WO2010113755A1 - 燐光発光素子用材料及びこれを用いた有機電界発光素子 - Google Patents
燐光発光素子用材料及びこれを用いた有機電界発光素子 Download PDFInfo
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- WO2010113755A1 WO2010113755A1 PCT/JP2010/055223 JP2010055223W WO2010113755A1 WO 2010113755 A1 WO2010113755 A1 WO 2010113755A1 JP 2010055223 W JP2010055223 W JP 2010055223W WO 2010113755 A1 WO2010113755 A1 WO 2010113755A1
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- 239000000463 material Substances 0.000 title claims abstract description 74
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims abstract description 35
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 25
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000002019 doping agent Substances 0.000 claims abstract description 12
- 125000003545 alkoxy group Chemical group 0.000 claims abstract description 9
- 125000002252 acyl group Chemical group 0.000 claims abstract description 8
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 136
- 125000004432 carbon atom Chemical group C* 0.000 claims description 75
- 230000005525 hole transport Effects 0.000 claims description 28
- 230000000903 blocking effect Effects 0.000 claims description 23
- PJVZQNVOUCOJGE-CALCHBBNSA-N chembl289853 Chemical compound N1([C@H]2CC[C@H](O2)N2[C]3C=CC=CC3=C3C2=C11)C2=CC=C[CH]C2=C1C1=C3C(=O)N(C)C1=O PJVZQNVOUCOJGE-CALCHBBNSA-N 0.000 claims description 21
- 239000012044 organic layer Substances 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 239000001257 hydrogen Substances 0.000 claims description 19
- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 10
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 claims description 5
- 238000005401 electroluminescence Methods 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 27
- 238000002347 injection Methods 0.000 description 23
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 18
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 16
- 125000003118 aryl group Chemical group 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 12
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- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 12
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- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 12
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- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 11
- UJOBWOGCFQCDNV-UHFFFAOYSA-N Carbazole Natural products C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 11
- 125000001424 substituent group Chemical group 0.000 description 11
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 10
- XSCHRSMBECNVNS-UHFFFAOYSA-N quinoxaline Chemical compound N1=CC=NC2=CC=CC=C21 XSCHRSMBECNVNS-UHFFFAOYSA-N 0.000 description 10
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- 239000011777 magnesium Substances 0.000 description 9
- 229910052749 magnesium Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 9
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- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical class C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 8
- DZBUGLKDJFMEHC-UHFFFAOYSA-N acridine Chemical compound C1=CC=CC2=CC3=CC=CC=C3N=C21 DZBUGLKDJFMEHC-UHFFFAOYSA-N 0.000 description 8
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 8
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 6
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- 239000007772 electrode material Substances 0.000 description 6
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- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 5
- WJFKNYWRSNBZNX-UHFFFAOYSA-N 10H-phenothiazine Chemical compound C1=CC=C2NC3=CC=CC=C3SC2=C1 WJFKNYWRSNBZNX-UHFFFAOYSA-N 0.000 description 4
- TZMSYXZUNZXBOL-UHFFFAOYSA-N 10H-phenoxazine Chemical compound C1=CC=C2NC3=CC=CC=C3OC2=C1 TZMSYXZUNZXBOL-UHFFFAOYSA-N 0.000 description 4
- 238000005160 1H NMR spectroscopy Methods 0.000 description 4
- VFUDMQLBKNMONU-UHFFFAOYSA-N 9-[4-(4-carbazol-9-ylphenyl)phenyl]carbazole Chemical group C12=CC=CC=C2C2=CC=CC=C2N1C1=CC=C(C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=C1 VFUDMQLBKNMONU-UHFFFAOYSA-N 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
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- 238000000295 emission spectrum Methods 0.000 description 4
- 229910052738 indium Inorganic materials 0.000 description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 4
- 150000004866 oxadiazoles Chemical class 0.000 description 4
- RDOWQLZANAYVLL-UHFFFAOYSA-N phenanthridine Chemical compound C1=CC=C2C3=CC=CC=C3C=NC2=C1 RDOWQLZANAYVLL-UHFFFAOYSA-N 0.000 description 4
- 229950000688 phenothiazine Drugs 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 230000006798 recombination Effects 0.000 description 4
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- VEPOHXYIFQMVHW-XOZOLZJESA-N 2,3-dihydroxybutanedioic acid (2S,3S)-3,4-dimethyl-2-phenylmorpholine Chemical compound OC(C(O)C(O)=O)C(O)=O.C[C@H]1[C@@H](OCCN1C)c1ccccc1 VEPOHXYIFQMVHW-XOZOLZJESA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 3
- PCNDJXKNXGMECE-UHFFFAOYSA-N Phenazine Natural products C1=CC=CC2=NC3=CC=CC=C3N=C21 PCNDJXKNXGMECE-UHFFFAOYSA-N 0.000 description 3
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- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 3
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- 239000010949 copper Substances 0.000 description 3
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 3
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- SMNRFWMNPDABKZ-WVALLCKVSA-N [[(2R,3S,4R,5S)-5-(2,6-dioxo-3H-pyridin-3-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [[[(2R,3S,4S,5R,6R)-4-fluoro-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-hydroxyphosphoryl]oxy-hydroxyphosphoryl] hydrogen phosphate Chemical compound OC[C@H]1O[C@H](OP(O)(=O)OP(O)(=O)OP(O)(=O)OP(O)(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)C2C=CC(=O)NC2=O)[C@H](O)[C@@H](F)[C@@H]1O SMNRFWMNPDABKZ-WVALLCKVSA-N 0.000 description 2
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- UEEXRMUCXBPYOV-UHFFFAOYSA-N iridium;2-phenylpyridine Chemical compound [Ir].C1=CC=CC=C1C1=CC=CC=N1.C1=CC=CC=C1C1=CC=CC=N1.C1=CC=CC=C1C1=CC=CC=N1 UEEXRMUCXBPYOV-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- UKVIEHSSVKSQBA-UHFFFAOYSA-N methane;palladium Chemical compound C.[Pd] UKVIEHSSVKSQBA-UHFFFAOYSA-N 0.000 description 1
