactured in the same manner as in Comparative Example 1, except that 10% by weight of the material represented by Formula 2 was doped to the total mass of the hole transporting layer in Comparative Example 1. [

[Example 2]

A device was manufactured in the same manner as in Comparative Example 1, except that 20% by weight of the material represented by the formula (2) was doped to the total mass of the hole transport layer in the above Comparative Example 1 and laminated.

 [Example 3]

A device was fabricated in the same manner as in Comparative Example 1, except that 30% by weight of the material represented by Formula 2 was doped to the total mass of the hole transporting layer in Comparative Example 1. [

 [Example 4]

A device was manufactured in the same manner as in Comparative Example 1, except that 10% by weight of the material represented by Formula 2 was doped to the total mass of the hole transporting layer in Comparative Example 1. [

FIG. 3 is a graph showing a voltage-current graph of an organic light emitting device according to an embodiment and a comparative example of the present invention.

FIG. 4 is a graph showing the luminous efficiency according to the current according to the embodiment and the comparative example of the present invention.

3 and 4, the organic light emitting device according to each of Examples 1 to 4 exhibits an increase in driving voltage as compared with the organic light emitting device according to Comparative Example 1 and shows excellent efficiency even at a low current density have.

Claims (19)

Anode;
A cathode opposite to the anode;
A light emitting layer provided between the anode and the cathode;
A hole injection layer provided between the anode and the light emitting layer; And
And a hole transport layer provided between the hole injection layer and the light emitting layer,
Wherein the hole injection layer comprises a hole injection material represented by the following Formula 1,
Wherein the hole transport layer comprises a hole transport material and a material represented by the following Formula 2 and has a HOMO energy level of 5 eV or more:
[Chemical Formula 1]

In formula (1)
R10 to R15 are the same or different from each other and each independently hydrogen; A halogen group; Nitrile group (-CN); A nitro group (-NO ₂ ); A sulfonyl group (-SO ₂ R); Sulfoxide group (-SOR); A sulfonamide group (-SO ₂ NR _2); Sulfonate groups (-SO ₃ R); A trifluoromethyl group (-CF _3); Ester group (-COOR); An amide group (-CONHR or -CONRR '); A substituted or unsubstituted straight or branched chain C1 to C12 alkoxy group; A substituted or unsubstituted straight or branched chain C1 to C12 alkyl group; A substituted or unsubstituted straight or branched chain C2 to C12 alkenyl group; A substituted or unsubstituted aromatic or non-aromatic heterocyclic group; A substituted or unsubstituted aryl group; A substituted or unsubstituted mono- or di-arylamine group; And a substituted or unsubstituted aralkylamine group,
R and R 'are the same or different from each other and are each independently a substituted or unsubstituted C1 to C60 alkyl group; A substituted or unsubstituted aryl group; And a substituted or unsubstituted 5- to 7-membered aliphatic cyclic group,
(2)

In formula (2)
At least one of X, Y and Z is represented by the following general formula (3)
(3)

In formula (3)
L is a direct bond; Or an arylene group,
A is a direct bond; Or C = O,
a is an integer of 1 to 7,
R1 is hydrogen,
At least one of X, Y, and Z is not an aryl group; Or one of the following substituents,

In the substituent,
L1 to L3 are the same or different from each other and are each independently an arylene group,
R2 and R3 are the same or different and are each independently an aryl group; Or (3)
b is an integer of 1 to 7,
c is an integer of 1 to 3,
d is an integer of 1 to 6,
When b is 2 or more, two or more R < 5 > s are the same as or different from each other,
When c is 2 or more, two or more R < 7 > s are the same as or different from each other,
When d is 2 or more, two or more R < 8 > s are the same as or different from each other,
R4 to R8 are the same or different from each other, and each independently hydrogen; heavy hydrogen; Or an aryl group. delete The method according to claim 1,
Wherein the material represented by Formula 2 is 0.1 wt% to 50 wt% with respect to the mass of the total hole transport layer. The method according to claim 1,
The hole transporting layer comprising the hole transporting material and the material represented by Formula 2 is a first hole transporting layer,
Wherein the organic light emitting device further comprises a second hole transport layer including a hole transport material. delete The method of claim 4,
And the second hole transport layer is provided between the first hole transport layer and the light emitting layer. The method of claim 4,
Wherein the first hole transport layer and the hole injection layer are in contact with each other. delete The method according to claim 1,
Wherein the compound represented by the formula (2) is represented by any one of the following formulas (2-1) to (2-14).

. The method according to claim 1,
Wherein the hole injection material represented by Formula 1 is represented by any one of the following Formulas 1-1 to 1-6:

. The method according to claim 1,
Wherein the thickness of the hole transporting layer is 100 nm or more. The method according to claim 1,
The organic light emitting device includes a hole injection layer, a hole transport layer, An electron transport layer, an electron injection layer, an electron blocking layer, and a hole blocking layer. The method according to claim 1,
Further comprising a substrate provided on a surface of the anode facing the surface on which the organic material layer is provided,
And an internal light extraction layer provided between the substrate and the anode. 14. The method of claim 13,
Wherein the inner light extracting layer comprises a flat layer. The method according to claim 1,
Further comprising a substrate provided on a surface of the anode facing the surface on which the organic material layer is provided,
And an external light extraction layer on a surface of the substrate opposite to a surface on which the anode is provided. 16. The method of claim 15,
Wherein the external light extraction layer comprises a flat layer. The method according to claim 1,
Wherein the organic light emitting element is a flexible organic light emitting element. A display device comprising an organic light-emitting device according to any one of claims 1, 3, 4, 6, 7 and 9 to 17. An illumination device comprising an organic light-emitting device according to any one of claims 1, 3, 4, 6, 7, 9 to 17.

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