WO2022181197A1 - 有機el素子用材料、有機el素子、表示装置および照明装置 - Google Patents
有機el素子用材料、有機el素子、表示装置および照明装置 Download PDFInfo
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- 239000011780 sodium chloride Substances 0.000 description 1
- VPQBLCVGUWPDHV-UHFFFAOYSA-N sodium selenide Chemical compound [Na+].[Na+].[Se-2] VPQBLCVGUWPDHV-UHFFFAOYSA-N 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001981 tert-butyldimethylsilyl group Chemical group [H]C([H])([H])[Si]([H])(C([H])([H])[H])[*]C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000037 tert-butyldiphenylsilyl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1[Si]([H])([*]C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- PCCVSPMFGIFTHU-UHFFFAOYSA-N tetracyanoquinodimethane Chemical class N#CC(C#N)=C1C=CC(=C(C#N)C#N)C=C1 PCCVSPMFGIFTHU-UHFFFAOYSA-N 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 150000007979 thiazole derivatives Chemical class 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 150000003577 thiophenes Chemical class 0.000 description 1
- NZFNXWQNBYZDAQ-UHFFFAOYSA-N thioridazine hydrochloride Chemical class Cl.C12=CC(SC)=CC=C2SC2=CC=CC=C2N1CCC1CCCCN1C NZFNXWQNBYZDAQ-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OVTCUIZCVUGJHS-VQHVLOKHSA-N trans-dipyrrin Chemical class C=1C=CNC=1/C=C1\C=CC=N1 OVTCUIZCVUGJHS-VQHVLOKHSA-N 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 125000004306 triazinyl group Chemical group 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- PWYVVBKROXXHEB-UHFFFAOYSA-M trimethyl-[3-(1-methyl-2,3,4,5-tetraphenylsilol-1-yl)propyl]azanium;iodide Chemical compound [I-].C[N+](C)(C)CCC[Si]1(C)C(C=2C=CC=CC=2)=C(C=2C=CC=CC=2)C(C=2C=CC=CC=2)=C1C1=CC=CC=C1 PWYVVBKROXXHEB-UHFFFAOYSA-M 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
- C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
- C07D471/04—Ortho-condensed systems
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/6574—Polycyclic condensed heteroaromatic hydrocarbons comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/658—Organoboranes
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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]
- H10K50/14—Carrier transporting layers
- H10K50/16—Electron transporting layers
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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]
- H10K50/17—Carrier injection layers
- H10K50/171—Electron injection layers
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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]
- H10K50/19—Tandem OLEDs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
Definitions
- the present invention relates to an organic EL element material having a specific structure, and an organic EL element, display device and lighting device using the same.
- organic EL elements have been steadily put into practical use, such as being used in TV and smartphone displays.
- existing organic EL devices still have many technical problems. Among them, achieving both highly efficient light emission and extending the life of the organic EL element is a major issue.
- phenanthroline derivatives having a terpyridine skeleton and substituted with a specific aryl group see, for example, Patent Document 1
- phenanthroline derivatives having a pyrene skeleton see, for example, Patent Document 2
- phenanthroline derivatives having a dibenzofuran skeleton see, for example, Patent Documents 3 and 4
- phenanthroline derivatives having a specific arylene group and heteroaryl group see, for example, Patent Document 5
- Patent Documents 1 to 5 phenanthroline derivatives linked with a terpyridine skeleton, a pyrene skeleton, a dibenzofuran skeleton, a specific aryl group, an arylene group, or a heteroaryl group are used to increase luminous efficiency, enable low-voltage driving, and improve durability.
- An excellent organic EL device can be obtained.
- the luminous efficiency and durability required for organic EL elements have been increasing more and more, and there is a demand for a technique that achieves both higher luminous efficiency and durable life.
- An object of the present invention is to provide an organic EL device that is excellent in luminous efficiency and durability in view of the problems of the prior art.
- the present invention is an organic EL device material represented by the following general formula (1).
- any one of X 1 to X 3 is a nitrogen atom, and the others are methine groups.
- L 1 is a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group or a substituted or unsubstituted anthrylene group
- L 2 is a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group or a substituted or unsubstituted anthrylene group.
- the substituents are alkyl groups or alkoxy groups.
- A is a phenyl group or a pyridyl group, n is 0 or 1;
- the present invention can provide an organic EL device with excellent luminous efficiency and durable life.
- Organic EL device material represented by general formula (1) which is one embodiment of the present invention, comprises a phenanthroline derivative shown below, and is used in any one of the layers constituting the organic EL device. represents the material used.
- the organic EL device material means the application of the phenanthroline derivative represented by the following general formula (1).
- any one of X 1 to X 3 is a nitrogen atom, and the others are methine groups.
- L 1 is a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group or a substituted or unsubstituted anthrylene group
- L 2 is a single bond, a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group or a substituted or unsubstituted anthrylene group.
- the substituents are alkyl groups or alkoxy groups.
- A is a phenyl group or a pyridyl group, n is 0 or 1;
- the alkyl group is, for example, a saturated aliphatic hydrocarbon group such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, which is a substituent may or may not have
- the number of carbon atoms in the alkyl group is not particularly limited, it is usually in the range of 1 to 20, more preferably 1 to 8 in terms of availability and cost.
- the alkoxy group is a group in which an alkyl group is bonded to oxygen, such as a methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group, tert-butoxy group, It may or may not have a substituent.
- the number of carbon atoms in the alkoxy group is not particularly limited, it is usually in the range of 1 to 20, more preferably 1 to 8 in terms of availability and cost.
- Patent Documents 1 to 5 disclose compounds V, W, X, Y, and Z represented by the following formulas. .
- a compound in which a phenanthrolinyl group is substituted with a pyrenyl group has a bulky substituent near the nitrogen atom on the highly coordinating phenanthrolinyl group. It tends to reduce the coordinating ability of the group to the metal atom. Therefore, when the compound V is used together with the metal atom, the film stability is lowered, the driving voltage is increased, and the luminous efficiency and the durable life are lowered.
- Compounds having a bulky aromatic substituent on the linking group between the terpyridyl group and the phenanthrolinyl group such as compounds W and Y, are less effective in improving molecular interaction due to their bulkiness.
- a compound in which a terpyridyl group and a phenanthrolinyl group are linked by a dibenzofuranylene group, such as compound X, has too high crystallinity due to the high planarity of the phenanthrolinyl group and the linking group.
- the voltage became higher, and there were problems with luminous efficiency and durability.
- the present inventors focused on the effects of a phenanthrolinyl group, a terpyridyl group, and their linking groups in the study of improving materials for organic EL devices. Both the phenanthrolinyl group and the terpyridyl group have a large electron-transporting property and are highly coordinating groups to metal atoms.
- the organic EL device material represented by the general formula ( 1 ) is produced by selecting a phenylene group, a naphthylene group or an anthrylene group as L1 and a single bond, a phenylene group, a naphthylene group or an anthrylene group as L2. , a phenanthrolinyl group, a terpyridyl group, and their linking groups can be easily conjugated to increase the charge transportability of the compound as a whole. Therefore, when used in an organic EL element, the driving voltage can be reduced and the luminous efficiency can be improved.
- the organic EL element material represented by the general formula (1) when used for the metal-doped layer in the organic EL element, a stable layer is formed. be able to.
- the metal-doped layer means a layer obtained by doping any of the layers constituting the organic EL element with a metal.
- the organic EL device material represented by the general formula (1) when used for the electron transport layer, the electron injection layer or the charge generation layer, these layers exhibit more stable and excellent performance.
- L 1 is a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthylene group or a substituted or unsubstituted anthrylene group
- L 2 is a single bond, a substituted or unsubstituted phenylene group, It is a substituted or unsubstituted naphthylene group or a substituted or unsubstituted anthrylene group.
- the substituent when L 1 is substituted is an alkyl group or an alkoxy group. These substituents are preferable because they can improve the stability of the compound without reducing the charge transport property of the compound.
- L 1 or L 2 is preferably a naphthylene group from the viewpoint of enhancing film quality stability and further improving luminous efficiency and durable life. Moreover, when L2 is a single bond, the interaction between the phenanthrolinyl group and the terpyridyl group can be increased, and the luminous efficiency and durability can be further improved.
- any one of X 1 to X 3 is a nitrogen atom, and the others are methine groups.
- X 3 is preferably a nitrogen atom from the viewpoint of enhancing coordination with the metal atom and forming a more stable layer. By forming a more stable layer, it is possible to drive at a low voltage and further improve the durability life.
- A is a phenyl group or a pyridyl group.
- n the highly reactive 2- and 9-positions among the substitution positions of phenanthroline are substituted, so that the stability of the compound can be improved.
- A is preferably a phenyl group from the viewpoint of enhancing the stability and durability of the device.
