WO2005123873A1 - 有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 - Google Patents
有機エレクトロルミネッセンス素子材料、有機エレクトロルミネッセンス素子、表示装置及び照明装置 Download PDFInfo
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- WO2005123873A1 WO2005123873A1 PCT/JP2005/010552 JP2005010552W WO2005123873A1 WO 2005123873 A1 WO2005123873 A1 WO 2005123873A1 JP 2005010552 W JP2005010552 W JP 2005010552W WO 2005123873 A1 WO2005123873 A1 WO 2005123873A1
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- organic
- organic electroluminescent
- electroluminescent device
- tautomer
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/346—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising platinum
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/18—Metal complexes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/322—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising boron
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/341—Transition metal complexes, e.g. Ru(II)polypyridine complexes
- H10K85/348—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising osmium
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/30—Coordination compounds
- H10K85/361—Polynuclear complexes, i.e. complexes comprising two or more metal centers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/633—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
Definitions
- Organic electroluminescent device organic electroluminescent device
- the present invention relates to a material for an organic electroluminescent device, a device for an organic electroluminescent device, a display device, and a lighting device.
- ELD electroluminescent display
- ELD components include an inorganic electroluminescent device and an organic electroluminescent device (hereinafter referred to as an organic EL device).
- Inorganic electroluminescent devices have been used as flat light sources, but high voltage AC is required to drive the light emitting devices.
- An organic EL device has a structure in which a light-emitting layer containing a compound that emits light is sandwiched between a cathode and an anode. Electrons and holes are injected into the light-emitting layer and recombined to generate excitons.
- a stilbene derivative, a distyrylarylene derivative or a tris styrylarylene derivative is doped with a small amount of a phosphor to achieve an improvement in light emission luminance and a long life of the device. .
- an element having an organic light-emitting layer obtained by using an 8-hydroxyquinoline aluminum complex as a host conjugate and adding a small amount of a phosphor thereto for example, JP-A-63-264692
- a device having an organic light emitting layer in which a quinoline aluminum complex is used as a host conjugate and doped with a quinacridone dye for example, JP-A-3-255190
- the generation ratio of a luminescent excited species is 25% because the generation ratio between a singlet exciton and a triplet exciton is 1: 3, Since the light extraction efficiency is about 20%, the limit of the external extraction quantum efficiency (ext) is 5%.
- the upper limit of the internal quantum efficiency is 100. / o, so the luminous efficiency power is four times higher in principle than in the case of singlet excitation, and it is possible to obtain almost the same performance as a cold-cathode tube. .
- Onoleto metal iodide complexes in which the central metal is platinum instead of iridium, have also attracted attention.
- this type of complex there are many known examples in which ligands are characterized (for example, see Patent Documents:! To 5 and Non-Patent Document 1).
- the light emission luminance and the light emission efficiency of the light emitting element are greatly improved as compared with the conventional element because the emitted light is derived from phosphorescence.
- the light emission lifetime is shorter than that of the conventional device.
- phosphorescent high-efficiency light-emitting materials are difficult to shorten the emission wavelength and improve the light-emitting life of the device, and can achieve sufficient performance for practical use. .
- an electron-withdrawing group such as a fluorine atom, a trifluoromethyl group or a cyano group has been introduced as a substituent into phenylpyridine, and picolinic acid or virazabole-based ligand has been used as a ligand.
- a ligand for example, see Patent Documents 6 to 13 and Non-Patent Documents:! To 4
- the emission wavelength of the light-emitting material is shortened. While blue can be achieved and a highly efficient device can be achieved, the emission lifetime of the device tends to be degraded, and improvement of the trade-off has been required.
- Patent Document 1 JP-A-2002-332291
- Patent Document 2 JP 2002-332292 A
- Patent Document 3 JP-A-2002-338588
- Patent Document 4 JP-A-2002-226495
- Patent Document 5 Japanese Patent Application Laid-Open No. 2002-234894
- Patent Document 6 WO 02/15645 pamphlet
- Patent Document 7 JP-A-2003-123982
- Patent Document 8 Japanese Patent Application Laid-Open No. 2002-117978
- Patent Document 9 JP 2003-146996 A
- Patent Document 10
- Patent Document 11 International Publication No. 05/007767 pamphlet
- Patent Document 12 WO 04/101707 pamphlet
- Patent Document 13 JP 2005-053912 A
- Non-Patent Document 1 Inorganic Chemistry, Vol. 41, No. 12, pp. 3055-3066 (2002)
- Non-Patent Document 2 Aplied Physics Letters, Vol. 79, page 2082 (2001)
- Non-Patent Document 3 Aplied Physics Letters, Vol. 83, page 3818 (2003)
- Non-Patent Document 4 New Journal of Chemistry, 26 Vol., P. 1171 (2002) Disclosure of the Invention
- An object of the present invention is to provide an organic EL element, a lighting device, and a display device, in which the emission wavelength is controlled, which exhibits high luminous efficiency, and which has a long emission life.
- One embodiment of the present invention for achieving the above object is a metal complex having the following general formula (1) or a tautomer of the general formula (1) as a partial structure. It is a feature of the organic electroluminescent device material.
- Z11 represents an atom group necessary for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- R 1, R 2 and R 3 each represent a hydrogen atom or a substituent.
- M is the periodic table of the elements
- FIG. 1 is a schematic diagram showing an example of a display device including an organic EL element.
- FIG. 2 is a schematic diagram of a display unit A.
- FIG. 3 is an equivalent circuit diagram of a driving circuit constituting a pixel.
- FIG. 4 is a schematic diagram of a display device using a passive matrix method.
- FIG. 5 is a schematic diagram of a sealing structure of an organic EL element OLED1-1.
- FIG. 6 is a schematic diagram of a lighting device including an organic EL element.
- a metal complex having the following general formula (1) or a tautomer of the general formula (1) as a partial structure, a tautomer of the following general formula (2) or the general formula (2) A metal complex having the following general formula (3) or a tautomer of the general formula (3) as a partial structure; a metal complex having the following general formula (4) or a general formula (4) )
- Z11 represents an atom group necessary for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- R 1, R 2 and R 3 each represent a hydrogen atom or a substituent.
- M is the periodic table of the elements
- Z21 represents an atom group necessary for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- R 1, R 2 and R 3 each represent a hydrogen atom or a substituent.
- M is the periodic table of the elements
- Z31 represents an atomic group necessary for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- X, ⁇ and ⁇ each represent a carbon atom or a nitrogen atom which may have a substituent.
- N (R) where at least two are nitrogen atoms or N (R) (where R is a hydrogen atom or
- C represents a carbon atom.
- M is group 8 in the periodic table
- Z41 represents an atom group necessary for forming an aromatic heterocyclic ring. X and X are replaced
- C 1, C 2 and C 3 each have a carbon atom
- M represents a metal belonging to Groups 8 to 10 in the periodic table.
- the bond between 41 42 41 42 41 43 42 43 represents a single bond or a double bond.
- Z51 represents an atomic group necessary for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- X represents an oxygen atom or a sulfur atom.