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical group C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 1
- KKFHAJHLJHVUDM-UHFFFAOYSA-N n-vinylcarbazole Chemical class C1=CC=C2N(C=C)C3=CC=CC=C3C2=C1 KKFHAJHLJHVUDM-UHFFFAOYSA-N 0.000 description 1
- AODWRBPUCXIRKB-UHFFFAOYSA-N naphthalene perylene Chemical group C1=CC=CC2=CC=CC=C21.C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 AODWRBPUCXIRKB-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical group C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 150000004986 phenylenediamines Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920003227 poly(N-vinyl carbazole) Chemical class 0.000 description 1
- 229920000553 poly(phenylenevinylene) Polymers 0.000 description 1
- 229920000548 poly(silane) polymer Chemical class 0.000 description 1
- 229920002098 polyfluorene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920000123 polythiophene Chemical class 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- LVTJOONKWUXEFR-FZRMHRINSA-N protoneodioscin Natural products O(C[C@@H](CC[C@]1(O)[C@H](C)[C@@H]2[C@]3(C)[C@H]([C@H]4[C@@H]([C@]5(C)C(=CC4)C[C@@H](O[C@@H]4[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@@H](O)[C@H](O[C@H]6[C@@H](O)[C@@H](O)[C@@H](O)[C@H](C)O6)[C@H](CO)O4)CC5)CC3)C[C@@H]2O1)C)[C@H]1[C@H](O)[C@H](O)[C@H](O)[C@@H](CO)O1 LVTJOONKWUXEFR-FZRMHRINSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical class C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 1
- 150000004867 thiadiazoles Chemical class 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 125000005259 triarylamine group Chemical group 0.000 description 1
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Definitions
- the present invention relates to a phosphorescent light emitting element material for an organic electroluminescent element and an organic electroluminescent element using the same, and more particularly to a thin film device that emits light by applying an electric field to a light emitting layer made of an organic compound. Is.
- an organic electroluminescent element (hereinafter referred to as an organic EL element) is composed of a light emitting layer and a pair of counter electrodes sandwiching the layer as the simplest structure. That is, in an organic EL element, when an electric field is applied between both electrodes, electrons are injected from the cathode, holes are injected from the anode, and these are recombined in the light emitting layer to emit light. .
- CBP 4,4′-bis (9-carbazolyl) biphenyl
- Ir (ppy) 3 2,4′-bis (9-carbazolyl) biphenyl
- a host material having high triplet excitation energy and balanced in both charge (hole / electron) injection and transport characteristics is required. Further, a compound that is electrochemically stable and has high heat resistance and excellent amorphous stability is desired, and further improvement is required.
- Patent Document 3 discloses the following indolocarbazole compound (A) as a hole transport material.
- Patent Document 3 recommends the use of a compound (A) having an indolocarbazole skeleton and a triarylamine skeleton having a specific structure as a hole transport material, it only discloses an example in a fluorescent light-emitting device. Yes, it does not disclose the use as a phosphorescent light emitting device material.
- Patent Document 4 discloses indolocarbazole compounds (B) and (C) as shown below as hole transport materials.
- An object of this invention is to provide the practically useful organic EL element which has high efficiency and high drive stability in view of the said present condition, and a compound suitable for it.
- the present invention relates to a phosphorescent light emitting device material comprising an indolocarbazole compound represented by the general formula (1).
- each A 1 is independently an aromatic hydrocarbon group having 6 to 50 carbon atoms, an aromatic heterocyclic group having 3 to 50 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or 3 carbon atoms.
- R 1 independently represents hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms.
- X independently represents methine or nitrogen, and in a ring containing three X, at least one of X is nitrogen.
- Y represents a direct bond, —NA 4 —, —O— or —S—.
- a 2 , A 3 and A 4 are each independently an aromatic hydrocarbon group having 6 to 38 carbon atoms, an aromatic heterocyclic group having 3 to 37 carbon atoms, An alkyl group having 1 to 10 carbon atoms or a cycloalkyl group having 3 to 11 carbon atoms is represented.
- an indolocarbazole compound in which at least one of A 1 is represented by the formula (1a) is preferable. Moreover, it is preferable that one or two of A 1 is an aromatic heterocyclic group represented by the formula (1b) and not an aromatic heterocyclic group represented by the formula (1a).
- the present invention also relates to an organic electroluminescent device having an organic layer containing the above phosphorescent light emitting device material in an organic electroluminescent device in which an anode, a plurality of organic layers and a cathode are laminated on a substrate.
- Another embodiment of the present invention relates to a material for a phosphorescent light emitting device comprising an indolocarbazole derivative represented by the general formula (11) or the general formula (12).
- X independently represents methine or nitrogen, and in a ring containing three X, at least one of X is nitrogen.
- a 5 represents an aromatic hydrocarbon group, an aromatic heterocyclic group having 3-37 carbon atoms, an alkyl group or a cycloalkyl group having a carbon number of 3 to 11 1 to 10 carbon atoms having from 6 to 38 carbon atoms,
- a 6 Represents an aromatic hydrocarbon group having 6 to 18 carbon atoms, an aromatic heterocyclic group having 3 to 17 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms.
- At least one of A 5 and A 6 is an aromatic hydrocarbon group having 10 to 18 carbon atoms or an aromatic heterocyclic group having 6 to 17 carbon atoms formed from two or more rings.
- R 2 independently represents hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms.
- the phosphorescent device material composed of the indolocarbazole derivative represented by the general formula (11) or (12) is organic like the phosphorescent device material composed of the indolocarbazole derivative represented by the general formula (1). Included in the organic layer of the electroluminescent element.