- n when n is 0, position 9 of phenanthroline is hydrogen. When n is 0, phenanthroline is sterically unoccupied, so that when used in a metal-doped layer, a more stable layer with higher metal coordination can be formed.
- the molecular weight of the organic EL device material represented by general formula (1) is preferably 400 or more.
- the molecular weight of the organic EL element material represented by the general formula (1) is preferably 640 or less from the viewpoint of improving workability during sublimation purification and vapor deposition.
- Examples of the organic EL element material represented by the general formula (1) include compounds composed of the compounds shown below. The following are examples, and compounds other than those specified here can also be preferably used as long as they are represented by the general formula (1).
- the organic EL element material represented by general formula (1) can be synthesized by a known synthesis method.
- Examples of the synthesis method include, but are not limited to, a coupling reaction between an aryl halide derivative and an arylboronic acid derivative using palladium.
- Organic EL element material refers to a material used for one of the layers that make up the organic EL element.
- Layers in which the organic EL element material represented by the general formula (1) is used include, as described later, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electrode protective film (cap layer) and so on.
- An organic EL element has an anode, a cathode, and an organic layer interposed between the anode and the cathode, and the organic layer emits light by electric energy.
- the layer structure between the anode and the cathode in such an organic EL element includes, in addition to the structure consisting only of the light-emitting layer, 1) light-emitting layer/electron transport layer, 2) hole transport layer/light-emitting layer, 3) hole transport layer/light emitting layer/electron transport layer, 4) hole injection layer/hole transport layer/light emitting layer/electron transport layer, 5) hole transport layer/light emitting layer/electron transport layer/electron injection layer, 6) positive 7) Layered structure of hole injection layer/hole transport layer/light emitting layer/electron transport layer/electron injection layer, hole injection layer/hole transport layer/light emitting layer/hole blocking layer/electron transport layer/electron injection layer is mentioned.
- the intermediate layer is also generally referred to as an intermediate electrode, intermediate conductive layer, charge generation layer, electron withdrawal layer, connection layer, and intermediate insulating layer, and known material configurations can be used.
- tandem type include, for example, 8) hole transport layer/light emitting layer/electron transport layer/charge generation layer/hole transport layer/light emitting layer/electron transport layer, 9) hole injection layer/hole transport layer/ A charge-generating layer as an intermediate layer between the anode and the cathode, such as light-emitting layer/electron-transporting layer/electron-injecting layer/charge-generating layer/hole-injecting layer/hole-transporting layer/light-emitting layer/electron-transporting layer/electron-injecting layer.
- a laminate configuration including:
- each of the above layers may be either a single layer or multiple layers, and may be doped.
- the electron injection layer and the charge generation layer are metal-doped layers, the electron transport ability and the electron injection ability to other adjacent layers can be improved, which is preferable.
- the organic EL device material represented by the general formula (1) may be used in any of the above layers in the organic EL device, but is particularly preferably used in the electron transport layer, charge generation layer or electron injection layer. .
- the structure of the organic EL device of the present invention comprises at least an electron-transporting layer and a light-emitting layer between an anode and a cathode, and the electron-transporting layer contains an organic EL device material represented by general formula (1).
- two or more layers may contain the organic EL element material represented by the general formula (1).
- the anode and the cathode have a role of supplying a sufficient current for light emission of the device, and at least one of them is transparent or translucent to extract light. is desirable.
- the anode formed on the substrate is used as a transparent electrode.
- the organic EL element In order to maintain the mechanical strength of the organic EL element, it is preferable to form the organic EL element on a substrate.
- the substrate include glass substrates such as soda glass and alkali-free glass, and plastic substrates.
- the thickness should be sufficient to maintain mechanical strength, and a thickness of 0.5 mm or more is sufficient.
- the material of the glass it is preferable that the amount of eluted ions from the glass is small, and alkali-free glass is preferable.
- soda-lime glass with a barrier coating such as SiO 2 is commercially available, and this can also be used.
- anode An anode is formed on the substrate.
- the material used for the anode is preferably a material that can efficiently inject holes into the organic layer. Moreover, it is preferably transparent or translucent in order to take out light.
- materials used for the anode include conductive metal oxides such as zinc oxide, tin oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); metals such as gold, silver, and chromium; Inorganic conductive substances such as copper and copper sulfide, and conductive polymers such as polythiophene, polypyrrole and polyaniline, and the like. Among these, ITO glass and Nesa glass are preferable.
- the electrical resistance of the substrate on which the anode is formed may be within a range in which a current sufficient for light emission of the device can be supplied, but a low resistance is preferable from the viewpoint of power consumption of the device.
- an ITO substrate with an electrical resistance of 300 ⁇ / ⁇ or less functions as an element electrode, but it is now possible to supply a substrate with an electrical resistance of about 10 ⁇ / ⁇ . is preferably used.
- the thickness of the anode can be arbitrarily selected according to the resistance value, and is usually used in the range of 45 to 300 nm.
- a hole-injecting layer is a layer interposed between the anode and the hole-transporting layer.
- the hole injection layer may be a single layer or a laminate of a plurality of layers.
- the presence of a hole injection layer between the hole transport layer and the anode is preferable because it not only enables the device to be driven at a lower voltage and extends the durability life, but also improves the carrier balance of the device and the luminous efficiency.
- the material used for the hole injection layer is not particularly limited, but examples include 4,4'-bis(N-(3-methylphenyl)-N-phenylamino)biphenyl (TPD), 4,4'-bis (N-(1-naphthyl)-N-phenylamino)biphenyl (NPD), 4,4'-bis(N,N-bis(4-biphenylyl)amino)biphenyl (TBDB), bis(N,N'- benzidine derivatives such as diphenyl-4-aminophenyl)-N,N-diphenyl-4,4′-diamino-1,1′-biphenyl (TPD232); 4,4′,4′′-tris(3-methylphenyl ( A group of materials called starburst arylamines such as phenyl)amino)triphenylamine (m-MTDATA), 4,4′,4′′-tris(1-naphthyl
- a hole injection layer may be formed by laminating a plurality of materials. Furthermore, it is more preferable that the hole injection layer is composed of an acceptor compound alone, or that the hole injection material as described above is doped with an acceptor compound, since the above effects can be obtained more remarkably.
- the acceptor compound is a material that forms a charge-transfer complex with a material that forms a hole-transport layer in contact with it when used as a single-layer film, and a material that forms a hole-injection layer when it is doped and used. The use of such a material improves the conductivity of the hole injection layer, contributes to lowering the drive voltage of the device, and can further improve the luminous efficiency and durable life.
- acceptor compounds include metal chlorides such as iron (III) chloride, aluminum chloride, gallium chloride, indium chloride, and antimony chloride; metal oxides such as molybdenum oxide, vanadium oxide, tungsten oxide, and ruthenium oxide; Charge transfer complexes such as 4-bromophenyl) aminium hexachloroantimonate (TBPAH); organic compounds having a nitro group, cyano group, halogen or trifluoromethyl group in the molecule; quinone compounds; acid anhydride compounds; fullerenes etc.
- metal oxides and cyano group-containing compounds are preferable because they are easy to handle and easy to vapor-deposit, so that the above effects can be easily obtained.
- the hole injection layer may be a single layer, A plurality of layers may be laminated and configured.
- the hole-transporting layer is a layer that transports holes injected from the anode to the light-emitting layer.
- the hole transport layer may be a single layer or may be composed of a plurality of laminated layers.
- Materials used for the hole transport layer include those exemplified as materials used for the hole injection layer.
- a triarylamine derivative or a benzidine derivative is more preferable from the viewpoint of smoothly injecting and transporting holes into the light-emitting layer.
- the light-emitting layer may be either a single layer or multiple layers.
- the light-emitting layer is formed of a light-emitting material, which may be a mixture of a host material and a dopant material, a host material alone, or a mixture of two host materials and one dopant material. or either. That is, in the organic EL element according to the embodiment of the present invention, only the host material or the dopant material may emit light, or both the host material and the dopant material may emit light in each light emitting layer. From the viewpoint of efficient use of electrical energy and obtaining light emission with high color purity, the light-emitting layer is preferably made of a mixture of a host material and a dopant material.
- the host material and the dopant material may be of one kind or a combination of a plurality of them.
- the dopant material may be contained entirely or partially in the host material.
- the dopant material can be either layered or dispersed. Dopant materials can control the emission color. From the viewpoint of suppressing the concentration quenching phenomenon, the amount of the dopant material is preferably 30% by weight or less, more preferably 20% by weight or less, based on 100% by weight of the total of the host material and the dopant material.
- the doping method can be formed by a co-evaporation method with a host material, but it may be pre-mixed with the host material and then vapor-deposited at the same time.