- R and R are a hydrogen atom or
- Z61 represents an atomic group necessary for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- X ⁇ represents a carbon atom or a nitrogen atom, each of which may have a substituent.
- ⁇ is group 8 to group 10 in the periodic table
- Z11 represents an atomic group necessary for forming an aromatic heterocyclic ring.
- the organic electroluminescent device material according to (2) which is characterized by the above-mentioned (2).
- the organic electroluminescent device material according to the above (1) which is a metal complex having the above-mentioned general formula (3) or a tautomer of the general formula (3) as a partial structure. Fees.
- the organic electroluminescent device according to the above (1) which is a metal complex having the above general formula (4) or a tautomer of the general formula (4) as a partial structure. Fees.
- the organic electroluminescent device according to the above (1) which is a metal complex having the above general formula (5) or a tautomer of the general formula (5) as a partial structure. Fees.
- M is S, iridium or platinum.
- M is S, iridium or platinum.
- M is S, iridium or platinum.
- X represents a carbon atom which may have a substituent
- X represents a nitrogen atom or —N (R) — (where R represents a hydrogen atom or a substituent).
- M is iridium or platinum.
- M is iridium or platinum.
- M is S, iridium or platinum.
- An organic electroluminescent device comprising the organic electroluminescent device according to any one of (1) to (21).
- hole blocking layer as a constituent layer, wherein the hole blocking layer contains the organic electroluminescent device material according to any one of (1) to (21).
- a light-emitting layer as a constituent layer wherein the light-emitting layer has a ring structure in which at least one of carbon atoms of a carboline derivative or a hydrocarbon ring constituting a carboline ring of the carboline derivative is substituted with a nitrogen atom.
- the organic electroluminescent device according to any one of the above items (22) to (25), further comprising a derivative having a ring structure.
- a display device comprising the organic electorescence luminescent element according to any one of (22) to (26).
- a lighting device comprising the organic electorophore luminescent element according to any one of (22) to (26).
- the composition defined in any one of the above (1) to (21) is used to molecularly design an organic EL device material useful for an organic EL device. It worked. Further, by using the organic EL element material, it was possible to provide an organic EL element, a lighting device, and a display device exhibiting high luminous efficiency and having a long luminous life.
- phenylviridine (a 6-membered ring and a 6-membered
- the mother nucleus of the compound represented by the general formulas (1) to (6) is represented by an aromatic hydrocarbon ring or an aromatic heterocyclic ring (preferably 6-membered). Ring) and an aromatic heterocyclic ring (preferably a 5-membered ring) are connected by a carbon-carbon bond or a carbon-nitrogen bond to form a metal complex having a specific partial structure.
- the present invention provides a molecular design for imparting a function of controlling the emission wavelength of a metal complex to a long-wave region by introducing a substituent having a long-wavelength emission wavelength as a substituent.
- the selection of an appropriate partial structure by using the basic skeleton of the general formulas (1) to (6) or each tautomer of the general formulas (1) to (6) as a starting point. Is possible.
- a layer containing a metal complex having a partial structure of the general formulas (1) to (6) or each of the tautomers of the general formulas (1) to (6) according to the present invention a light emitting layer And / or a hole-blocking layer is preferred.
- the compound when contained in the light-emitting layer, it can be used as a light-emitting dopant in the light-emitting layer to increase the efficiency of the external extraction quantum efficiency of the organic EL device of the present invention ( (Higher brightness) and a longer luminescent life.
- the aromatic hydrocarbon ring represented by Z11 includes a benzene ring, a biphenyl ring, a naphthalene ring, an azulene ring, an anthracene ring, and a phenanthrene ring.
- a benzene ring is preferably used.
- the aromatic hydrocarbon ring has a substituent represented by R 1, R 2, R 3 in the general formula (1) described below.
- the aromatic complex ring represented by Z11 includes a furan ring, a thiophene ring, a pyridine ring, a pyridazine ring, a pyrimidine ring, Pyrazine ring, triazine ring, benzimidazole ring, oxaziazole ring, triazole ring, imidazole ring, pyrazole ring, thiazole ring, indole ring, benzimidazole ring, benzothiazole ring, benzoxazole ring, quinoxaline ring, quinazoline ring, Examples include a phthalazine ring, a carbazole ring, a carboline ring, and a ring in which at least one of carbon atoms of a hydrocarbon ring constituting the carboline ring is further substituted with a nitrogen atom.
- a pyridine ring is preferable.
- the aromatic heterocyclic ring may have a substituent represented by R 1, R 2 and R 3 in the above-mentioned general formula (1).
- the ring represented by R11 is preferably an aromatic heterocyclic ring.
- the aromatic ring (corresponding to Z11 in the present invention) linked thereto is In the case of an aromatic heterocycle, the stability of the molecule is improved, and the emission wavelength is shorter.
- each is represented by R 1, R 2, and R 3.
- substituents include, for example, an alkyl group (for example, a methyl group, an ethyl group, an isopropylinole group, a hydroxyethyl group, a methoxymethinole group, a trifluoromethyl group, a t_butyl group, etc.), a cycloalkyl group (for example, , A cyclopentyl group, a cyclohexyl group, etc.), an aralkyl group (eg, a benzyl group, a 2-phenyl group, etc.), an aromatic hydrocarbon group (eg, a phenyl group, a p-chlorophenyl group, a mesityl group, a tolyl group, a xylyl group) Group, biphenylyl group, naphthyl group, anthryl group, phenanthryl group, etc.), aromatic heterocyclic group (for example, furyl group, chen,
- At least one of the groups represented by R 1, R 2 and R 3 is
- It is preferably an aromatic hydrocarbon group or an aromatic heterocyclic group.
- Platinum (Pt) and iridium (Ir) are preferably used among the powers representing metals of group 8 to 10 (which may be metal atoms or ions).
- M may be a metal.
- a coordination bond is formed (also called complex formation) with a core metal (which may be a metal or an ion) to form a metal complex.
- the aromatic hydrocarbon ring represented by Z21 is the same as the general formula (1) or the tautomer of the general formula (1).
- the aromatic complex ring represented by Z21 is the same as the general formula (1) or the tautomer of the general formula (1). In the body, it has the same meaning as the aromatic heterocyclic ring represented by Z11.
- R 1, R 2 and R 3 are each represented by
- the metals belonging to groups 8 to 10 in the table (which may be ions) are represented by M in the general formula (1) or a tautomer of the general formula (1).
- the aromatic hydrocarbon ring represented by Z31 is the same as the general formula (1) or the tautomer of the general formula (1).
- the aromatic complex ring represented by Z31 is the same as the general formula (1) or the tautomer of the general formula (1). In the body, it has the same meaning as the aromatic heterocyclic ring represented by Z11.
- each is represented by X 1, X 2 and X 3
- the substituent represented by R in N (R) is a group represented by the general formula (1) or a tautomer of the general formula (1).
- the metals belonging to groups 8 to 10 in the table (which may be ions) are represented by M in the general formula (1) or a tautomer of the general formula (1).
- X may have a substituent.