- it is contained in at least one layer selected from the group consisting of a light emitting layer, a hole transport layer, an electron transport layer and a hole blocking layer. More preferably, it is contained in a light emitting layer or a hole transport layer containing a phosphorescent dopant.
- the material for a phosphorescent light emitting device of the present invention is an indolocarbazole compound represented by the general formula (1).
- the skeleton of this indolocarbazole compound focuses on the central benzene ring that condenses with two nitrogen-containing 5-membered rings.
- the other nitrogen-containing five-membered ring has a structure in which nitrogen is bonded, and is considered to bring about excellent effects as described later.
- each A 1 independently represents an aromatic hydrocarbon group having 6 to 50 carbon atoms, an aromatic heterocyclic group having 3 to 50 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or 3 carbon atoms.
- A1 is an aromatic hydrocarbon group having 6 to 38 carbon atoms, an aromatic heterocyclic group having 3 to 37 carbon atoms, an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, It is a group represented by 1a) or formula (1b).
- a 1 is an aromatic hydrocarbon group or an aromatic heterocyclic group
- specific examples of the aromatic hydrocarbon group or the aromatic heterocyclic group include benzene, naphthalene, fluorene, anthracene, phenanthrene.
- a monovalent group generated by removing one hydrogen from an aromatic compound in which a plurality of these aromatic rings are linked together such as benzene, pyridine, pyrimidine, triazine, naphthalene, or the like.
- a plurality of the aromatic rings are connected, they may be the same or different.
- Specific examples of the monovalent group generated by removing one hydrogen from the aromatic compound in which a plurality of aromatic rings are connected include biphenyl, terphenyl, bipyridine, bipyrimidine, vitriazine, bistriazylbenzene, binaphthalene, and phenylpyridine.
- a group formed by removing hydrogen from diphenylpyridine, diphenylpyrimidine, diphenyltriazine, phenylcarbazole, pyridylcarbazole, etc., and the connecting position of the indolocarbazole to be bonded to nitrogen is not limited. It may be a ring at the center.
- These groups may have a substituent, and when they have a substituent, preferred substituents are an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 2 carbon atoms, and an acetyl group.
- the calculation of the number of carbon atoms includes the number of carbon atoms of the substituent when it has a substituent.
- the monovalent group generated by connecting a plurality of aromatic rings is represented by the following formula, for example.
- Ar 1 to Ar 6 represent a substituted or unsubstituted aromatic ring
- the aromatic hydrocarbon group means that Ar 1 in the formulas (13) to (15) is an aromatic hydrocarbon
- the aromatic heterocyclic group means that Ar 1 is an aromatic heterocyclic group.
- a 1 in the general formula (1) is an alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. , Nonyl group, and decyl group.
- the alkyl group may be linear or branched.
- a 1 is a cycloalkyl group having 3 to 11 carbon atoms
- a cyclohexyl group is mentioned, Preferably a cyclohexyl group and a methylcyclohexyl group are mentioned.
- X independently represents methine or nitrogen, and at least one of X present in the ring containing X is nitrogen.
- Y represents a direct bond, —NA 5 —, —O— or —S—.
- a direct bond is preferred.
- a 2 , A 3 and A 4 are each independently an aromatic hydrocarbon group having 6 to 38 carbon atoms, an aromatic heterocyclic group having 3 to 37 carbon atoms, or 1 carbon atom.
- a 2 , A 3 and A 4 are each an aromatic hydrocarbon group having 6 to 18 carbon atoms, an aromatic heterocyclic group having 3 to 17 carbon atoms, an alkyl group having 1 to 4 carbon atoms, or 3 to 8 carbon atoms.
- the cycloalkyl group are each independently an aromatic hydrocarbon group having 6 to 38 carbon atoms, an aromatic heterocyclic group having 3 to 37 carbon atoms, or 1 carbon atom.
- a 2 , A 3 and A 4 are an aromatic hydrocarbon group or an aromatic heterocyclic group include benzene, naphthalene, fluorene, anthracene, phenanthrene, fluoranthene, pyrene, chrysene, pyridine, pyrimidine, triazine , Indole, quinoline, isoquinoline, quinoxaline, naphthyridine, carbazole, acridine, phenoxazine, phenothiazine, or a monovalent group generated by removing one hydrogen from an aromatic compound in which a plurality of these aromatic rings are linked, Is a monovalent group formed by removing one hydrogen from an aromatic compound in which a plurality of these aromatic rings are connected, such as benzene, pyridine, pyrimidine, triazine, naphthalene, quinoline, isoquinoline, quinoxaline, naphthyridine, anthracene, phenant
- a plurality of the aromatic rings When a plurality of the aromatic rings are connected, they may be the same or different.
- Specific examples of the monovalent group generated by removing one hydrogen from the aromatic compound in which a plurality of aromatic rings are connected include biphenyl, terphenyl, bipyridine, bipyrimidine, vitriazine, bistriazylbenzene, binaphthalene, and phenylpyridine.
- a group formed by removing hydrogen from diphenylpyridine, diphenylpyrimidine, diphenyltriazine, phenylcarbazole, pyridylcarbazole, etc., and the connecting position of the indolocarbazole to be bonded to nitrogen is not limited. It may be a ring at the center.
- These groups may have a substituent, and when they have a substituent, preferred substituents are an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 2 carbon atoms, and an
- a 1 there are two of A 1, but one or two of A 1 is required to be an aromatic heterocyclic group represented by the formula (1a) or formula (1b). Furthermore, at least one A 1 needs to have a condensed ring structure.
- This condensed ring structure may be directly bonded to the N atom of the indolocarbazole ring, or may be bonded to a group having no condensed ring structure bonded to the N atom.
- the aromatic heterocyclic group represented by the formula (1b) has a condensed ring structure, the above requirement is satisfied by having one or more of them.