- Examples of light-emitting materials include condensed ring derivatives such as anthracene and pyrene, which are known as light emitters, metal chelated oxinoid compounds such as tris(8-quinolinolato)aluminum, bisstyryl derivatives such as bisstyryl anthracene derivatives and distyrylbenzene derivatives, Tetraphenylbutadiene derivatives, indene derivatives, coumarin derivatives, oxadiazole derivatives, pyrrolopyridine derivatives, perinone derivatives, cyclopentadiene derivatives, oxadiazole derivatives, thiadiazolopyridine derivatives, dibenzofuran derivatives, carbazole derivatives, indolocarbazole derivatives, Examples include polymers such as polyphenylene vinylene derivatives, polyparaphenylene derivatives, polythiophene derivatives, and the like.
- the host material contained in the light-emitting material need not be limited to one type of compound, and multiple compounds may be mixed or laminated.
- Host materials include, but are not limited to, naphthalene, anthracene, phenanthrene, pyrene, chrysene, naphthacene, triphenylene, perylene, fluoranthene, fluorene, compounds having condensed aryl rings such as indene, derivatives thereof, N,N'-dinaphthyl- aromatic amine derivatives such as N,N'-diphenyl-4,4'-diphenyl-1,1'-diamine, metal chelated oxinoid compounds such as tris(8-quinolinato)aluminum (III), distyrylbenzene derivatives, etc.
- bisstyryl derivatives tetraphenylbutadiene derivatives, indene derivatives, coumarin derivatives, oxadiazole derivatives, pyrrolopyridine derivatives, perinone derivatives, cyclopentadiene derivatives, pyrrolopyrrole derivatives, thiadiazolopyridine derivatives, dibenzofuran derivatives, carbazole derivatives, indolocarbazole derivatives, triazine derivatives; polymers such as polyphenylenevinylene derivatives, polyparaphenylene derivatives, polyfluorene derivatives, polyvinylcarbazole derivatives, and polythiophene derivatives.
- the host used when the emitting layer performs triplet emission includes metal chelated oxinoid compounds, dibenzofuran derivatives, dibenzothiophene derivatives, carbazole derivatives, indolocarbazole derivatives, triazine derivatives, triphenylene derivatives, and the like. is preferably used.
- Dopant materials contained in the light-emitting material include, for example, compounds having an aryl ring such as naphthalene, anthracene, phenanthrene, pyrene, fluoranthene, triphenylene, perylene, fluorene, and indene, and derivatives thereof (eg, 2-(benzothiazole-2- yl)-9,10-diphenylanthracene and 5,6,11,12-tetraphenylnaphthacene); furan, pyrrole, thiophene, silole, 9-silafluorene, 9,9'-spirobisilafluorene, benzothiophene , benzofuran, indole, dibenzothiophene, dibenzofuran, imidazopyridine, phenanthroline, pyrazine, naphthyridine, quinoxaline, pyrrolopyridine, compounds having a heteroaryl ring
- a dopant containing a diamine skeleton and a dopant containing a fluoranthene skeleton can further improve luminous efficiency, and the compound represented by the following general formula (2) further improves luminous efficiency and durability. be able to.
- Za ring, Zb ring and Zc ring are each independently a substituted or unsubstituted aryl ring having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted ring having 5 to 30 ring-forming atoms. It is a heteroaryl ring. Za ring, Zb ring and Zc ring are each independently preferably a substituted or unsubstituted aryl ring having 6 to 30 ring-forming carbon atoms.
- Z 1 and Z 2 are each independently an oxygen atom, NRa (a nitrogen atom having a substituent Ra) or a sulfur atom, and when Z 1 is NRa, Ra is bonded to the Za ring or Zb ring to form a ring may or may not form, and when Z2 is NRa , Ra may or may not form a ring with the Zb ring or Zc ring.
- Ra is each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring-forming atoms, or a substituted or unsubstituted 1 to 30 carbon atoms is an alkyl group of Both Z 1 and Z 2 are NRa, and Ra is preferably a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms.
- Rb is each independently a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms or a substituted or unsubstituted 1 to 30 carbon atoms is an alkyl group of Y is preferably a boron atom.
- substituents when substituted include alkyl groups, cycloalkyl groups, heterocyclic groups, alkenyl groups, cycloalkenyl groups, alkynyl groups, aryl groups, heteroaryl groups, hydroxyl groups, thiol groups, Alkoxy group, alkylthio group, arylether group, arylthioether group, halogen, cyano group, aldehyde group, acyl group, carboxyl group, ester group, amide group, acyl group, sulfonyl group, sulfonate ester group, sulfonamide group, amino group, nitro group, silyl group, siloxanyl group, boryl group and oxo group are preferred. In addition, these substituents may be further substituted with the above substituents.
- alkyl group and alkoxy group examples include those exemplified as the substituent in general formula (1).
- a cycloalkyl group is, for example, a saturated alicyclic hydrocarbon group such as a cyclopropyl group, a cyclohexyl group, a norbornyl group, and an adamantyl group, which may or may not have a substituent.
- the number of ring-forming carbon atoms is not particularly limited, but is preferably in the range of 3 or more and 20 or less.
- a heterocyclic group is, for example, a pyran ring, a piperidine ring, an aliphatic ring having a non-carbon atom in the ring such as a cyclic amide, which may or may not have a substituent.
- the number of ring-forming atoms is not particularly limited, it is preferably in the range of 3 or more and 20 or less.
- alkenyl group is, for example, an unsaturated aliphatic hydrocarbon group containing a double bond such as a vinyl group, an allyl group, or a butadienyl group, which may or may not have a substituent.
- the number of carbon atoms in the alkenyl group is not particularly limited, it is preferably in the range of 2 or more and 20 or less.
- a cycloalkenyl group is an unsaturated alicyclic hydrocarbon group containing a double bond such as, for example, a cyclopentenyl group, a cyclopentadienyl group, a cyclohexenyl group, which may or may not have a substituent. You don't have to.
- An alkynyl group is, for example, an unsaturated aliphatic hydrocarbon group containing a triple bond such as an ethynyl group, which may or may not have a substituent.
- the number of carbon atoms in the alkynyl group is not particularly limited, it is preferably in the range of 2 or more and 20 or less.
- An aryl group includes, for example, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthryl group, anthracenyl group, a benzophenanthryl group, and a benzoanthracene.
- phenyl group, biphenyl group, terphenyl group, naphthyl group, fluorenyl group, phenanthryl group, anthracenyl group, pyrenyl group, fluoranthenyl group and triphenylenyl group are preferable.
- the aryl group may or may not have a substituent.
- the number of carbon atoms in the aryl group is not particularly limited, but is preferably 6 or more and 40 or less, more preferably 6 or more and 30 or less.
- the substituents when there are substituents on two adjacent carbon atoms in the phenyl group, the substituents may form a ring structure.
- the resulting group is, depending on its structure, a "substituted phenyl group", an "aryl group having a structure in which two or more rings are condensed", or a "hetero group having a structure in which two or more rings are condensed.” aryl group”.
- the heteroaryl group includes, for example, pyridyl group, furanyl group, thiophenyl group, quinolinyl group, isoquinolinyl group, pyrazinyl group, pyrimidyl group, pyridazinyl group, triazinyl group, napthyridinyl group, cinnolinyl group, phthalazinyl group, quinoxalinyl group, quinazolinyl group, benzofuranyl group, benzothiophenyl group, indolyl group, dibenzofuranyl group, dibenzothiophenyl group, carbazolyl group, benzocarbazolyl group, carbolinyl group, indolocarbazolyl group, benzoflocarbazolyl group, benzothienocarba non-carbon groups such as zolyl, dihydroindenocarbazolyl, benzoquinolinyl, acridinyl, dibenzoacridin
- the naphthyridinyl group is any of a 1,5-naphthyridinyl group, a 1,6-naphthyridinyl group, a 1,7-naphthyridinyl group, a 1,8-naphthyridinyl group, a 2,6-naphthyridinyl group and a 2,7-naphthyridinyl group.
- a heteroaryl group may or may not have a substituent.
- the number of ring-forming atoms of the heteroaryl group is not particularly limited, it is preferably in the range of 3 to 40, more preferably in the range of 3 to 30.
- An alkylthio group is an alkoxy group in which the oxygen atom of the ether bond is substituted with a sulfur atom.
- the alkylthio group may or may not have a substituent.
- the number of carbon atoms in the alkylthio group is not particularly limited, it is preferably in the range of 1 or more and 20 or less.
- An aryl ether group is, for example, a functional group to which an aromatic hydrocarbon group is bonded via an ether bond, such as a phenoxy group, and may or may not have a substituent.
- the number of carbon atoms in the aryl ether group is not particularly limited, it is preferably in the range of 6 or more and 40 or less.
- An arylthioether group refers to a functional group in which an oxygen atom of an ether bond of an arylether group is substituted with a sulfur atom, and may or may not have a substituent.