- X and X are nitrogen atoms or N (R) (where R is hydrogen atom or
- the aromatic complex ring represented by Z41 is represented by the general formula (1) or the tautomer of the general formula (1): It has the same meaning as the aromatic heterocyclic ring represented by Z11.
- R of N (R) _ is represented by the general formula (1) or a tautomer of the general formula (1). Has the same meaning as the substituents represented by R 1, R 2 and R 3.
- the metals belonging to groups 8 to 10 in the table (which may be ions) are represented by M in the general formula (1) or a tautomer of the general formula (1).
- the aromatic hydrocarbon ring represented by Z51 is the same as the general formula (1) or the tautomer of the general formula (1).
- the aromatic complex ring represented by Z51 is the same as the general formula (1) or the tautomer of the general formula (1). In the body, it has the same meaning as the aromatic heterocyclic ring represented by Z11.
- the substituents are each represented by R 1, R 2 and R 3 in the general formula (1) or a tautomer of the general formula (1).
- the metals belonging to groups 8 to 10 in the table (which may be ions) are represented by M in the general formula (1) or a tautomer of the general formula (1).
- X is a sulfur atom
- the aromatic hydrocarbon ring represented by Z61 is the same as the general formula (1) or the tautomer of the general formula (1). Has the same meaning as the aromatic hydrocarbon ring represented by Z11.
- an aromatic compound represented by Z61 The prime ring has the same meaning as that of the aromatic heterocyclic ring represented by Z11 in the general formula (1) or a tautomer of the general formula (1).
- the metals belonging to groups 8 to 10 in the table (which may be ions) are represented by M in the general formula (1) or a tautomer of the general formula (1).
- the metal complex according to the organic EL device material of the present invention is described in, for example, ⁇ rganic Le magazine, vol3 , No. 16, p2579 to 2581 (2001), Inorganic Chemistry, Vol . 30, Vol . 85 ⁇ : 1687 (1991),].
- the organic EL device When an organic EL device is produced using the organic EL device material of the present invention, it is preferable to use the organic EL device as a light emitting layer or a hole blocking layer among constituent layers of the organic EL device (details will be described later). .
- the light emitting layer it is preferably used as a light emitting dopant.
- the mixing ratio of the light-emitting host to the light-emitting host, which is the main component in the light-emitting layer, is preferably adjusted to 0.1% by mass to less than 30% by mass.
- the light emitting dopant may be a mixture of a plurality of types of compounds, and the mixing partner may have a different structure.
- Other metal complexes or phosphorescent dopants or fluorescent dopants having other structures may be used. Good.
- dopants phosphorescent dopants, fluorescent dopants, and the like
- metal complex used as the luminescent dopant
- the light-emitting dopant is roughly classified into two types, a fluorescent dopant that emits fluorescence and a phosphorescent dopant that emits phosphorescence.
- fluorescent dopant include coumarin-based dyes, pyran-based dyes, cyanine-based dyes, croconium-based dyes, squarium-based dyes, oxobenzanthracene-based dyes, fluorescein-based dyes, and rhodamine-based dyes And pyrylium dyes, perylene dyes, styrven dyes, polythiophene dyes, and rare earth complex fluorescent materials.
- a typical example of the latter is preferably a complex compound containing a metal belonging to Group 8, 9, or 10 of the periodic table of the elements, and more preferably an iridium compound or an iridium compound. Sumidium compounds are the most preferred, and iridium compounds are the most preferred.
- the light-emitting host used in the present invention is not particularly limited in structure, but is typically a carbazole derivative, a triarylamine derivative, an aromatic borane derivative, a nitrogen-containing complex ring compound, or thiophene.
- a carbazole derivative a triarylamine derivative, an aromatic borane derivative, a nitrogen-containing complex ring compound, or thiophene.
- a carboline derivative a diazaforce rubazole derivative and the like are preferably used.
- carboline derivative diazaforce rubazole derivative, and the like
- the present invention is not limited thereto. These compounds may be used as hole blocking materials.
- the luminescent host used in the present invention may be a low-molecular compound, a high-molecular compound having a repeating unit, or a low-molecular compound having a polymerizable group such as a vinyl group or an epoxy group (evaporation-polymerizable luminescent host). Les, Les ,.
- a compound which has a hole-transporting ability and an electron-transporting ability, prevents a longer wavelength of light emission, and has a high Tg (glass transition temperature) is preferable.
- the blocking layer for example, an electron blocking layer and a hole blocking layer
- the organic EL device material of the present invention is preferably used for the hole blocking layer, the electron blocking layer, and the like, particularly preferably for the hole blocking layer.
- the metal complex according to the present invention described in any one of Claims 1 to 17 is used as a hole.
- the blocking layer may be contained as a layer component of the electron blocking layer or the like in a state of 100% by mass, or may be another organic compound (for example, a compound used for a constituent layer of the organic EL device of the present invention). Etc. may be mixed.
- the thickness of the blocking layer according to the present invention is preferably from 3 nm to:! OO nm, and more preferably from 5 nm to 30 nm.
- the hole blocking layer has a function of an electron transport layer in a broad sense, and is made of a material having a function of transporting electrons and having a very small ability to transport holes, and blocking holes while transporting electrons. By doing so, the recombination probability of electrons and holes can be improved.
- the hole blocking layer examples include, for example, JP-A Nos. 11-204258 and 11-204359, and “Organic EL Devices and Their Forefront of Industrialization (N.T. Issue) ”on page 237 and the like can be used as the hole blocking layer according to the present invention. Further, the configuration of the electron transport layer described below can be used as a hole blocking layer according to the present invention, if necessary.
- Electron blocking layer >>
- the electron blocking layer has a function of a hole transport layer in a broad sense, and is made of a material having a function of transporting holes and having an extremely small ability to transport electrons. By blocking the electrons, the recombination probability of electrons and holes can be improved. Further, the configuration of the hole transport layer described later can be used as an electron blocking layer as needed.
- the organic EL device material of the present invention for the adjacent layer adjacent to the light emitting layer, that is, for the hole blocking layer and the electron blocking layer, particularly It is preferably used for a blocking layer.
- the hole transport layer includes a material having a function of transporting holes.
- a hole injection layer and an electron blocking layer are also included in the hole transport layer.
- the hole transport layer can be provided as a single layer or a plurality of layers.
- the hole transporting material is not particularly limited, and is conventionally used in photoconductive materials as a charge injecting and transporting material for holes and used as a hole injecting layer and a hole transporting layer in EL devices. Any known medium force can be selected and used.
- the hole transporting material has any of hole injection or transport and electron barrier properties, and may be an organic substance or an inorganic substance.
- triazole derivatives oxazidazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styryl anthracene derivatives, fluorenone derivatives And hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline-based copolymers, and conductive polymer oligomers, especially thiophene oligomers.
- the hole transporting material the above-mentioned materials can be used. It is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine compound, particularly an aromatic tertiary amine compound.