- Aromatic heterocyclic group represented by the formula (1a) is, if it has substituents A 2 is a condensed ring structure, but to satisfy the above requirements, when the substituent A 2 does not have a condensed ring structure, other One A 1 needs to be a group having a condensed ring structure.
- the condensed ring structure is preferably an aromatic hydrocarbon group or an aromatic heterocyclic group formed from two or more rings.
- the aromatic heterocyclic group represented by the formula (1b) is an aromatic heterocyclic group having a condensed ring structure. Preferred as a cyclic group.
- At least one of A 1 and A 2 has a condensed ring structure formed from two or more rings.
- the condensed ring structure means a case where Ar 1 in formulas (13) to (15) is formed from two or more rings. That is, A 1 represents a case where a ring directly bonded to nitrogen on indolocarbazole is formed from two or more rings, and A 2 represents two or more rings directly bonded to an aromatic heterocycle.
- a 1 and A 2 may be linked together including an aromatic ring which is not a condensed ring structure as mentioned above.
- aromatic hydrocarbon group or aromatic heterocyclic group having a condensed ring structure examples include naphthalene, quinoline, isoquinoline, quinoxaline, naphthyridine, anthracene, phenanthrene, pyrene, carbazole, phenanthridine, phenanthroline, acridine, and phenazine.
- Monovalent groups formed by removing one hydrogen from phenoxazine, phenothiazine, and antilysine more preferably one from naphthalene, quinoline, isoquinoline, pyrene, or carbazole, acridine, phenazine, phenoxazine, or phenothiazine. And a monovalent group generated by removing hydrogen.
- each of the plurality of R 1 independently represents hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms.
- Preferred are hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 2 carbon atoms, or an acyl group having 2 carbon atoms. More preferably, it is hydrogen.
- the phosphorescent light emitting device material of the present invention is preferably an indolocarbazole compound represented by the general formula (11) or (12).
- X independently represents methine or nitrogen, and in a ring containing three X, at least one of X is nitrogen.
- a 5 represents an aromatic hydrocarbon group, an aromatic heterocyclic group having 3-37 carbon atoms, an alkyl group or a cycloalkyl group having a carbon number of 3 to 11 1 to 10 carbon atoms having from 6 to 38 carbon atoms,
- a 6 Each independently represents an aromatic hydrocarbon group having 6 to 18 carbon atoms, an aromatic heterocyclic group having 3 to 17 carbon atoms, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms.
- a 6 is at least one of an aromatic hydrocarbon group having 6 to 18 carbon atoms and an aromatic heterocyclic group having 3 to 17 carbon atoms.
- R 2 independently represents hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an acyl group having 2 to 6 carbon atoms.
- a 5 , A 6 and R 2 represent an aromatic hydrocarbon group, an aromatic heterocyclic group, an alkyl group, a cycloalkyl group or an acyl group, these are represented by the general formula This is the same as the explanation given in (1). However, when there is a limitation on the number of carbons, the number is not other than the number of carbons. Further, at least one of A 5 and A 6 preferably has a condensed ring structure formed from two or more rings.
- the indolocarbazole compound represented by the general formula (1) can be synthesized by selecting a raw material according to the structure of the target compound and using a known method.
- indolocarbazole compound As a method for synthesizing the indolocarbazole compound, hydrogen chloride gas is allowed to act on indole, a dimer is synthesized using palladium carbon, and N, N-dimethylacetaldehyde diethyl acetal is reacted in an acetic acid solvent to produce indolo [ There is a method of synthesizing 3,2-a] carbazole and then introducing various substituents by a coupling reaction.
- indolocarbazole compound represented by the general formula (1) Specific examples of the indolocarbazole compound represented by the general formula (1) are shown below, but are not limited thereto.
- the phosphorescent light emitting device material of the present invention provides an excellent organic electroluminescent device by being contained in an organic layer of an organic EL device in which an anode, an organic layer and a cathode are laminated on a substrate.
- a light emitting layer, a hole transport layer, an electron transport layer and a hole blocking layer are suitable. More preferably, it is contained in the light-emitting layer, but more preferably, it is contained as a host material of the light-emitting layer containing a phosphorescent dopant.
- the organic EL device of the present invention has a plurality of organic layers between an anode and a cathode laminated on a substrate. At least one of the plurality of organic layers is a light emitting layer that emits phosphorescence, and at least one of the organic layers is a layer containing the material for a phosphorescent light emitting element of the present invention.
- the phosphorescent light emitting device material of the present invention is included in the light emitting layer. More preferably, the phosphorescent light emitting device material of the present invention is contained in the light emitting layer together with a phosphorescent dopant.
- the structure of the organic EL element of the present invention will be described with reference to the drawings.
- the structure of the organic EL element of the present invention is not limited to the illustrated one.
- FIG. 1 is a cross-sectional view schematically showing a structural example of a general organic EL element used in the present invention, wherein 1 is a substrate, 2 is an anode, 3 is a hole injection layer, 4 is a hole transport layer, Represents a light emitting layer, 6 represents an electron transport layer, and 7 represents a cathode.
- the organic EL device of the present invention may have an exciton blocking layer adjacent to the light emitting layer, and may have an electron blocking layer between the light emitting layer and the hole injection layer.
- the exciton blocking layer can be inserted on either the anode side or the cathode side of the light emitting layer, or both can be inserted simultaneously.
- the organic EL device of the present invention has a substrate, an anode, a light emitting layer and a cathode as essential layers, but it is preferable to have a hole injecting and transporting layer and an electron injecting and transporting layer in layers other than the essential layers, and further emit light. It is preferable to have a hole blocking layer between the layer and the electron injecting and transporting layer.
- the hole injection / transport layer means either or both of a hole injection layer and a hole transport layer
- the electron injection / transport layer means either or both of an electron injection layer and an electron transport layer.
- the organic EL element of the present invention is preferably supported on a substrate.