- the number of carbon atoms in the arylthioether group is not particularly limited, it is preferably in the range of 6 or more and 40 or less.
- Halogen means fluorine, chlorine, bromine or iodine.
- An acyl group is a functional group in which an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heteroaryl group is bonded via a carbonyl group, such as an acetyl group, a propionyl group, a benzoyl group, an acrylyl group, or the like. , may or may not have a substituent.
- the number of carbon atoms in the acyl group is not particularly limited, it is preferably 2 or more and 40 or less, more preferably 2 or more and 30 or less.
- An ester group refers to a functional group in which, for example, an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, etc. are bonded via an ester bond, and may or may not have a substituent.
- the number of carbon atoms in the ester group is not particularly limited, but is preferably in the range of 1 to 20.
- a methyl ester group such as a methoxycarbonyl group, an ethyl ester group such as an ethoxycarbonyl group, a propyl ester group such as a propoxycarbonyl group, a butyl ester group such as a butoxycarbonyl group, and an isopropyl group such as an isopropoxymethoxycarbonyl group.
- Examples include an ester group, a hexyl ester group such as a hexyloxycarbonyl group, and a phenyl ester group such as a phenoxycarbonyl group.
- An amide group is, for example, a functional group in which an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, or the like is bonded via an amide bond, and may or may not have a substituent.
- the number of carbon atoms in the amide group is not particularly limited, it is preferably in the range of 1 or more and 20 or less. More specific examples include a methylamido group, an ethylamido group, a propylamido group, a butylamido group, an isopropylamido group, a hexylamido group, a phenylamido group and the like.
- the number of carbon atoms in the sulfonyl group is not particularly limited, but is preferably in the range of 1 to 20.
- a sulfonate ester group is, for example, a functional group in which an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, or the like is bonded via a sulfonate ester bond, and may or may not have a substituent.
- the number of carbon atoms in the sulfonate group is not particularly limited, but is preferably in the range of 1 or more and 20 or less.
- a sulfonamide group is, for example, a functional group in which an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, or the like is bonded via a sulfonamide bond, and may or may not have a substituent. good.
- the number of carbon atoms in the sulfonamide group is not particularly limited, it is preferably in the range of 1 or more and 20 or less.
- the amino group may or may not have a substituent.
- the number of carbon atoms in the amino group is not particularly limited, but is preferably 2 or more and 50 or less, more preferably 6 or more and 40 or less, and particularly preferably 6 or more and 30 or less.
- a silyl group is a functional group to which a substituted or unsubstituted silicon atom is bonded, and examples thereof include alkylsilyl groups such as trimethylsilyl group, triethylsilyl group, tert-butyldimethylsilyl group, propyldimethylsilyl group and vinyldimethylsilyl group. and arylsilyl groups such as a phenyldimethylsilyl group, a tert-butyldiphenylsilyl group, a triphenylsilyl group and a trinaphthylsilyl group.
- a silyl group may or may not have a substituent. Although the number of carbon atoms in the silyl group is not particularly limited, it is preferably in the range of 1 or more and 30 or less.
- a siloxanyl group indicates a silicon compound group via an ether bond such as a trimethylsiloxanyl group.
- a siloxanyl group may or may not have a substituent.
- the boryl group may or may not have a substituent.
- Examples of compounds represented by general formula (2) include the following.
- the light-emitting layer preferably contains a triplet light-emitting material.
- a metal complex compound containing at least one metal selected from the group consisting of ) is preferred.
- a ligand that constitutes the metal complex compound preferably has a nitrogen-containing aromatic heterocyclic ring such as a phenylpyridine skeleton, a phenylquinoline skeleton, or a carbene skeleton.
- a nitrogen-containing aromatic heterocyclic ring such as a phenylpyridine skeleton, a phenylquinoline skeleton, or a carbene skeleton.
- an appropriate complex is selected from the required emission color, device performance, and relationship with the host compound.
- tris(2-phenylpyridyl)iridium complex tris ⁇ 2-(2-thiophenyl)pyridyl ⁇ iridium complex, tris ⁇ 2-(2-benzothiophenyl)pyridyl ⁇ iridium complex, tris(2-phenyl benzothiazole)iridium complex, tris(2-phenylbenzoxazole)iridium complex, trisbenzoquinolineiridium complex, bis(2-phenylpyridyl)(acetylacetonate)iridium complex, bis ⁇ 2-(2-thiophenyl)pyridyl ⁇ iridium complex, bis ⁇ 2-(2-benzothiophenyl)pyridyl ⁇ (acetylacetonato)iridium complex, bis(2-phenylbenzothiazole)(acetylacetonato)iridium complex, bis(2-phenylbenzoxazole)(acetylacetonato) nate) iridium
- the above triplet light-emitting materials used as dopant materials may be contained in the light-emitting layer alone, or may be used in combination of two or more.
- the total weight of the dopant materials is preferably 30% by weight or less, more preferably 20% by weight or less, when the total weight of the host material and the dopant materials is 100% by weight. .
- Preferable host materials and dopant materials in the triplet emission system are not particularly limited, but specific examples include the following.
- the light emitting layer contains a thermally activated delayed fluorescence material.
- the heat-activated delayed fluorescence is explained on pages 87 to 103 of "State-of-the-Art Organic EL" (edited by Chihaya Adachi and Hiroshi Fujimoto, published by CMC Publishing). In that literature, by bringing the energy levels of the excited singlet state and the excited triplet state close to each other, the reverse energy transfer from the excited triplet state, which normally has a low transition probability, to the excited singlet state is high. It is explained that it occurs efficiently and thermally activated delayed fluorescence (TADF) is expressed. Furthermore, FIG. 5 in the document explains the generation mechanism of delayed fluorescence. Emission of delayed fluorescence can be confirmed by transient PL (Photo Luminescence) measurement.
- Thermally activated delayed fluorescence materials are also generally called TADF materials.
- the thermally activated delayed fluorescence material may be a single material that exhibits thermally activated delayed fluorescence, or a plurality of materials that exhibit thermally activated delayed fluorescence. When a plurality of materials are used, they may be used as a mixture, or may be used by stacking layers of each material.
- a known material can be used as the thermally activated delayed fluorescence material. Examples include, but are not limited to, benzonitrile derivatives, triazine derivatives, disulfoxide derivatives, carbazole derivatives, indolocarbazole derivatives, dihydrophenazine derivatives, thiazole derivatives, oxadiazole derivatives and the like.
- the light-emitting layer further contains a fluorescent dopant. This is because triplet excitons are converted into singlet excitons by the TADF material, and the singlet excitons are received by the fluorescent dopant, thereby achieving higher luminous efficiency and longer durability.
- the electron transport layer is a layer into which electrons are injected from the cathode and which transports the electrons.
- the electron transport layer is desired to have high electron injection efficiency and efficiently transport the injected electrons. Therefore, the material constituting the electron transport layer is preferably a substance that has high electron affinity, high electron mobility, excellent stability, and does not easily generate trapping impurities during production and use.
- a compound having a molecular weight of 400 or more is preferable in order to maintain a stable film quality, because a low-molecular-weight compound tends to crystallize and deteriorate the film quality.
- the electron-transporting layer in the present invention also includes a hole-blocking layer capable of efficiently blocking the movement of holes.
- the hole-blocking layer and the electron-transporting layer may be composed of a single material or a laminate of multiple materials.
- electron transport materials used in the electron transport layer include condensed polycyclic aromatic derivatives such as naphthalene and anthracene; styryl aromatic ring derivatives such as 4,4′-bis(diphenylethenyl)biphenyl; anthraquinone and diphenoquinone; phosphorus oxide derivatives; quinolinol complexes such as tris(8-quinolinolato)aluminum (III), benzoquinolinol complexes, hydroxyazole complexes, azomethine complexes, tropolone metal complexes and various metal complexes such as flavonol metal complexes.
- a heteroaryl ring structure composed of an element selected from carbon, hydrogen, nitrogen, oxygen, silicon, and phosphorus and containing an electron-accepting nitrogen can be used to further reduce the driving voltage and obtain more efficient light emission. It is preferable to use a compound having
- the electron-accepting nitrogen here means a nitrogen atom that forms a multiple bond with an adjacent atom. Due to the high electronegativity of the nitrogen atom, the multiple bond has electron-accepting properties. Therefore, heteroaromatic rings containing electron-accepting nitrogen have high electron affinities.
- An electron-transporting material having electron-accepting nitrogen makes it easier to accept electrons from a cathode having a high electron affinity, and can be driven at a lower voltage. In addition, more electrons are supplied to the light-emitting layer and the probability of recombination is increased, so that the light emission efficiency is further improved.