- aromatic tertiary amine compound and styrylamine compound include N, N, N ', N, 1-tetraphenyl-1,4,4'-diaminophenyl; N, ⁇ '-diphenyl-1N, ⁇ 1,1-bis (3-methylphenyl)-[1,1,1-biphenyl] -1,4,4-diamine (TPD); 2,2-bis (4-di- ⁇ -tolylaminophenyl) ) Propane; 1,1-bis (4-di- ⁇ -tolylaminophenyl) cyclohexane; ⁇ , ⁇ , ⁇ ', ⁇ , tetra- ⁇ -tolyl-1,4,4'-diaminobiphenyl; 1,1- Bis (4-di- ⁇ -tolylaminophenyl) -4-phenylcyclohexane; bis (4-dimethylamino-2-methylphenyl) phenylme
- a polymer material in which these materials are introduced into a polymer chain, or in which these materials are used as a polymer main chain, can also be used.
- inorganic compounds such as p-type-Si and p-type-SiC can be used as hole injection materials and hole transport materials.
- the hole transport material preferably has a high Tg.
- the hole transport layer is formed by thinning the hole transport material by a known method such as a vacuum deposition method, a spin coating method, a casting method, an inkjet method, and an LB method. That can be S.
- the thickness of the hole transport layer is not particularly limited, but is usually about 5 nm to 500 nm.
- the hole transport layer may have a single-layer structure composed of one or more of the above materials.
- the electron transport layer is made of a material having a function of transporting electrons.
- the electron transport layer includes an electron injection layer and a hole blocking layer.
- the electron transport layer can have a single layer or a plurality of layers.
- the electron transport material also serving as a hole blocking material
- the electron transport layer adjacent to the light emitting layer on the cathode side is as follows. The following materials are known.
- the electron transporting layer is not limited as long as it has a function of transmitting electrons injected from the cathode to the light emitting layer. Let's do it.
- Examples of the material used for the electron transport layer include a nitro-substituted fluorene derivative, a diphenylquinone derivative, a thiopyran dioxide derivative, and a naphthalene derivative.
- Examples include heterocyclic tetracarboxylic acid anhydrides such as phthalene perylene, phenolic imide, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, and oxaziazole derivatives.
- a thiadiazole derivative in which an oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can also be used as the electron transport material.
- a polymer material in which these materials are introduced into a polymer chain, or in which these materials are used as a polymer main chain, can also be used.
- a metal complex of an 8_quinolinol derivative for example, tris (8-quinolinol) aluminum (Alq), tris (5,7-dichloro-18-quinolinol) aluminum, tris (5,7-dibutanol) 8_quinolinol) aluminum, tris (2-methyl_8_quinolinol) aluminum, tris (5-methyl_8_quinolinol) aluminum, bis (8-quinolinol) zinc (Znq), etc.
- Metal complexes that replace In, Mg, Cu, Ca, Sn, Ga or Pb can also be used as electron transport materials.
- methanol-free or metal phthalocyanine or those whose terminals are substituted with an alkyl group ⁇ sulfonic acid group or the like can be preferably used as the electron transporting material.
- the distyryl virazine derivative exemplified as the material of the light emitting layer can be used as the electron transporting material, and like the hole injection layer and the hole transport layer, n-type—Si, n-type—SiC, etc.
- Inorganic semiconductors can also be used as electron transport materials.
- the electron transport layer is formed by thinning the electron transport material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an ink jet method, and an LB method. S can.
- the thickness of the electron transport layer is not particularly limited, but is usually about 5 to 5000 nm.
- the electron transport layer may have a single-layer structure made of one or more of the above materials.
- the injection layer is provided as necessary, and has an electron injection layer and a hole injection layer. It may be present between the light emitting layer or the hole transporting layer and between the cathode and the light emitting layer or the electron transporting layer.
- the injection layer is a layer provided between the electrode and the organic layer for lowering the driving voltage and improving the light emission luminance.
- the organic EL element and the forefront of its industrialization June 30, 1998, N.T. For details, refer to Vol. 2, Chapter 2 “Electrode Materials” (pages 123 to 166) of “Ess Co., Ltd.”.
- the anode buffer layer (hole injection layer) is also described in detail in JP-A-9-45479, JP-A-1260062, JP-A-8-288069, and the like.
- cathode buffer electro injection layer
- metal buffer represented by aluminum-aluminum
- alkali metal compound buffer represented by lithium fluoride
- alkaline earth metal compound buffer represented by magnesium fluoride
- oxide represented by aluminum oxide
- the buffer layer is an extremely thin film, and the thickness thereof is preferably in the range of 0.1 nm to 100 nm.
- This injection layer can be formed by thin-filming the above-mentioned material by a known method such as a vacuum evaporation method, a spin coating method, a casting method, an ink jet method, and an LB method.
- the thickness of the injection layer is not particularly limited, but is usually about 5 to 5000 nm.
- the injection layer may have a single-layer structure made of one or more of the above materials.
- a material having a large work function (4 eV or more), a metal, an alloy, an electrically conductive compound and a mixture thereof as an electrode material is preferably used.
- electrode materials include metals such as Au, Cul, and indium tin oxide.
- examples include conductive transparent materials such as Sido (ITO), SnO, and ⁇ . Also, IDIXO (In O-
- a material which can produce an amorphous and transparent conductive film such as Zn ( II) may be used.
- the anode is used to form a thin film by depositing these electrode materials by vapor deposition or sputtering, etc., and to form a pattern of a desired shape by one photolithography method. (about ⁇ m or more), and a pattern may be formed through a mask having a desired shape at the time of vapor deposition or sputtering of the electrode substance.
- the transmittance be greater than 10%
- the sheet resistance of the anode is preferably several hundred ⁇ / port or less.
- the film thickness is selected depending on the material, usually from 10 nm to: 1000 nm, preferably from 10 nm to 200 nm.
- a metal having a low work function (4 eV or less) (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof are used as an electrode material.
- electrode materials include sodium, sodium monolithium alloy, magnesium, lithium, magnesium / copper mixtures, magnesium / silver mixtures, magnesium / aluminum mixtures, magnesium / indium mixtures, aluminum / aluminum oxide (Al O) mixture, indium, lithium / aluminum mixture, rare
- a mixture of an electron injecting metal and a second metal which is a metal having a large work function and a stable value such as a magnesium / silver mixture, Magnesium / aluminium mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al 2 O 3) mixture
- the cathode can be manufactured by forming a thin film of these electrode materials by a method such as evaporation or sputtering.
- the sheet resistance of the cathode is preferably several hundreds of ohms or less, and the preferred film thickness is usually selected in the range of 10 nm to 1000 nm, preferably 50 nm to 200 nm.
- the anode S or the cathode S of the organic EL element is transparent or translucent or translucent, the light emission luminance is improved, which is advantageous.
- Substrate also referred to as substrate, substrate, support, etc.
- the substrate according to the organic EL device of the present invention is particularly suitable for glass, plastic, and the like.
- the substrate is transparent, but preferably used substrates include, for example, glass, quartz, and a light-transmitting resin film.
- a particularly preferred substrate is a resin film that can provide flexibility to the organic EL device.
- Examples of the resin film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyetherimide, polyether ether ketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate (PC),
- Examples of the film include cellulose triacetate (TAC) and cellulose acetate propionate (CAP).