- the substrate is not particularly limited as long as it is conventionally used for an organic EL element.
- a substrate made of glass, transparent plastic, quartz, or the like can be used.
- an electrode material made of a metal, an alloy, an electrically conductive compound, or a mixture thereof having a high work function (4 eV or more) is preferably used.
- an electrode substance include conductive transparent materials such as metals such as Au, CuI, indium tin oxide (ITO), SnO 2 , and ZnO.
- conductive transparent materials such as metals such as Au, CuI, indium tin oxide (ITO), SnO 2 , and ZnO.
- an amorphous material such as IDIXO (In 2 O 3 —ZnO) capable of forming a transparent conductive film may be used.
- these electrode materials may be formed into a thin film by a method such as vapor deposition or sputtering, and a pattern having a desired shape may be formed by a photolithography method, or when the pattern accuracy is not required (about 100 ⁇ m or more) ), A pattern may be formed through a mask having a desired shape when the electrode material is deposited or sputtered. Or when using the substance which can be apply
- the cathode a material having a low work function (4 eV or less) metal (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof as an electrode material is used.
- an electron injecting metal a material having a low work function (4 eV or less) metal
- an alloy a material having a low work function (4 eV or less) metal
- an alloy a material having a low work function (4 eV or less) metal
- an alloy referred to as an electron injecting metal
- an alloy referred to as an electron injecting metal
- a mixture of an electron injecting metal and a second metal which is a stable metal having a larger work function than this for example, a magnesium / silver mixture, Magnesium / aluminum mixtures, magnesium / indium mixtures, aluminum / aluminum oxide (Al 2 O 3 ) mixtures, lithium / aluminum mixtures, aluminum and the like are preferred.
- the cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering.
- the sheet resistance as the cathode is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected in the range of 10 nm to 5 ⁇ m, preferably 50 to 200 nm.
- the light emission luminance is improved, which is convenient.
- a transparent or semi-transparent cathode can be produced by producing the conductive transparent material mentioned in the description of the anode on the cathode after producing the metal with a thickness of 1 to 20 nm on the cathode.
- an element in which both the anode and the cathode are transmissive can be manufactured.
- the light emitting layer is a phosphorescent light emitting layer and includes a phosphorescent dopant and a host material.
- the phosphorescent dopant material preferably contains an organometallic complex containing at least one metal selected from ruthenium, rhodium, palladium, silver, rhenium, osmium, iridium, platinum and gold. Such organometallic complexes are known in the prior art documents and the like, and these can be selected and used.
- Preferable phosphorescent dopants include complexes such as Ir (ppy) 3 having a noble metal element such as Ir as a central metal, complexes such as Ir (bt) 2 ⁇ acac3, and complexes such as PtOEt3. Specific examples of these complexes are shown below, but are not limited to the following compounds.
- the amount of the phosphorescent dopant contained in the light emitting layer is preferably 1 to 50% by weight, more preferably 5 to 30% by weight.
- the host material in the light emitting layer it is preferable to use an indolocarbazole compound represented by the general formula (1) according to the present invention.
- the material used for the light emitting layer may be a host material other than the indolocarbazole compound.
- An indolocarbazole compound and another host material may be used in combination.
- a plurality of known host materials may be used in combination.
- the known host compound that can be used is preferably a compound that has a hole transporting ability and an electron transporting ability, prevents the emission of longer wavelengths, and has a high glass transition temperature.
- host materials are known from a large number of patent documents, and can be selected from them.
- Specific examples of the host material are not particularly limited, but include indole derivatives, carbazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine.
- arylamine derivatives amino-substituted chalcone derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aromatic tertiary amine compounds, styrylamine compounds, aromatic dimethylidene compounds, porphyrin compounds, anthraquino Heterocyclic tetracarboxylic acid anhydrides such as dimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, naphthalene perylene,
- the injection layer is a layer provided between the electrode and the organic layer for lowering the driving voltage and improving the luminance of light emission, and includes a hole injection layer and an electron injection layer, And between the cathode and the light emitting layer or the electron transport layer.
- the injection layer can be provided as necessary.
- the hole blocking layer has a function of an electron transport layer in a broad sense, and is made of a hole blocking material that has a function of transporting electrons and has a remarkably small ability to transport holes. The probability of recombination of electrons and holes can be improved by blocking.
- the indolocarbazole compound represented by the general formula (1) according to the present invention for the hole blocking layer.
- the indolocarbazole compound represented by the general formula (1) according to the present invention for the hole blocking layer.
- a hole blocking layer material may be used.
- the material of the electron carrying layer mentioned later can be used as needed.
- the electron blocking layer is made of a material that has a function of transporting holes and has a very small ability to transport electrons.
- the electron blocking layer blocks the electrons while transporting holes, and the probability of recombination of electrons and holes. Can be improved.
- the material for the electron blocking layer As the material for the electron blocking layer, the material for the hole transport layer described later can be used as necessary.
- the thickness of the electron blocking layer is preferably 3 to 100 nm, more preferably 5 to 30 nm.
- the exciton blocking layer is a layer for preventing excitons generated by recombination of holes and electrons in the light emitting layer from diffusing into the charge transport layer. It becomes possible to efficiently confine in the light emitting layer, and the light emission efficiency of the device can be improved.
- the exciton blocking layer can be inserted on either the anode side or the cathode side adjacent to the light emitting layer, or both can be inserted simultaneously.
- Examples of the material for the exciton blocking layer include 1,3-dicarbazolylbenzene (mCP) and bis (2-methyl-8-quinolinolato) -4-phenylphenolato aluminum (III) (BAlq). It is done.
- mCP 1,3-dicarbazolylbenzene
- BAlq bis (2-methyl-8-quinolinolato) -4-phenylphenolato aluminum
- the hole transport layer is made of a hole transport material having a function of transporting holes, and the hole transport layer can be provided as a single layer or a plurality of layers.