- Heteroaryl rings containing electron-accepting nitrogen include, for example, triazine ring, pyridine ring, pyrazine ring, pyrimidine ring, quinoline ring, quinoxaline ring, quinazoline ring, naphthyridine ring, pyrimidopyrimidine ring, benzoquinoline ring, phenanthroline ring, imidazole ring, oxazole ring, oxadiazole ring, triazole ring, thiazole ring, thiadiazole ring, benzoxazole ring, benzothiazole ring, benzimidazole ring, phenanthroimidazole ring and the like.
- Examples of compounds having these heteroaryl ring structures include pyridine derivatives, triazine derivatives, quinazoline derivatives, pyrimidine derivatives, benzimidazole derivatives, benzoxazole derivatives, benzthiazole derivatives, oxadiazole derivatives, thiadiazole derivatives, triazole derivatives, pyrazine. derivatives, phenanthroline derivatives, quinoxaline derivatives, quinoline derivatives, benzoquinoline derivatives, oligopyridine derivatives such as bipyridine and terpyridine, quinoxaline derivatives and naphthyridine derivatives.
- imidazole derivatives such as tris(N-phenylbenzimidazol-2-yl)benzene, oxadiazole derivatives such as 1,3-bis[(4-tert-butylphenyl)1,3,4-oxadiazolyl]phenylene, triazole derivatives such as N-naphthyl-2,5-diphenyl-1,3,4-triazole, phenanthroline derivatives such as bathocuproine and 1,3-bis(1,10-phenanthrolin-9-yl)benzene, 2,2' - benzoquinoline derivatives such as bis(benzo[h]quinolin-2-yl)-9,9'-spirobifluorene, 2,5-bis(6'-(2',2''-bipyridyl))-1, bipyridine derivatives such as 1-dimethyl-3,4-diphenylsilole, terpyridine derivatives such as 1,3-bis(4′-
- the condensed polycyclic aromatic skeleton is preferably a fluoranthene skeleton, anthracene skeleton, a pyrene skeleton, or a phenanthroline skeleton. more preferred.
- Preferable electron-transporting materials are not particularly limited, but specific examples include the following.
- the organic EL element material represented by the general formula (1) is also preferable because it has a high electron-transporting property and exhibits excellent properties as an electron-transporting layer.
- the electron-transporting material may be used alone, or two or more of the electron-transporting materials may be mixed and used, or one or more other electron-transporting materials may be mixed with the electron-transporting material. I do not care. Moreover, you may contain a donor compound.
- the donor compound means that, when used in the electron transport layer, it facilitates electron injection from the cathode or the electron injection layer to the electron transport layer by improving the electron injection barrier, and further improves the electrical conductivity of the electron transport layer. is a compound that improves
- the donor compound include an alkali metal, an inorganic salt containing an alkali metal, a complex of an alkali metal and an organic substance, an alkaline earth metal, an inorganic salt containing an alkaline earth metal, or a mixture of an alkaline earth metal and an organic substance. complexes, rare earth metals, and the like.
- alkali metals, alkaline earth metals, and rare earth metals include alkali metals such as lithium, sodium, potassium, rubidium, and cesium, which have a low work function and are highly effective in improving electron transport ability, and magnesium, calcium, cerium, and barium. and alkaline earth metals such as samarium, europium, and ytterbium.
- Preferred examples of alkali metals or alkaline earth metals include lithium and cesium from the viewpoint that the driving voltage can be further reduced. A plurality of these metals may be used, or an alloy of these metals may be used.
- these metals are preferably in the form of an inorganic salt or a complex with an organic substance rather than a single metal, since vapor deposition in a vacuum is easy and handling is excellent. Furthermore, it is more preferable to be in the state of a complex with an organic substance in terms of facilitating handling in the atmosphere and facilitating adjustment of the addition concentration.
- inorganic salts include oxides such as LiO and Li2O; nitrides; fluorides such as LiF, NaF , KF ; Li2CO3 , Na2CO3 , K2CO3 , Rb2CO3 ; Carbonates such as Cs 2 CO 3 and the like are included.
- the organic matter in the complex with the organic matter include quinolinol, benzoquinolinol, pyridylphenol, flavonol, hydroxyimidazopyridine, hydroxybenzazole, and hydroxytriazole.
- an alkali metal complex compound which is a complex of an alkali metal and an organic substance, is preferable from the viewpoint that the driving voltage of the organic EL device can be further reduced.
- a complex of lithium and an organic substance is more preferable, and lithium quinolinol (Liq), which is available at a relatively low cost, is particularly preferable.
- the ionization potential of the electron transport layer is not particularly limited, it is preferably 5.6 eV or more and 8.0 eV or less, more preferably 5.6 eV or more and 7.0 eV or less.
- an electron injection layer may be provided between the cathode and the electron transport layer.
- An electron-injecting layer is generally inserted for the purpose of assisting the injection of electrons from the cathode into the electron-transporting layer.
- a compound having a heteroaryl ring structure containing electron-accepting nitrogen may be used, or a layer containing the above-described donor material may be used.
- inorganic materials such as insulators and semiconductors can also be used for the electron injection layer.
- the short circuit of the organic EL element can be suppressed and the electron injection properties can be improved.
- Such an insulator is preferably at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides and alkaline earth metal halides.
- preferred alkali metal chalcogenides include, for example, Li2O , Na2S and Na2Se .
- Preferred alkaline earth metal chalcogenides also include, for example, CaO, BaO, SrO, BeO, BaS and CaSe.
- Preferred alkali metal halides include, for example, LiF, NaF, KF, LiCl, KCl and NaCl.
- Preferred examples of halides of alkaline earth metals include fluorides such as CaF 2 , BaF 2 , SrF 2 , MgF 2 and BeF 2 , and halides other than fluorides.
- a complex of an organic substance and a metal is also preferably used.
- a complex of an organic substance and a metal is used for the electron injection layer, the film thickness can be easily adjusted.
- organic substances in organometallic complexes include quinolinol, benzoquinolinol, pyridylphenol, flavonol, hydroxyimidazopyridine, hydroxybenzazole, and hydroxytriazole.
- the layer containing the organic EL device material represented by the general formula (1) has a high electron injection property and exhibits excellent properties as an electron injection layer, which is preferable. Furthermore, when the organic EL element material represented by the general formula (1) is used as the electron injection layer, it is preferably doped with the alkali metal or rare earth metal, which further reduces the driving voltage and extends the durability life. can be improved.
- the material used for the cathode is not particularly limited as long as it can efficiently inject electrons into the light-emitting layer.
- materials used for the cathode include metals such as platinum, gold, silver, copper, iron, tin, aluminum, and indium, or combinations of these metals with low work function metals such as lithium, sodium, potassium, calcium, and magnesium. Examples include alloys and multilayer lamination. Among them, metals selected from aluminum, silver and magnesium are preferable as the main component in terms of electrical resistance, ease of film formation, film stability, and luminous efficiency. It is more preferable to be composed of magnesium and silver because electron injection is easy.
- the material constituting the protective layer is not particularly limited, but for example, metals such as platinum, gold, silver, copper, iron, tin, aluminum and indium; alloys using these metals; silica, titania and Inorganic substances such as silicon nitride; organic polymer compounds such as polyvinyl alcohol, polyvinyl chloride, and hydrocarbon-based polymer compounds;
- the organic EL element material represented by the general formula (1) can also be used as a capping material.
- the capping material preferably has light transmittance in the visible light region.
- the charge generation layer in the present invention generally consists of a double layer. Specifically, it is preferred to use a pn junction charge generation layer consisting of an n-type charge generation layer and a p-type charge generation layer.
- the pn junction charge generation layer generates charges or separates the charges into holes and electrons when a voltage is applied in the organic EL element, and converts these holes and electrons into holes and electrons. It is injected into the light-emitting layer via the transport layer.
- the charge-generating layer functions as an intermediate charge-generating layer between the plurality of light-emitting layers in an organic EL device in which a plurality of light-emitting layers are stacked.
- the n-type charge-generating layer supplies electrons to the first light-emitting layer on the anode side
- the p-type charge-generating layer supplies holes to the second light-emitting layer on the cathode side. Therefore, it is possible to further improve the luminous efficiency of the organic EL element in which a plurality of light-emitting layers are laminated, reduce the driving voltage, and further improve the durable life of the element.
- the n-type charge generation layer consists of an n-type dopant material and a host material, and conventional materials can be used for these.
- alkali metals, alkaline earth metals, or rare earth metals can be used as n-type dopant materials.
- Preferred n-type dopant materials are lithium or ytterbium. A plurality of these metals may be used in combination. Alloys of alkali metals, alkaline earth metals or rare earth metals with other metals may also be used.
- Metals that can be used as materials for the alloy include, but are not limited to, zinc, cadmium, and bismuth.
- the host material compounds having nitrogen-containing aromatic heterocycles such as phenanthroline derivatives and oligopyridine derivatives can be used. Compounds with phosphine oxide groups can also be used.