- the surface of the resin film, an inorganic material or coating or High Priestess Tsu Yogu water vapor permeability even de coating is formed 0. 01g / m 2 'day' atm following high barrier for both the organic Preferably it is a film.
- the organic light-emitting device of the present invention has an external extraction efficiency at room temperature of preferably 1% or more, more preferably 2% or more.
- quantum efficiency taken out (%) number of photons emitted to the outside of the organic EL element / number of electrons flowing to the organic EL element ⁇ 100.
- a hue improvement filter such as a color filter may be used in combination.
- a film having a roughened surface (such as an anti-glare finolem) may be used in combination to reduce uneven light emission.
- a method for fabricating an organic EL device composed of a light-emitting layer, a hole blocking layer, an electron transport layer, a cathode buffer layer, and a cathode will be described.
- a thin film made of a desired electrode material for example, a material for an anode is formed on an appropriate substrate by a method such as evaporation or sputtering so as to have a thickness of 1 ⁇ m or less, preferably 10 nm to 200 nm.
- a thin film containing an organic compound such as a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, and an electron transport layer, which are element materials, is formed thereon. Let it run.
- Examples of the method of thinning the thin film containing the organic compound include a spin coating method, a casting method, an ink jet method, an evaporation method, and a printing method, as described above.
- the vacuum deposition method or the spin coating method is particularly preferable because a pinhole is not easily generated. Further, a different film forming method may be applied to each layer. If you use the film adopts the deposition, the deposition conditions vary due to kinds of materials used, generally baud preparative heating temperature 50 ° C ⁇ 450 ° C, vacuum degree of 10- 6 Pa ⁇ 10- 2 It is desirable to appropriately select a pressure within a range of Pa, a deposition rate of 0.01 nm to 50 nm / sec, a substrate temperature of 50 ° C. to 300 ° C., and a film thickness of 0.1 nm to 5 zm.
- a thin film made of a cathode material is formed thereon by a method such as evaporation or sputtering so as to have a thickness of 1 ⁇ m or less, preferably in the range of 50 nm to 200 nm.
- a desired organic EL device can be obtained by forming and providing a cathode. In the production of this organic EL device, it is preferable to produce from the hole injection layer to the cathode consistently by one evacuation, but it is also possible to take it out in the middle and apply a different film forming method. At that time, consideration must be given to performing the work in a dry inert gas atmosphere.
- the display device of the present invention will be described.
- the display device of the present invention may be monochromatic or multicolored.
- a multicolored display device will be described.
- a shadow mask is provided only when the light-emitting layer is formed, and a film can be formed on one surface by an evaporation method, a casting method, a spin coating method, an inkjet method, a printing method, or the like.
- the method is not particularly limited, but is preferably a vapor deposition method.
- the production order can be reversed, and the cathode, the electron transport layer, the hole blocking layer, the light emitting layer, the hole transport layer, and the anode can be produced in this order.
- the multicolor display device can be used as a display device, a display, and various light emission light sources.
- full-color display can be achieved by using three types of organic EL elements that emit blue, red, and green light.
- Examples of the display device and display include a television, a personal computer, a mopile device, an AV device, a character broadcast display, and information display in a car.
- the driving method may be either a simple matrix (passive matrix) method or an active matrix method.
- Light-emitting light sources include home lighting, car interior lighting, backlights for watches and LCDs, billboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copiers, light sources for optical communication processors, and light sensors.
- a light source or the like may be mentioned, but the light source is not limited thereto.
- the lighting device of the present invention will be described.
- the organic EL device of the present invention may be used as an organic EL device having a resonator structure, and the organic EL device having such a resonator structure may be used as a light source for an optical storage medium, an electronic device, or the like.
- laser oscillation may be used for the above purpose.
- the organic EL device of the present invention may be used as a kind of lamp such as an illumination light source or an exposure light source, a projection device of an image projection type, or a still image or a moving image. It can be used as a display device that can be viewed directly.
- the drive method can be either a simple matrix (passive matrix) method or an active matrix method.
- a full-color display device can be manufactured by using two or more kinds of the organic EL elements of the present invention having different emission colors.
- FIG. 1 is a schematic diagram showing an example of a display device including an organic EL element.
- FIG. 2 is a schematic view of a display such as a mobile phone for displaying image information by light emission of an organic EL element.
- the display 1 includes a display unit A having a plurality of pixels, a control unit B that performs image scanning of the display unit A based on image information, and the like.
- the control unit B is electrically connected to the display unit A, sends a scanning signal and an image data signal to each of a plurality of pixels based on image information from the outside, and controls the pixels for each scanning line by the scanning signal. , Sequentially emit light according to the image data signal, perform image scanning, and display image information on the display unit A.
- FIG. 2 is a schematic diagram of the display unit A.
- the display section A has a wiring section including a plurality of scanning lines 5 and data lines 6 and a plurality of pixels 3 on a substrate.
- the main members of the display unit A will be described below.
- the figure shows a case where the light emitted from the pixel 3 is extracted in the white arrow direction (downward).
- the scanning line 5 and the plurality of data lines 6 in the wiring portion are each made of a conductive material, and the scanning line 5 and the data line 6 are orthogonal to each other in a grid pattern, and are connected to the pixels 3 at orthogonal positions ( Details are not shown).
- the pixel 3 When a scanning signal is applied from the scanning line 5, the pixel 3 receives an image data signal from the data line 6, and emits light in accordance with the received image data.
- the pixel 3 By properly arranging pixels in the red, green, and blue light emission regions on the same substrate, full color display is possible.
- FIG. 3 is a schematic diagram of a pixel.
- the pixel includes an organic EL device 10, a switching transistor 11, a driving transistor 12, a capacitor 13, and the like. Red, green, and blue light emitting organic EL elements are used as the organic EL elements 10 for a plurality of pixels, and full-color display is performed by juxtaposing these on the same substrate. I can.
- an image data signal is applied from the control unit B to the drain of the switching transistor 11 via the data line 6. Then, when a scan signal is applied from the control unit B to the gate of the switching transistor 11 via the scanning line 5, the drive of the switching transistor 11 is turned on, and the image data signal applied to the drain is driven by the capacitor 13 It is transmitted to the gate of transistor 12.
- the capacitor 13 is charged according to the potential of the image data signal, and the driving of the driving transistor 12 is turned on.
- the drive transistor 12 has a drain connected to the power supply line 7, a source connected to the electrode of the organic EL element 10, and an organic EL element connected from the power supply line 7 according to the potential of the image data signal applied to the gate. Element 10 is supplied with current.
- the organic EL element 10 emits light by providing a switching transistor 11 and a driving transistor 12 as active elements for the organic EL elements 10 of each of the plurality of pixels, and The element 10 emits light.
- a light emitting method is called an active matrix method.
- the light emission of the organic EL element 10 may be light emission of a plurality of gradations by a multi-valued image data signal having a plurality of gradation potentials, or light emission of a predetermined light emission amount by a binary image data signal. It may be on or off.
- the potential of the capacitor 13 may be maintained until the next scan signal is applied, or may be discharged immediately before the next scan signal is applied. ,.
- the running signal is not limited to the above-described active matrix system.