- the hole transport material has either hole injection or transport or electron barrier properties, and may be either organic or inorganic. Although it is preferable to use the indolocarbazole compound represented by the general formula (1) according to the present invention for the hole transport layer, any one of conventionally known compounds can be selected and used.
- Examples of known hole transport materials that can be used include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, Examples include styryl anthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aniline copolymers, and conductive polymer oligomers, particularly thiophene oligomers. Porphyrin compounds, aromatic tertiary amine compounds, and styryl. It is preferable to use an amine compound, and it is more preferable to use an aromatic tertiary amine compound.
- the electron transport layer is made of a material having a function of transporting electrons, and the electron transport layer can be provided as a single layer or a plurality of layers.
- an electron transport material which may also serve as a hole blocking material
- the indolocarbazole compound represented by the general formula (1) according to the present invention for the electron transport layer, any one of conventionally known compounds can be selected and used. Examples thereof include nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, and oxadiazole derivatives.
- a thiadiazole derivative in which the 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 an electron transport material.
- a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.
- An indolocarbazole compound to be a phosphorescent light emitting element material was synthesized by the route shown below.
- the compound number corresponds to the number given to the above chemical formula.
- Example 3 Each thin film was laminated at a vacuum degree of 4.0 ⁇ 10 ⁇ 4 Pa by a vacuum deposition method on a glass substrate on which an anode made of ITO having a thickness of 150 nm was formed.
- copper phthalocyanine (CuPc) was formed as a hole injection layer on ITO with a thickness of 25 nm.
- NPB 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl
- compound 34 as a host component of the light emitting layer and bis (2- (2′-benzo [4,5-a] thienyl) pyridinato-N, C3) iridium (G) as a guest component Acetylacetonate) [(Btp) 2 Iracac] was co-deposited from different deposition sources to a thickness of 47.5 nm. At this time, the concentration of (Btp) 2 Iracac was 8.0 wt%. Next, tris (8-hydroxyquinolinato) aluminum (III) (Alq3) was formed to a thickness of 30 nm as an electron transporting layer.
- lithium fluoride (LiF) was formed to a thickness of 1 nm as an electron injection layer.
- Al aluminum as an electrode was formed to a thickness of 200 nm to produce an organic EL element.
- the organic EL element had the light emission characteristics as shown in Table 1.
- Table 1 the luminance, voltage, and luminous efficiency show values at 10 mA / cm 2 .
- the maximum wavelength of the device emission spectrum was 620 nm, and it was found that light emission from (Btp) 2 Iracac was obtained.
- Example 4 An organic EL device was produced in the same manner as in Example 3 except that Compound 33 was used as the host component of the light emitting layer.
- Example 5 An organic EL device was prepared in the same manner as in Example 3 except that Compound 36 was used as the host component of the light emitting layer.
- Example 6 An organic EL device was produced in the same manner as in Example 3 except that Compound 71 was used as the host component of the light emitting layer.
- Example 7 An organic EL device was produced in the same manner as in Example 3 except that Compound 72 was used as the host component of the light emitting layer.
- Example 8 An organic EL device was produced in the same manner as in Example 3 except that Compound 22 was used as the host component of the light emitting layer.
- Example 9 An organic EL device was produced in the same manner as in Example 3 except that Compound 49 was used as the host component of the light emitting layer.
- Example 10 An organic EL device was produced in the same manner as in Example 3 except that Compound 87 was used as the host component of the light emitting layer.
- Comparative Example 1 An organic EL device was produced in the same manner as in Example 3 except that bis (2-methyl-8-quinolinolato) -4-phenylphenolato aluminum (III) (BAlq) was used as the host component of the light emitting layer.
- Comparative Example 2 An organic EL device was prepared in the same manner as in Example 3 except that the following compound C was used as the host component of the light emitting layer.
- Example 11 Each thin film was laminated at a vacuum degree of 4.0 ⁇ 10 ⁇ 4 Pa by a vacuum deposition method on a glass substrate on which an anode made of ITO having a thickness of 150 nm was formed.
- CuPc was formed as a hole injection layer on ITO with a thickness of 25 nm
- compound 77 was formed as a hole transport layer with a thickness of 30 nm.
- 2,6-di (4-carbazolylphenyl) pyridine and Ir (PPy) 3 are co-deposited as a light emitting layer from different evaporation sources to form a thickness of 40 nm. did.
- the concentration of Ir (PPy) 3 was 6.0 wt%.
- Alq3 was formed to a thickness of 20 nm as an electron transport layer.
- lithium fluoride (LiF) was formed to a thickness of 0.5 nm as an electron injection layer.
- Al aluminum as an electrode was formed to a thickness of 170 nm to produce an organic EL element.
- the organic EL element had the light emission characteristics as shown in Table 1.
- Table 1 the luminance, voltage, and luminous efficiency, shown when driving at 2.5 mA / cm 2, also the brightness half time was evaluated at constant current driving of 20 mA / cm 2, the initial this result The value converted in the case of luminance 1000 cd / m 2 is shown.
- the maximum wavelength of the device emission spectrum was 517 nm, and it was found that light emission from Ir (PPy) 3 was obtained.
- Example 12 An organic EL device was produced in the same manner as in Example 11 except that Compound 78 was used as the hole transport layer material.
- Example 13 An organic EL device was produced in the same manner as in Example 11 except that Compound 81 was used as the hole transport layer material.
- Comparative Example 3 An organic EL device was produced in the same manner as in Example 11 except that NPB was used as the hole transport layer material.
- the material for a phosphorescent light emitting device of the present invention has a high ability to inject and transport both charges, and the use of this for an organic EL device reduces the driving voltage of the device. Furthermore, when this phosphorescent light emitting element material is included in the light emitting layer, the charge balance is improved, so that the recombination probability is improved. In addition, the phosphorescent device material has the lowest excited triplet state energy high enough to confine the lowest excited triplet state energy of the dopant, so that the triplet excitation energy from the dopant to the host molecule can be reduced. The movement can be effectively suppressed. From the above points, high luminous efficiency was achieved. In addition, since the phosphorescent light emitting element material has good amorphous characteristics and high thermal stability and is electrochemically stable, it has realized a long-life organic EL element having a long driving life.