- the organic EL device material or the phenanthroline dimer represented by the general formula (1) is preferable because it exhibits excellent properties as a host for the n-type charge generation layer. A plurality of these may be used in combination.
- the p-type charge generation layer comprises a p-type dopant material and a host material, and conventional materials can be used for these.
- p-type dopant materials include tetrafluor-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), tetracyanoquinodimethane derivatives, radialene derivatives, iodine, FeCl 3 , FeF 3 , SbCl 5 and the like can be used.
- a preferred p-type dopant material is a radialene derivative.
- An arylamine derivative is preferred as the host material.
- each layer constituting the organic EL element is not particularly limited, and may be resistance heating vapor deposition, electron beam vapor deposition, sputtering, molecular lamination method, coating method, or the like. Resistance heating vapor deposition or electron beam vapor deposition is usually preferable from the viewpoint of device characteristics.
- the total thickness of the organic layers interposed between the anode and the cathode cannot be limited because it depends on the resistance value of the light-emitting substance, but it is preferably 1 to 1000 nm.
- the film thicknesses of the light-emitting layer, the electron-transporting layer, and the hole-transporting layer are each preferably 1 nm or more and 200 nm or less, more preferably 5 nm or more and 100 nm or less.
- the organic EL element according to the embodiment of the present invention has the function of converting electrical energy into light.
- direct current is mainly used as electric energy, but pulse current and alternating current can also be used.
- the current value and voltage value it should be selected so that the maximum luminance can be obtained with the lowest possible energy.
- the organic EL element according to the embodiment of the present invention is suitable for use as a display device such as a matrix and/or segment display.
- the organic EL element according to the embodiment of the present invention is preferably used as a backlight for various devices.
- Backlights are mainly used for the purpose of improving the visibility of display devices such as non-self-luminous displays, and are used in liquid crystal displays, clocks, audio devices, automobile panels, display boards, signs, and the like.
- the organic EL device of the present invention is preferably used for liquid crystal displays, especially for backlights for personal computers, for which thinning is being considered, and it is possible to provide thinner and lighter backlights than conventional ones.
- the organic EL element according to the embodiment of the present invention is also preferably used as various lighting devices.
- the organic EL element according to the embodiment of the present invention can achieve both high luminous efficiency and high color purity, and furthermore, can be made thinner and lighter. , it is possible to realize a lighting device with a high degree of design.
- the resulting compound 5 was purified by sublimation at about 360° C. under a pressure of 1 ⁇ 10 ⁇ 3 Pa using an oil diffusion pump.
- the HPLC purity (area % at a measurement wavelength of 254 nm) of compound 5 before and after sublimation purification was both 99.9%.
- the resulting compound 10 was purified by sublimation at about 360° C. under a pressure of 1 ⁇ 10 ⁇ 3 Pa using an oil diffusion pump.
- the HPLC purity (area % at a measurement wavelength of 254 nm) of Compound 1 before and after sublimation purification was both 99.9%.
- the devices obtained in Examples 1 to 12 and Comparative Examples 1 to 14 were each DC-driven at 10 mA/cm 2 and the initial driving voltage was measured. Further, the voltage was measured when DC driving was performed for 100 hours at a current density of 10 mA/cm 2 in an environment of temperature 70° C., and the amount of voltage increase from the initial driving voltage was calculated.
- the organic EL devices obtained in Examples 13 to 24 and Comparative Examples 15 to 28 were lit at a luminance of 1000 cd/m 2 and the initial drive voltage was measured. Also, the voltage was measured when the device was driven at a constant current of 10 mA/cm 2 at room temperature for 100 hours. The amount of voltage increase was calculated after 100 hours from when the measurement was started.
- Luminance The organic EL devices obtained in Examples 25 to 63 and Comparative Examples 29 to 70 were lit at 10 mA/cm 2 , luminance was measured, and luminous efficiency was evaluated. It can be evaluated that the higher the luminance, the better the luminous efficiency.
- Example 1 A glass substrate (manufactured by Geomatec, 11 ⁇ / ⁇ , sputter product) on which an ITO transparent conductive film of 125 nm was deposited as an anode was cut into 38 mm ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned for 15 minutes using "Semico Clean” (registered trademark) 56 (trade name, manufactured by Furuuchi Chemical Co., Ltd.) and then cleaned with ultrapure water. This substrate was treated with UV-ozone for 1 hour immediately before manufacturing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus reached 5 ⁇ 10 ⁇ 4 Pa or less.
- aluminum was vapor-deposited to a thickness of 60 nm to form a cathode, and a device of 5 mm ⁇ 5 mm square was produced.
- the film thickness referred to here is a crystal oscillation type film thickness monitor display value, and is common to other examples and comparative examples.
- the initial drive voltage was 0.029 V
- the voltage increase amount after driving at 70° C. for 100 hours was 0.001 V.
- Examples 2-12, Comparative Examples 1-14 A device was fabricated in the same manner as in Example 1, except that the compound used and the vapor deposition rate ratio of the compound and the metal element were changed as shown in Table 1.
- Table 1 shows the results of each example and comparative example.
- Compounds 2 to 26 are compounds shown below.
- Example 13 A glass substrate (manufactured by Geomatec, 11 ⁇ / ⁇ , sputtered product) on which an ITO transparent conductive film of 165 nm was deposited as an anode was cut into 38 mm ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned for 15 minutes using "Semico Clean" 56 (trade name, manufactured by Furuuchi Chemical Co., Ltd.) and then cleaned with ultrapure water. This substrate was treated with UV-ozone for 1 hour immediately before manufacturing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus reached 5 ⁇ 10 ⁇ 4 Pa or less.
- "Semico Clean" 56 trade name, manufactured by Furuuchi Chemical Co., Ltd.
- HAT-CN 6 was vapor-deposited to a thickness of 5 nm as a hole injection layer, and then HT-1 was vapor-deposited to a thickness of 50 nm as a hole transport layer by resistance heating.
- a mixed layer of host material H-1 and dopant material D-1 was deposited to a thickness of 20 nm with a doping concentration of 5% by weight.
- aluminum was vapor-deposited to a thickness of 60 nm to form a cathode, and an organic EL element of 5 mm ⁇ 5 mm square was produced.
- Examples 14-24, Comparative Examples 15-28 An organic EL device was produced in the same manner as in Example 13, except that the compound used and the vapor deposition rate ratio of the compound and the metal element were changed as shown in Table 2. Table 2 shows the results of each example and comparative example.
- Example 25 A glass substrate (manufactured by Geomatec, 11 ⁇ / ⁇ , sputtered product) on which an ITO transparent conductive film of 165 nm was deposited as an anode was cut into 38 mm ⁇ 46 mm and etched. The obtained substrate was ultrasonically cleaned for 15 minutes using "Semico Clean" 56 (trade name, manufactured by Furuuchi Chemical Co., Ltd.) and then cleaned with ultrapure water. This substrate was treated with UV-ozone for 1 hour immediately before manufacturing the device, placed in a vacuum deposition apparatus, and evacuated until the degree of vacuum in the apparatus reached 5 ⁇ 10 ⁇ 4 Pa or less. First, HAT-CN 6 was vapor-deposited to 5 nm as a hole injection layer by a resistance heating method. Next, a light-emitting unit (first light-emitting unit) was formed on the hole-injection layer, comprising a hole-transporting layer, a light-emitting layer, and an electron-transporting layer.
- first light-emitting unit
- HT-1 was vapor-deposited to a thickness of 50 nm as a hole transport layer, and then a mixed layer of host material H-1 and dopant material D-1 was formed as a light-emitting layer with a doping concentration of 5% by weight. Then, as an electron transport layer, ET-1 and 2E-1 were deposited to a thickness of 35 nm so that the deposition rate ratio of ET-1 and 2E-1 was 1:1. vapor-deposited on.
- 10 nm of HAT-CN 6 was vapor-deposited as a p-type charge generation layer.
- a second light-emitting unit was formed in the same manner as the first light-emitting unit.
- a 5 mm square organic EL device was produced.
- the initial drive voltage was 8.21 V
- the luminance was 1760 cd/m 2
- the endurance life was 2620 hours.
- Example 26-38 Comparative Examples 29-42 An organic EL device was produced in the same manner as in Example 25, except that the compound used and the vapor deposition rate ratio of the compound and the metal element were changed as shown in Table 3.
- a mixed layer of host material H-1 and dopant material D-2 was vapor-deposited to a thickness of 20 nm as a light-emitting layer so that the doping concentration was 5% by weight.
- Table 3 shows the results of each example and comparative example. D-2 and ET-2 are compounds shown below.
- Example 39 Example 25 except that Compound 1 was used instead of ET-1 in forming the electron transport layer, and ET-2 was used instead of Compound 1 in forming the n-type charge generation layer. An organic EL device was produced in the same manner.