- a passive matrix light emission drive in which the organic EL element emits light in accordance with the data signal only when the light is emitted may be used.
- FIG. 4 is a schematic diagram of a display device using a passive matrix method.
- a plurality of scanning lines 5 and a plurality of image data lines 6 are provided in a lattice shape so as to face each other with the pixel 3 interposed therebetween.
- the pixels 3 connected to the applied scan line 5 emit light according to the image data signal.
- the manufacturing cost can be reduced.
- the organic EL material according to the present invention can also be applied to an organic EL element that emits substantially white light as a lighting device.
- a plurality of light emitting colors are emitted simultaneously by a plurality of light emitting materials, and white light is obtained by mixing colors.
- white light is obtained by mixing colors.
- a combination of a plurality of emission colors a combination of three emission maximum wavelengths of the three primary colors of blue, green and blue may be used, or a combination of complementary colors such as blue and yellow, and blue-green and orange may be used. It may be one containing two emission maximum wavelengths.
- the combination of light-emitting materials for obtaining a plurality of emission colors includes a combination of a plurality of phosphorescent or fluorescent light-emitting materials (light-emitting dopants) and a fluorescent or phosphorescent light-emitting material.
- a combination of a dye material that emits light with the light of the light emitting material as excitation light and a good displacement can be achieved
- the white organic electorophore luminescent device according to the present invention employs a method of combining a plurality of luminescent dopants. preferable.
- the layer structure of the organic electroluminescent device for obtaining a plurality of luminescent colors includes a method in which a plurality of luminescent dopants are present in a single luminescent layer, and a method in which a plurality of luminescent layers are provided. Examples include a method in which dopants having different emission wavelengths are present in the layer, and a method in which minute pixels that emit light with different wavelengths are formed in a matrix.
- a patterning may be performed by a metal mask, an inkjet printing method, or the like at the time of film formation, if necessary.
- the electrode When patterning is performed, only the electrode may be patterned, or the electrode and the light emitting layer may be patterned or checked, and the entire element layer may be patterned or checked.
- the light emitting material used for the light emitting layer is not particularly limited.
- the light emitting material is suitable for a wavelength range corresponding to CF (color filter) characteristics.
- the platinum complex according to the present invention or any of known luminescent materials may be selected and combined to whiten.
- the white light-emitting organic EL element of the present invention can be used as a kind of light source and lighting device such as home lighting, in-car lighting, and exposure light as a light source for the display device and display.
- a lamp it is usefully used for a display device such as a backlight of a liquid crystal display device.
- a backlight such as a clock, a signboard advertisement, a traffic light, a light source such as an optical storage medium, a light source of an electronic photocopier, a light source of an optical communication processor, a light source of an optical sensor, and a display device are required.
- a wide range of applications such as general household electric appliances.
- the transparent support substrate provided with the ITO transparent electrodes was ultrasonically cleaned with isopropyl alcohol. Then, drying with dry nitrogen gas was performed, and UV ozone cleaning was performed for 5 minutes.
- This transparent support substrate is fixed to the substrate holder of a commercially available vacuum evaporation system, while _NPD, CBP, Ir_12, BCP, and Alq are placed in five tantalum resistance heating boats, respectively, and the vacuum evaporation system ( (First vacuum chamber).
- lithium fluoride was placed in a tantalum resistance heating boat, and aluminum was placed in a tungsten resistance heating boat, and they were attached to a second vacuum chamber of a vacuum evaporation apparatus.
- the heating boat containing CBP and the boat containing Ir12 are independently passed through, and the deposition rate of CBP as a light emitting host and Ir-12 as a light emitting dopant becomes 100: 7. This was adjusted to a thickness of 30 nm to provide a light emitting layer.
- the heating boat containing the BCP was energized and heated, and the deposition rate was set to 0.1 lm / sec.
- a hole blocking layer having a thickness of lOnm at 0.2 nm / sec was provided.
- the sheet was heated by energization, and an electron transport layer having a thickness of 40 nm was provided at a deposition rate of 0.1 nm / sec to 0.2 nm / sec.
- a cathode buffer steam Chakusokudo 0. OlnmZ sec ⁇ 0. 02nmZ seconds at a film thickness of 0. 5 nm by supplying an electric current to the boat lithium fluoride-containing One layer was provided, and then a boat containing aluminum was energized to apply a 150 nm-thick cathode at a deposition rate of 1 nm / sec to 2 nmZ seconds.
- the organic EL element was transferred to a glove box (a glove box replaced with a high-purity nitrogen gas having a purity of 99.999% or more) in a nitrogen atmosphere without being brought into contact with the atmosphere.
- the organic EL element OLED1-1 was fabricated with the sealing structure replaced by.
- Barium oxide 105 a water-trapping agent, is made of a high-purity barium oxide powder manufactured by Aldrich Co., Ltd. using a fluororesin semi-permeable membrane with adhesive (Microtex S-NTF8031Q manufactured by Nitto Denko). What was pasted on the sealing can 104 was prepared and used in advance. The sealing can was bonded to the organic EL element by using an ultraviolet-curing adhesive 107 and irradiating an ultraviolet lamp to bond the two together to produce a sealing element.
- 101 is a glass substrate provided with a transparent electrode
- 102 is an organic EL layer including the above-described hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer
- 103 is a cathode.
- organic EL element OLED1-1 As shown in Table 1, the organic EL elements OLED1-2 to OLED1-2 to luminescent host, luminescent dopant and hole blocking material were changed in the same manner, respectively. : 1-24 were prepared.
- the organic EL element OLED1-1 to 1-24 is lit at room temperature (about 23 ° C to 25 ° C) at a constant current of 2.5 mA / cm 2 , and the light emission luminance (U [cd / m 2 ] Thereby, the external extraction quantum efficiency (77) was calculated.
- the measurement of the light emission luminance used CS1000 made by Minolta).
- the external extraction quantum efficiency was expressed as a relative value when the organic EL element OLED1-1 was set to 100.
- the light emission lifetime was expressed as a relative value when the organic EL element OLED1-1 was set to 100.
- a carboline derivative or a carbon atom constituting the carboline ring of the carboline derivative When a derivative having a ring structure in which at least one of carbon atoms of a hydrogen ring is further substituted with a nitrogen atom is used in combination with the light emitting layer, a carboline derivative or a hydrocarbon ring constituting the carboline ring of the carbine derivative is used.
- a derivative having a ring structure in which at least one of the carbon atoms is further substituted with a nitrogen atom for the hole blocking layer the effect described in the present invention was further improved.
- the transparent support substrate provided with the ITO transparent electrodes was ultrasonically cleaned with isopropyl alcohol. Then, drying with dry nitrogen gas was performed, and UV ozone cleaning was performed for 5 minutes.
- the transparent support substrate was fixed to a substrate holder of a commercially available vacuum evaporation apparatus, while a-NPD, CBP, Ir-12, BCP, and Alq were placed in five tantalum resistance heating boats, respectively. It was attached to a vacuum evaporation system (first vacuum tank).
- lithium fluoride was placed in a resistance heating boat made of tantalum and aluminum was placed in a resistance heating boat made of tungsten, and they were attached to a second vacuum tank of a vacuum evaporation apparatus.