- the organic EL device according to the present invention has practically satisfactory levels in terms of light emission characteristics, driving life and durability, flat panel display (mobile phone display device, in-vehicle display device, OA computer display device, television, etc.), surface light emission, etc. Its technical value is great in applications to light sources (lighting, light sources for copying machines, backlight light sources for liquid crystal displays and instruments), display boards, and sign lamps that make use of the characteristics of the body.
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Abstract
Description
式(1a)中、Xは独立にメチン又は窒素を表し、3つのXを含む環においてXの少なくとも1つは窒素である。式(1b)中、Yは直接結合、―NA4―、―O―又は―S―のいずれかを表す。式(1a)及び(1b)中、A2、A3及びA4はそれぞれ独立しては炭素数6~38の芳香族炭化水素基、炭素数3~37の芳香族複素環基、炭素数1~10のアルキル基又は炭素数3~11のシクロアルキル基を表す。
本発明の有機EL素子は、基板に支持されていることが好ましい。この基板については、特に制限はなく、従来から有機EL素子に慣用されているものであればよく、例えば、ガラス、透明プラスチック、石英などからなるものを用いることができる。
有機EL素子における陽極としては、仕事関数の大きい(4eV以上)金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。このような電極物質の具体例としてはAu等の金属、CuI、インジウムチンオキシド(ITO)、SnO2、ZnO等の導電性透明材料が挙げられる。また、IDIXO(In2O3-ZnO)等非晶質で透明導電膜を作製可能な材料を用いてもよい。陽極はこれらの電極物質を蒸着やスパッタリング等の方法により、薄膜を形成させ、フォトリソグラフィー法で所望の形状のパターンを形成してもよく、あるいはパターン精度をあまり必要としない場合は(100μm以上程度)、上記電極物質の蒸着やスパッタリング時に所望の形状のマスクを介してパターンを形成してもよい。あるいは、有機導電性化合物のように塗布可能な物質を用いる場合には、印刷方式、コーティング方式等湿式成膜法を用いることもできる。この陽極より発光を取り出す場合には、透過率を10%より大きくすることが望ましく、また陽極としてのシート抵抗は数百Ω/□以下が好ましい。更に膜厚は材料にもよるが、通常10~1000nm、好ましくは10~200nmの範囲で選ばれる。
一方、陰極としては、仕事関数の小さい(4eV以下)金属(電子注入性金属と称する)、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが用いられる。このような電極物質の具体例としては、ナトリウム、ナトリウム-カリウム合金、マグネシウム、リチウム、マグネシウム/銅混合物、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、アルミニウム/酸化アルミニウム(Al2O3)混合物、インジウム、リチウム/アルミニウム混合物、希土類金属等が挙げられる。これらの中で、電子注入性及び酸化等に対する耐久性の点から、電子注入性金属とこれより仕事関数の値が大きく安定な金属である第二金属との混合物、例えば、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、アルミニウム/酸化アルミニウム(Al2O3)混合物、リチウム/アルミニウム混合物、アルミニウム等が好適である。陰極はこれらの電極物質を蒸着やスパッタリング等の方法により薄膜を形成させることにより、作製することができる。また、陰極としてのシート抵抗は数百Ω/□以下が好ましく、膜厚は通常10nm~5μm、好ましくは50~200nmの範囲で選ばれる。なお、発光した光を透過させるため、有機EL素子の陽極又は陰極のいずれか一方が、透明又は半透明であれば発光輝度が向上し好都合である。
発光層は燐光発光層であり、燐光発光ドーパントとホスト材料を含む。燐光発光ドーパント材料としては、ルテニウム、ロジウム、パラジウム、銀、レニウム、オスミウム、イリジウム、白金及び金から選ばれる少なくとも一つの金属を含む有機金属錯体を含有するものがよい。かかる有機金属錯体は、前記先行技術文献等で公知であり、これらが選択されて使用可能である。
注入層とは、駆動電圧低下や発光輝度向上のために電極と有機層間に設けられる層のことで、正孔注入層と電子注入層があり、陽極と発光層又は正孔輸送層の間、及び陰極と発光層又は電子輸送層との間に存在させてもよい。注入層は必要に応じて設けることができる。
正孔阻止層とは広い意味では電子輸送層の機能を有し、電子を輸送する機能を有しつつ正孔を輸送する能力が著しく小さい正孔阻止材料からなり、電子を輸送しつつ正孔を阻止することで電子と正孔の再結合確率を向上させることができる。
電子阻止層とは、正孔を輸送する機能を有しつつ電子を輸送する能力が著しく小さい材料から成り、正孔を輸送しつつ電子を阻止することで電子と正孔が再結合する確率を向上させることができる。
励起子阻止層とは、発光層内で正孔と電子が再結合することにより生じた励起子が電荷輸送層に拡散することを阻止するための層であり、本層の挿入により励起子を効率的に発光層内に閉じ込めることが可能となり、素子の発光効率を向上させることができる。励起子阻止層は発光層に隣接して陽極側、陰極側のいずれにも挿入することができ、両方同時に挿入することも可能である。
正孔輸送層とは正孔を輸送する機能を有する正孔輸送材料からなり、正孔輸送層は単層又は複数層設けることができる。
電子輸送層とは電子を輸送する機能を有する材料からなり、電子輸送層は単層又は複数層設けることができる。
化合物34の合成
APCI-TOFMS, m/z 614 [M+H]+、1H -NMR測定結果(測定溶媒:THF-d8)を図2に示す。
化合物36の合成