- the initial drive voltage was 8.20 V
- the luminance was 1790 cd/m 2
- the endurance life was 2600 hours.
- Examples 40-50, Comparative Examples 43-56 An organic EL device was produced in the same manner as in Example 39, except that the compound used and the vapor deposition rate ratio of the compound and the metal element were changed as shown in Table 4. Table 4 shows the results of each example and comparative example.
- Examples 51-63, Comparative Examples 57-70 An organic EL device was produced in the same manner as in Example 25, except that the compounds used, the types of metal elements, and the vapor deposition rate ratio were changed as shown in Table 5.
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Abstract
Description
本発明の一つの実施形態である一般式(1)で表される有機EL素子用材料は、以下に示されるフェナントロリン誘導体からなり、有機EL素子を構成する層のうち、いずれかの層に使用される材料を表す。つまり、有機EL素子用材料とは、下記一般式(1)で表されるフェナントロリン誘導体の用途を意味する。
次に、有機EL素子の実施の形態について詳細に説明する。有機EL素子は、陽極と陰極、およびそれら陽極と陰極との間に介在する有機層を有し、該有機層が電気エネルギーにより発光する。
有機EL素子の機械的強度を保つために、有機EL素子を基板上に形成することが好ましい。基板としては、ソーダガラスや無アルカリガラスなどのガラス基板や、プラスチック基板などが挙げられる。ガラス基板を用いる場合、厚みは、機械的強度を保つために十分な厚みがあればよく、0.5mm以上あれば十分である。ガラスの材質については、ガラスからの溶出イオンが少ないことが好ましく、無アルカリガラスが好ましい。また、SiO2などのバリアコートを施したソーダライムガラスも市販されており、これを使用することもできる。
基板上に陽極が形成される。陽極に用いる材料は、正孔を有機層に効率よく注入できる材料が好ましい。また、光を取り出すために、透明または半透明であることが好ましい。陽極に用いる材料としては、例えば、酸化亜鉛、酸化錫、酸化インジウム、酸化錫インジウム(ITO)、酸化亜鉛インジウム(IZO)などの導電性金属酸化物;金、銀、クロムなどの金属;ヨウ化銅、硫化銅などの無機導電性物質、ポリチオフェン、ポリピロール、ポリアニリンなどの導電性ポリマーなどが挙げられる。これらの中でも、ITOガラスやネサガラスが好ましい。これらの電極材料は、単独で用いてもよいし、複数の材料を積層または混合して用いてもよい。陽極を形成した基板の電気抵抗は、素子の発光に十分な電流が供給できる範囲であればよいが、素子の消費電力の観点からは、低抵抗であることが好ましい。例えば、電気抵抗が300Ω/□以下のITO基板であれば素子電極として機能するが、現在では10Ω/□程度の基板の供給も可能になっていることから、20Ω/□以下の低抵抗の基板を使用することが好ましい。陽極の厚みは抵抗値に合わせて任意に選ぶことができ、通常45~300nmの間で用いられることが多い。
正孔注入層は、陽極と正孔輸送層の間に挿入される層である。正孔注入層は1層であっても複数の層が積層されていてもよい。正孔輸送層と陽極の間に正孔注入層が存在すると、より低電圧駆動し、耐久寿命も向上するだけでなく、さらに素子のキャリアバランスが向上して発光効率も向上するため好ましい。
正孔輸送層は、陽極から注入された正孔を発光層まで輸送する層である。正孔輸送層は単層であっても複数の層が積層されて構成されていてもよい。
発光層は、単一層および複数層のいずれでもよい。発光層は、発光材料により形成され、これはホスト材料とドーパント材料との混合物であっても、ホスト材料単独であっても、2種類のホスト材料と1種類のドーパント材料との混合物であっても、いずれでもよい。すなわち、本発明の実施の形態における有機EL素子は、各発光層において、ホスト材料もしくはドーパント材料のみが発光してもよいし、ホスト材料とドーパント材料がともに発光してもよい。電気エネルギーを効率よく利用し、高色純度の発光を得るという観点からは、発光層はホスト材料とドーパント材料の混合物からなることが好ましい。また、ホスト材料とドーパント材料は、それぞれ一種類であっても、複数の組み合わせであっても、いずれでもよい。発光層がホスト材料とドーパント材料の混合物からなる場合、ドーパント材料はホスト材料の全体に含まれていても、部分的に含まれていても、いずれでもよい。ドーパント材料は積層されていても、分散されていても、いずれでもよい。ドーパント材料は発光色の制御ができる。ドーパント材料の量は、濃度消光現象を抑制する観点から、ホスト材料とドーパント材料の合計を100重量%として30重量%以下が好ましく、さらに好ましくは20重量%以下である。ドーピング方法は、ホスト材料との共蒸着法によって形成することができるが、ホスト材料と予め混合してから同時に蒸着してもよい。
本発明において、電子輸送層とは、陰極から電子が注入され、さらに電子を輸送する層である。電子輸送層には、電子注入効率が高く、注入された電子を効率良く輸送することが望まれる。そのため、電子輸送層を構成する材料は、電子親和力が大きく、電子移動度が大きく、安定性に優れ、製造時および使用時に、トラップとなる不純物が発生しにくい物質であることが好ましい。特に膜厚を厚く積層する場合には、低分子量の化合物は結晶化するなどして膜質が劣化しやすいため、安定な膜質を保つため、分子量400以上の化合物が好ましい。しかしながら、正孔と電子の輸送バランスを考えた場合に、電子輸送層が陽極からの正孔が再結合せずに陰極側へ流れることを効率よく阻止できる役割を主に果たすならば、電子輸送能力がそれ程高くない材料で構成されていても、発光効率を向上させる効果は電子輸送能力が高い材料で構成されている場合と同等となる。したがって、本発明における電子輸送層には、正孔の移動を効率よく阻止できる正孔阻止層も同義のものとして含まれる。正孔阻止層および電子輸送層は単独でも複数の材料が積層されて構成されていてもよい。
本発明において、陰極と電子輸送層の間に電子注入層を設けてもよい。一般的に電子注入層は陰極から電子輸送層への電子の注入を助ける目的で挿入される。挿入する場合は、電子受容性窒素を含むヘテロアリール環構造を有する化合物を用いてもよいし、上記のドナー性材料を含有する層を用いてもよい。
陰極に用いる材料は、電子を効率よく発光層に注入できる物質であれば特に限定されない。陰極に用いる材料としては、例えば、白金、金、銀、銅、鉄、錫、アルミニウム、インジウムなどの金属、またはこれらの金属とリチウム、ナトリウム、カリウム、カルシウム、マグネシウムなどの低仕事関数金属との合金や多層積層などが挙げられる。中でも、電気抵抗値や製膜しやすさ、膜の安定性、発光効率などの面から、主成分としてはアルミニウム、銀およびマグネシウムから選ばれた金属が好ましく、電子輸送層および電子注入層への電子注入が容易であることから、マグネシウムと銀で構成されることがより好ましい。
陰極保護のために、陰極上に保護層(キャップ層)を積層することが好ましい。保護層を構成する材料(キャッピング材料)としては、特に限定されないが、例えば、白金、金、銀、銅、鉄、錫、アルミニウムおよびインジウムなどの金属;これら金属を用いた合金;シリカ、チタニアおよび窒化ケイ素などの無機物;ポリビニルアルコール、ポリ塩化ビニル、炭化水素系高分子化合物などの有機高分子化合物などが挙げられる。また、一般式(1)で表される有機EL素子用材料も、キャッピング材料として利用できる。ただし、有機EL素子が、陰極側から光を取り出す素子構造(トップエミッション構造)である場合は、キャッピング材料は、可視光領域において光透過性を有することが好ましい。
本発明における電荷発生層は、一般に二重層からなり、具体的には、n型電荷発生層およびp型電荷発生層からなるpn接合電荷発生層を用いることが好ましい。上記pn接合型電荷発生層は、有機EL素子中で電圧が印加されることにより、電荷を発生、または電荷を正孔および電子に分離し、これらの正孔および電子を正孔輸送層および電子輸送層を経由して発光層に注入する。電荷発生層は、具体的には、複数の発光層が積層された有機EL素子において、該複数の発光層の中間の電荷発生層として機能する。n型電荷発生層は陽極側に存在する第一発光層に電子を供給し、p型電荷発生層は陰極側に存在する第二発光層に正孔を供給する。そのため、複数の発光層を積層した有機EL素子における発光効率をより向上させ、駆動電圧を下げることができ、素子の耐久寿命もより向上させることができる。
MS(m/z):640[M+H]+
1H-NMR(400MHz、CDCl3)δ:8.94(s、1H)、8.81-8.87(m、2H)、8.65-8.74(m、4H)、8.40-8.52(m、3H)、8.23-8.40(m、4H)、7.78-7.99(m、6H)、7.64-7.78(m、2H)、7.31-7.50(m、4H)。
MS(m/z):614[M+H]+