- the heating boat containing CBP and the boat containing Ir12 are independently passed through, and the deposition rate of CBP as a light emitting host and Ir-12 as a light emitting dopant becomes 100: 7. This was adjusted to a thickness of 30 nm to provide a light emitting layer.
- the heating boat containing the BCP was energized and heated, and the evaporation rate was set to 0. InmZ seconds.
- a hole blocking layer having a thickness of 10 nm and a thickness of 0.2 nmZ seconds was provided. Further, the heating boat containing Alq was energized and heated to provide an electron transport layer having a thickness of 30 nm at a deposition rate of 0.1 nm / sec to 0.2 nmZ second.
- barium oxide 105 which is a water trapping agent, is obtained by coating a high-purity barium oxide powder manufactured by Anoredrich Co. with a fluororesin semi-permeable membrane with an adhesive (Microtex
- S-NTF8031Q (manufactured by Nitto Denko), which was attached to a glass sealing can 104, was used in advance as a preparation.
- the sealing can was bonded to the organic EL element by using an ultraviolet-curing adhesive 107 and irradiating an ultraviolet lamp to bond the two together to produce a sealing element.
- 101 is a glass substrate provided with a transparent electrode
- 102 is an organic EL layer composed of the hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer, etc.
- 103 is a cathode.
- the organic EL elements OLED2-2 to 2-2 were prepared in the same manner except that the light-emitting host, the light-emitting dopant and the hole-blocking material were respectively changed. — 19 was made.
- the external extraction quantum efficiency was represented by a relative value when the organic EL element OLED2-1 was set to 100, and the light emission life was represented by a relative value when the organic EL element OLED2-1 was set to 100.
- the transparent support substrate provided with this ITO transparent electrode was ultrasonically treated with iso-propyl alcohol. Wash, dry with dry nitrogen gas, and perform UV ozone cleaning for 5 minutes.
- This transparent support substrate was fixed to a substrate holder of a commercially available vacuum evaporation apparatus, while m-MTDATXA, Hl, Ir-12, BCP, and Alq were each placed in five tantalum resistance heating boats. , And attached to a vacuum evaporation system (first vacuum tank).
- lithium fluoride was placed in a resistance heating boat made of tantalum and aluminum was placed in a resistance heating boat made of tungsten, and they were attached to a second vacuum tank of a vacuum evaporation apparatus.
- the heating boat containing HI and the boat containing Ir_12 are independently conducted, and the deposition rate of HI as the light emitting host and Ir-12 as the light emitting dopant becomes 100: 7. This was adjusted to a thickness of 30 nm, and a light emitting layer was provided.
- the heating boat containing the BCP was energized and heated to provide a hole blocking layer having a thickness of 10 nm at a deposition rate of 0.2 to 0.2 nm / sec. Further, the heating boat containing Alq was heated by being energized to provide an electron transporting layer having a thickness of 20 nm at a deposition rate of 0.1 nm / sec to 0.2 nm / sec.
- the organic EL element OLED3-1 was fabricated with the sealing structure replaced by.
- Barium oxide 105 a water-trapping agent, is made of high-purity barium oxide powder manufactured by Aldrich Co., Ltd., and sealed with a fluororesin semi-permeable membrane with adhesive (Mikuguchi Tex S-NTF8031Q manufactured by Nitto Denko). What was pasted on the can 104 was prepared in advance and used. UV curable adhesive for bonding cans and organic EL devices 1 Using 07, the two were adhered by irradiating an ultraviolet lamp to form a sealing element.
- 101 is a glass substrate provided with a transparent electrode
- 102 is an organic EL layer composed of the hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer, etc.
- 103 is a cathode.
- the organic EL devices OLED3-2 to 3 _23 were produced in the same manner except that the luminescent dopant and the hole blocking material were changed.
- An organic EL device was prepared in the same manner as in Example 3 except that the deposition rate of HI as a light-emitting host and Ir-12 as a light-emitting dopant was changed from 100: 7 to 100: 4 in forming the light-emitting layer in Example 3. OLED4-1 was created.
- Organic EL element OLED4— Lights up! ⁇ 4_19 at room temperature (about 25 to 25 °, constant current of 2.5 mA / cm 2 , and emission luminance immediately after starting lighting (U [cd / m 2 ]
- the external extraction quantum efficiency () was calculated by measuring, where the emission luminance was measured using CS — 1000 (manufactured by Minolta), and the external extraction quantum efficiency was measured using the organic EL element OLED 4 — It was expressed as a relative value when 1 was taken as 100.
- Organic EL device 1 ⁇ : 04_1 to 4_19 are continuously lit at room temperature under a constant current condition of 2.5 mA / cm 2 , and the time required to reach half the initial luminance ( ⁇ /)
- the light emission life was expressed as a relative value with the organic EL element OLED4-1 as 100.
- the organic EL device manufactured using the metal complex according to the present invention can achieve higher luminous efficiency and longer luminescent life than the comparative organic EL device.
- a carboline derivative or a derivative having a ring structure in which at least one carbon atom of a hydrocarbon ring constituting the carboline ring of the carboline derivative is further substituted with a nitrogen atom in the light emitting layer.
- the use of a derivative or a derivative having a ring structure in which at least one of the carbon atoms of the hydrocarbon ring constituting the carboline ring of the carboline derivative is further substituted with a nitrogen atom for the hole blocking layer further enhances the present invention. The described effect was improved.
- the transparent support substrate provided with the ITO transparent electrodes was ultrasonically cleaned with iso-propyl alcohol. Then, dry with dry nitrogen gas and perform UV ozone cleaning for 5 minutes.
- the transparent support substrate was fixed to a substrate holder of a commercially available vacuum evaporation apparatus, while five tantalum resistance heating boats were charged with m-MTDATXA, Hl, Ir-12, BCP, and Alq.
- lithium fluoride was placed in a resistance heating boat made of tantalum, and aluminum was placed in a resistance heating boat made of tungsten, and they were attached to a second vacuum tank of a vacuum evaporation apparatus.
- the heating boat containing HI and the boat containing Ir_12 were independently passed, and the deposition rate of HI as the light emitting host and Ir-12 as the light emitting dopant became 100: 7. This was adjusted to a thickness of 30 nm, and a light emitting layer was provided.
- the heating boat containing the BCP was energized and heated, and the evaporation rate was set to 0. InmZ seconds.
- a hole blocking layer having a thickness of 10 nm was provided at a thickness of 0.2 nm / sec. Further, the heating containing Alq
- the boat was energized and heated to provide an electron transport layer with a thickness of 30 nm at a deposition rate of 0.1 nm / sec to 0.2 nm / sec.
- barium oxide 105 a water-trapping agent
- barium oxide 105 a water-trapping agent
- a high-purity barium oxide powder manufactured by Aldrich Co., Ltd. with a fluororesin semi-permeable membrane (Microtex S-NTF8031Q manufactured by Nitto Denki) with an adhesive.
- What was pasted on the sealing can 104 was prepared and used in advance.
- the UV-curable adhesive 107 was used for bonding the EL device, and both were adhered by irradiating an ultraviolet lamp to produce a sealing element.