膜厚150nmのITOからなる陽極が形成されたガラス基板上に、各薄膜を真空蒸着法にて、真空度4.0×10-4 Paで積層させた。まず、ITO上に正孔注入層として銅フタロシアニン(CuPc)を25nmの厚さに形成した。次に、正孔注入層上に、正孔輸送層として4,4'-ビス[N-(1-ナフチル)-N-フェニルアミノ]ビフェニル(NPB)を55nmの厚さに形成した。次に、正孔輸送層上に、発光層のホスト成分としての化合物34とゲスト成分としてのビス(2-(2'-ベンゾ[4,5-a]チエニル)ピリジナト-N,C3)イリジウム(アセチルアセトネート)〔(Btp)2Iracac〕とを異なる蒸着源から、共蒸着し、47.5nmの厚さに形成した。この時、(Btp)2Iracacの濃度は8.0 wt%であった。次に、電子輸送層としてトリス(8-ヒドロキシキノリナト)アルミニウム(III)(Alq3)を30nmの厚さに形成した。更に、電子輸送層上に、電子注入層としてフッ化リチウム(LiF)を1nmの厚さに形成した。最後に、電子注入層上に、電極としてアルミニウム(Al)を200nmの厚さに形成し、有機EL素子を作成した。
発光層のホスト成分として、化合物33を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、化合物36を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、化合物71を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、化合物72を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、化合物22を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、化合物49を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、化合物87を用いた以外は実施例3と同様にして有機EL素子を作成した。
発光層のホスト成分として、ビス(2-メチル-8-キノリノラト)-4-フェニルフェノラトアルミニウム(III)(BAlq)を用いた以外は実施例3と同様にして有機EL素子を作成した。
膜厚150nmのITOからなる陽極が形成されたガラス基板上に、各薄膜を真空蒸着法にて、真空度4.0×10-4 Paで積層させた。まず、ITO上に正孔注入層としてCuPcを25nmの厚さに形成し、次に正孔輸送層として化合物77を30nmの厚さに形成した。次に、正孔輸送層上に、発光層として2,6-ジ(4-カルバゾリルフェニル)ピリジンとIr(PPy)3とを異なる蒸着源から、共蒸着し、40nmの厚さに形成した。この時、Ir(PPy)3の濃度は6.0wt%であった。次に、電子輸送層としてAlq3を20nmの厚さに形成した。更に、電子輸送層上に、電子注入層としてフッ化リチウム(LiF)を0.5nmの厚さに形成した。最後に、電子注入層上に、電極としてアルミニウム(Al)を170nmの厚さに形成し、有機EL素子を作成した。
正孔輸送層材料として、化合物78を用いた以外は実施例11と同様にして有機EL素子を作成した。
正孔輸送層材料として、化合物81を用いた以外は実施例11と同様にして有機EL素子を作成した。
正孔輸送層材料として、NPBを用いた以外は実施例11と同様にして有機EL素子を作成した。
Claims (7)
- 一般式(1)で表されるインドロカルバゾール化合物からなる燐光発光素子用材料。
一般式(1)中、A1はそれぞれ独立して炭素数6~50の芳香族炭化水素基、炭素数3~50の芳香族複素環基、炭素数1~10のアルキル基又は炭素数3~11のシクロアルキル基を表すが、少なくとも1つは式(1a)又は式(1b)で示される芳香族複素環基であり、かつ少なくとも1つは縮環構造を有する基である。R1はそれぞれ独立して水素、炭素数1~10のアルキル基、炭素数1~6のアルコキシ基又は炭素数2~6のアシル基を表す。
式(1a)中、Xは独立にメチン又は窒素を表し、3つのXを含む環においてXの少なくとも1つは窒素である。式(1b)中、Yは直接結合、―NA4―、―O―又は―S―のいずれかを表す。式(1a)及び(1b)中、A2、A3及びA4はそれぞれ独立しては炭素数6~38の芳香族炭化水素基、炭素数3~37の芳香族複素環基、炭素数1~10のアルキル基又は炭素数3~11のシクロアルキル基を表す。 - 一般式(1)において、A1の少なくとも1つが式(1a)で示される芳香族複素環基である請求項1に記載の燐光発光素子用材料。
- 一般式(1)において、A1の1つ又は2つが式(1b)で示される芳香族複素環基であり、且つ式(1a)で示される芳香族複素環基ではないことを特徴とする請求項1に記載の燐光発光素子用材料。
- 基板上に、陽極、複数の有機層及び陰極が積層されてなる有機電界発光素子において、請求項1~3のいずれかに記載の燐光発光素子用材料を含む有機層を有することを特徴とする有機電界発光素子。
- 燐光発光素子用材料を含む有機層が、発光層、正孔輸送層、電子輸送層及び正孔阻止層からなる群れから選ばれる少なくとも一つの層である請求項4に記載の有機電界発光素子。
- 燐光発光素子用材料を含む有機層が、燐光発光ドーパントを含有する発光層であることを特徴とする請求項5に記載の有機電界発光素子。
- 燐光発光素子用材料を含む有機層が、正孔輸送層であることを特徴とする請求項5に記載の有機電界発光素子。
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Publication number | Publication date |
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EP2416397A1 (en) | 2012-02-08 |
CN102318101A (zh) | 2012-01-11 |
JP4870245B2 (ja) | 2012-02-08 |
JPWO2010113755A1 (ja) | 2012-10-11 |
CN102318101B (zh) | 2013-05-29 |
EP2416397A4 (en) | 2012-08-29 |
TW201105772A (en) | 2011-02-16 |
EP2416397B1 (en) | 2014-08-20 |
US8962158B2 (en) | 2015-02-24 |
US20120001165A1 (en) | 2012-01-05 |
TWI471406B (zh) | 2015-02-01 |
KR20120005005A (ko) | 2012-01-13 |
KR101129834B1 (ko) | 2012-03-26 |
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