1H-NMR(400MHz、CDCl3)δ:9.23(s、1H)、8.84-8.88(m、2H)、8.65-8.79(m、3H)、8.34-8.43(m、1H)、8.24-8.34(m、1H)、7.82-8.20(m、9H)、7.58-7.74(m、4H)、7.42-7.52(m、2H)、7.31-7.42(m、2H)。
実施例1~12および比較例1~14において得られた素子を、それぞれ10mA/cm2で直流駆動し、初期駆動電圧を測定した。さらに、温度70℃の環境下、電流密度10mA/cm2で100時間直流駆動したときの電圧を測定し、初期駆動電圧からの電圧上昇量を算出した。
実施例13~24および比較例15~28において得られた有機EL素子を、それぞれ電流密度10mA/cm2で点灯させ、外部量子効率を測定し、発光効率を評価した。外部量子効率が高いほど、発光効率に優れると評価できる。
実施例25~63および比較例29~70において得られた有機EL素子を、10mA/cm2で点灯させ、輝度を測定し、発光効率を評価した。輝度が高いほど、発光効率に優れると評価できる。
実施例13~63および比較例15~70において得られた有機EL素子を、10mA/cm2の定電流で継続駆動させた。測定を始めた時点の輝度から輝度が20%低下する時間を測定し、耐久寿命とした。
陽極としてITO透明導電膜を125nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を38mm×46mmに切断し、エッチングを行った。得られた基板を、“セミコクリーン”(登録商標)56(商品名、フルウチ化学(株)製)を用いて15分間超音波洗浄してから、超純水で洗浄した。この基板を、素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、前記化合物1と、ドーパントである金属元素Liとを、蒸着速度比が化合物1:Li=99:1となるように100nm蒸着し、重量比が99:1の層を形成した。その後、アルミニウムを60nm蒸着して陰極とし、5mm×5mm角の素子を作製した。ここで言う膜厚は、水晶発振式膜厚モニター表示値であり、他の実施例および比較例においても共通する。
用いる化合物および化合物と金属元素の蒸着速度比を表1に記載の通りに変更したこと以外は実施例1と同様にして素子を作製した。各実施例および比較例の結果を表1に示す。なお、化合物2~26は以下に示す化合物である。
陽極としてITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を、38mm×46mmに切断し、エッチングを行った。得られた基板を、“セミコクリーン”56(商品名、フルウチ化学(株)製)を用いて15分間超音波洗浄してから、超純水で洗浄した。この基板を、素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm蒸着し、次いで正孔輸送層として、HT-1を50nm蒸着した。次に、発光層として、ホスト材料H-1、ドーパント材料D-1の混合層を、ドープ濃度が5重量%になるようにして20nmの厚さに蒸着した。次に、電子輸送層として、ET-1と2E-1を蒸着速度比がET-1と2E-1=1:1となるように35nmの厚さに蒸着した。次に、電子注入層として、前記化合物1と、ドーパントである金属元素Liとを、蒸着速度比が化合物1:Li=99:1となるように10nm蒸着した。その後、アルミニウムを60nm蒸着して陰極とし、5mm×5mm角の有機EL素子を作製した。
用いる化合物および化合物と金属元素の蒸着速度比を表2に記載の通りに変更したこと以外は実施例13と同様にして有機EL素子を作製した。各実施例および比較例の結果を表2に示す。
陽極としてITO透明導電膜を165nm堆積させたガラス基板(ジオマテック(株)製、11Ω/□、スパッタ品)を、38mm×46mmに切断し、エッチングを行った。得られた基板を、“セミコクリーン”56(商品名、フルウチ化学(株)製)を用いて15分間超音波洗浄してから、超純水で洗浄した。この基板を、素子を作製する直前に1時間UV-オゾン処理し、真空蒸着装置内に設置して、装置内の真空度が5×10-4Pa以下になるまで排気した。抵抗加熱法によって、まず正孔注入層として、HAT-CN6を5nm蒸着した。次いで、正孔注入層上に正孔輸送層、発光層および電子輸送層からなる、発光ユニット(第一の発光ユニット)を形成した。
用いる化合物および化合物と金属元素の蒸着速度比を表3に記載の通りに変更したこと以外は実施例25と同様にして有機EL素子を作製した。実施例37ではn型電荷発生層として化合物1、ET-2金属元素Liとを、蒸着速度比が化合物1:ET-2:Li=49.5:49.5:1となるように10nm蒸着した。実施例38では発光層として、ホスト材料H-1、ドーパント材料D-2の混合層を、ドープ濃度が5重量%となるようにして20nmの厚さに蒸着した。各実施例および比較例の結果を表3に示す。なおD-2およびET-2は以下に示す化合物である。
電子輸送層の形成において、ET-1にかえて前記化合物1を用いたこと、および、n型電荷発生層の形成において、化合物1にかえてET-2を用いたこと以外は実施例25と同様にして有機EL素子を作製した。
用いる化合物および化合物と金属元素の蒸着速度比を表4に記載の通りに変更したこと以外は実施例39と同様にして有機EL素子を作製した。各実施例および比較例の結果を表4に示す。
用いる化合物、金属元素の種類および蒸着速度比を表5に記載の通りに変更したこと以外は実施例25と同様にして有機EL素子を作製した。
Claims (18)
- 前記一般式(1)においてX3が窒素原子である、請求項1に記載の有機EL素子用材料。
- 前記一般式(1)においてnが1である、請求項1または2に記載の有機EL素子用材料。
- 前記一般式(1)においてAがフェニル基である、請求項1~3のいずれかに記載の有機EL素子用材料。
- 前記一般式(1)においてnが0である、請求項1または2に記載の有機EL素子用材料。
- 前記一般式(1)においてL1またはL2がナフチレン基である、請求項1~5のいずれかに記載の有機EL素子用材料。
- 前記一般式(1)においてL2が単結合である、請求項1~6のいずれかに記載の有機EL素子用材料。
- 陽極と陰極との間に少なくとも電子輸送層と発光層とが存在し、電気エネルギーにより発光する発光素子であって、該電子輸送層が請求項1~7のいずれかに記載の有機EL素子用材料を含有する有機EL素子。
- 前記電子輸送層がさらにアルカリ金属錯体化合物を含有する、請求項8に記載の有機EL素子。
- 陽極と陰極との間に少なくとも電荷発生層と発光層とが存在し、電気エネルギーにより発光する発光素子であって、該電荷発生層が請求項1~7のいずれかに記載の有機EL素子用材料を含有する有機EL素子。
- 前記電荷発生層がさらにフェナントロリン二量体を含有する請求項10に記載の有機EL素子。
- 前記電荷発生層がさらにアルカリ金属または希土類金属を含有する請求項10または11に記載の有機EL素子。
- 前記アルカリ金属がLiである請求項12に記載の有機EL素子。
- 前記希土類金属がYbである請求項12に記載の有機EL素子。
- 陽極と陰極との間に少なくとも電子注入層と発光層とが存在し、電気エネルギーにより発光する発光素子であって、該電子注入層が請求項1~7のいずれかに記載の化合物を含有する有機EL素子。
- 前記発光層が下記一般式(2)で表される化合物を含有する請求項8~15のいずれかに記載の有機EL素子:
- 請求項8~16のいずれかに記載のEL素子を含む表示装置。
- 請求項8~16のいずれかに記載のEL素子を含む照明装置。
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KR1020237025027A KR20230151982A (ko) | 2021-02-24 | 2022-01-28 | 유기 el 소자용 재료, 유기 el 소자, 표시 장치 및조명 장치 |
EP22759239.1A EP4300610A1 (en) | 2021-02-24 | 2022-01-28 | Organic el element material, organic el element, display device, and illumination device |
CN202280007975.XA CN116583520A (zh) | 2021-02-24 | 2022-01-28 | 有机el元件用材料、有机el元件、显示装置及照明装置 |
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WO2023190159A1 (ja) * | 2022-04-01 | 2023-10-05 | 東レ株式会社 | 化合物、それを用いた発光素子材料および発光素子、光電変換素子材料、色変換組成物、色変換シート、光源ユニット、表示装置、照明装置 |
KR102610656B1 (ko) * | 2023-08-02 | 2023-12-07 | 주식회사 진웅산업 | 신규 화합물 및 이를 포함하는 유기 발광 소자 |
WO2024161905A1 (ja) * | 2023-01-30 | 2024-08-08 | 東レ株式会社 | 化合物、有機el素子、表示装置および照明装置 |
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KR20230151982A (ko) | 2023-11-02 |
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TW202233618A (zh) | 2022-09-01 |
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