- reference numeral 101 denotes a glass substrate provided with a transparent electrode
- 102 denotes an organic EL layer including the above-described hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer
- 103 denotes a cathode.
- organic EL devices OLED5-2 to 5_25 were produced.
- Organic EL element OLED5 Continuous lighting of! To 5-25 at room temperature under a constant current of 2.5 mA / cm2, and the time required to reach 90% of the initial luminance ( ⁇ / )
- the external extraction quantum efficiency was expressed as a relative value when the organic EL element OLED5-1 was set to 100, and the emission life was expressed as a relative value when the organic EL element OLED5-1 was set to 100.
- the organic EL device manufactured using the metal complex according to the present invention can achieve higher luminous efficiency and longer luminescent life than the comparative organic EL device.
- a carboline derivative or a derivative having a ring structure in which at least one carbon atom of a hydrocarbon ring constituting the carboline ring of the carboline derivative is further substituted with a nitrogen atom in the light emitting layer.
- the use of a derivative or a derivative having a ring structure in which at least one of the carbon atoms of the hydrocarbon ring constituting the carboline ring of the carboline derivative is further substituted with a nitrogen atom for the hole blocking layer further enhances the present invention. The described effect was improved.
- the organic EL element OLED6_2_6 was prepared in the same manner except that the light emitting host, the light emitting dopant, and the hole blocking material were respectively changed. 20 were produced. Evaluation was performed in the same manner as in Example 1 for the obtained organic EL element OLED6 — 16 — 20 and for the external extraction quantum efficiency.
- the organic EL element OLED6 :: 6-20 is continuously lit at 25 ° C at a constant current of 2.5 mA / cm 2 , and the initial drive voltage of the drive voltage when the brightness reaches half of the initial brightness The rise from pressure was measured.
- the organic EL device manufactured using the metal complex according to the present invention can achieve higher luminous efficiency and lower voltage rise than the comparative organic EL device.
- a derivative having a ring structure in which at least one of carbon atoms of a carboline derivative or a hydrocarbon ring constituting a carboline ring of the carboline derivative is further substituted with a nitrogen atom.
- the use of the compound in the light-emitting layer allows the carboline derivative or a derivative having a ring structure in which at least one of the carbon atoms of the hydrocarbon ring constituting the carboline ring of the carboline derivative is further substituted with a nitrogen atom to be a hole.
- Use of the blocking layer further improved the effects described in the present invention.
- the organic EL element OLED1-7 of Example 1 was used as a blue light emitting element.
- Ir_l was used as a green light emitting device.
- Ir_9 was used as a red light emitting element.
- a wiring portion including a plurality of scanning lines 5 and data lines 6 and a plurality of juxtaposed pixels 3 (pixels in a red region, pixels in a green region, pixels in a blue region, etc.)
- the scanning lines 5 and the plurality of data lines 6 of the wiring portion are each made of a conductive material, and the scanning lines 5 and the data lines 6 are orthogonal to each other in a grid and are connected to the pixels 3 at orthogonal positions. (Details not shown).
- the plurality of pixels 3 are driven by an active matrix method including an organic EL element corresponding to each emission color, a switching transistor as an active element, and a driving transistor, and a scanning signal from a scanning line 5. When applied, it receives an image data signal from the data line 6 and emits light according to the received image data.
- a full-color display device was manufactured by juxtaposing the red, green, and blue pixels as appropriate.
- a full-color display device was produced in the same manner as in the production of the blue light-emitting device of Example 7, except that the organic EL elements OLED1-7 were changed to the organic EL elements OLED2-7.
- the organic EL device OLED1-7 was replaced with the organic EL device OLED3-4.
- a full-color display device was produced in the same manner except that the above was changed.
- a full-color display device was fabricated in the same manner as in the fabrication of the blue light-emitting device of Example 7, except that the organic EL devices OLED1-7 were changed to the organic EL devices OLED4-4.
- a full-color display device was produced in the same manner as in the production of the blue light-emitting device of Example 7, except that the organic EL elements OLED1-7 were changed to the organic EL elements OLED5-4.
- a full-color display device was produced in the same manner as in the production of the blue light-emitting device of Example 7, except that the organic EL elements OLED1-7 were changed to the organic EL elements OLED6-5.
- the device By driving the full-color display device, the device has high durability with high luminance, and It was found that a clear full-color moving image display could be obtained.
- the electrode of the transparent electrode substrate of Example 1 was patterned into 20 mm X 20 mm, and a single NPD was formed thereon as a hole injection / transport layer with a thickness of 25 nm as in Example 1;
- the above-mentioned heated boat containing CBP, the boat containing Compound 1-5 of the present invention, and the boat containing Ir_9 are supplied with current independently, and CBP as a light-emitting host and Compounds 1_5 and Ir_5 as light-emitting dopants of the present invention.
- the deposition rate of 9 was adjusted so as to be 100: 5: 0.6, and the deposition was performed so as to have a thickness of 30 nm, thereby providing a light emitting layer.
- a hole blocking layer was provided by forming a film of BCP to a thickness of 10 nm. Further, a film of Alq was formed at a thickness of 40 nm to provide an electron transport layer.
- Example 2 a square perforated mask having substantially the same shape as the transparent electrode made of stainless steel was placed on the electron injection layer, and lithium fluoride 0.5 nm and the cathode were used as a cathode buffer layer.
- lithium fluoride 0.5 nm and the cathode were used as a cathode buffer layer.
- Fig. 6 shows a schematic diagram of a flat lamp.
- Fig. 6 (a) shows a schematic plan view and Fig. 6 (b) shows a schematic cross-sectional view.
- a white lighting device was manufactured in the same manner as in Example 13, except that the compound of the present invention 1-5 was changed to 2-7 in the manufacture of the white light-emitting device of Example 13.
- Example 13 In preparation of the white light emitting device of Example 13, the present compound 115 was changed to 3-2. A white lighting device was produced in the same manner as in Example 13 except for the above.
- a white lighting device was manufactured in the same manner as in Example 13, except that Compounds 1-5 were changed to 4-4 in the preparation of the white light-emitting device of Example 13.
- a white light emitting device was produced in the same manner as in Example 13, except that Compound 1_5 was changed to 5-1 in preparation of the white light-emitting element of Example 13.
- a white light device was produced in the same manner as in Example 13 except that Compound 15 was changed to 6-5 in preparation of the white light-emitting device of Example 13.
- Organic EL devices OLED7— :! to 7-13 were prepared in the same manner as in Example 1, except that the light emitting dopant was changed to Ir_l and the hole blocking material was changed as shown in Table 7.
- the light colors were all green.
- an organic EL device material useful for an organic EL device is obtained.
- the emission wavelength is controlled, high luminous efficiency is exhibited, and the luminescent lifetime is improved.
- a long organic EL element, a lighting device, and a display device can be provided.
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Cited By (538)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007029466A1 (ja) * | 2005-09-06 | 2007-03-15 | Konica Minolta Holdings, Inc. | 有機エレクトロルミネッセンス素子、表示装置及び照明装置 |
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