WO2010113726A1 - 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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- WO2010113726A1 WO2010113726A1 PCT/JP2010/055115 JP2010055115W WO2010113726A1 WO 2010113726 A1 WO2010113726 A1 WO 2010113726A1 JP 2010055115 W JP2010055115 W JP 2010055115W WO 2010113726 A1 WO2010113726 A1 WO 2010113726A1
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- 239000000463 material Substances 0.000 title claims abstract description 85
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 27
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims abstract description 27
- 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 abstract description 22
- 229910052757 nitrogen Chemical group 0.000 claims abstract description 21
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims abstract description 18
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 15
- 125000000753 cycloalkyl group Chemical group 0.000 claims abstract description 14
- 239000001257 hydrogen Substances 0.000 claims abstract description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000002019 doping agent Substances 0.000 claims abstract description 12
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 claims abstract description 8
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 133
- 125000004432 carbon atom Chemical group C* 0.000 claims description 48
- 239000012044 organic layer Substances 0.000 claims description 29
- 125000003118 aryl group Chemical group 0.000 claims description 24
- 230000000903 blocking effect Effects 0.000 claims description 22
- 230000005525 hole transport Effects 0.000 claims description 21
- 125000000623 heterocyclic group Chemical group 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 abstract description 46
- 238000002347 injection Methods 0.000 description 23
- 239000007924 injection Substances 0.000 description 23
- VVVPGLRKXQSQSZ-UHFFFAOYSA-N indolo[3,2-c]carbazole Chemical class C1=CC=CC2=NC3=C4C5=CC=CC=C5N=C4C=CC3=C21 VVVPGLRKXQSQSZ-UHFFFAOYSA-N 0.000 description 22
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 21
- -1 carbazole compound Chemical class 0.000 description 19
- 239000000203 mixture Substances 0.000 description 19
- 239000013078 crystal Substances 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 16
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 15
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 15
- 239000000243 solution Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000012153 distilled water Substances 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 125000001424 substituent group Chemical group 0.000 description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 12
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 12
- 239000002904 solvent Substances 0.000 description 12
- 238000003786 synthesis reaction Methods 0.000 description 12
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 11
- 238000001914 filtration Methods 0.000 description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 9
- 235000019341 magnesium sulphate Nutrition 0.000 description 9
- 239000012299 nitrogen atmosphere Substances 0.000 description 9
- 238000005160 1H NMR spectroscopy Methods 0.000 description 8
- UJOBWOGCFQCDNV-UHFFFAOYSA-N Carbazole Natural products C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 8
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 8
- 150000001491 aromatic compounds Chemical class 0.000 description 8
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- 239000011777 magnesium Substances 0.000 description 8
- 229910052749 magnesium Inorganic materials 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000007772 electrode material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000010409 thin film Substances 0.000 description 7
- 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 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 6
- 229910000027 potassium carbonate Inorganic materials 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000004440 column chromatography Methods 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment 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
- ZXAQFYZQHPGMMN-BZSJEYESSA-N (3R)-3-[4-(aminomethyl)-6-(trifluoromethyl)pyridin-2-yl]oxy-N-phenylcyclohexane-1-carboxamide Chemical compound C1C[C@H](CC(C1)C(=O)NC2=CC=CC=C2)OC3=CC(=CC(=N3)C(F)(F)F)CN ZXAQFYZQHPGMMN-BZSJEYESSA-N 0.000 description 4
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 4
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 4
- 125000003545 alkoxy group Chemical group 0.000 description 4
- 150000004945 aromatic hydrocarbons Chemical group 0.000 description 4
- WDECIBYCCFPHNR-UHFFFAOYSA-N chrysene Chemical compound C1=CC=CC2=CC=C3C4=CC=CC=C4C=CC3=C21 WDECIBYCCFPHNR-UHFFFAOYSA-N 0.000 description 4
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 4
- 238000000295 emission spectrum Methods 0.000 description 4
- 239000000706 filtrate Substances 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
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- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 4
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- 230000006798 recombination Effects 0.000 description 4
- 238000005215 recombination Methods 0.000 description 4
- 238000001269 time-of-flight mass spectrometry Methods 0.000 description 4
- NSNKTSSANPWFJA-UHFFFAOYSA-N 11,12-dihydroindolo[2,3-a]carbazole Chemical compound C12=CC=CC=C2NC2=C1C=CC1=C2NC2=CC=CC=C12 NSNKTSSANPWFJA-UHFFFAOYSA-N 0.000 description 3
- XIYPPJVLAAXYAB-UHFFFAOYSA-N 2-bromo-6-phenylpyridine Chemical compound BrC1=CC=CC(C=2C=CC=CC=2)=N1 XIYPPJVLAAXYAB-UHFFFAOYSA-N 0.000 description 3
- QQWXDAWSMPLECU-UHFFFAOYSA-N 5,12-dihydroindolo[3,2-c]carbazole Chemical compound C1=CC=C2NC3=C4C5=CC=CC=C5NC4=CC=C3C2=C1 QQWXDAWSMPLECU-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
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- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 3
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- SHMGVQVSZPVFOT-UHFFFAOYSA-N n-(5-cyclohexyl-2-methoxyphenyl)-4-methyl-3-(3-quinolin-4-ylpyridin-2-yl)oxybenzamide Chemical compound C1=C(NC(=O)C=2C=C(OC=3C(=CC=CN=3)C=3C4=CC=CC=C4N=CC=3)C(C)=CC=2)C(OC)=CC=C1C1CCCCC1 SHMGVQVSZPVFOT-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
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910000510 noble metal Inorganic materials 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
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 229950000688 phenothiazine Drugs 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
- JOVOSQBPPZZESK-UHFFFAOYSA-N phenylhydrazine hydrochloride Chemical compound Cl.NNC1=CC=CC=C1 JOVOSQBPPZZESK-UHFFFAOYSA-N 0.000 description 1
- 229940038531 phenylhydrazine hydrochloride Drugs 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- SIOXPEMLGUPBBT-UHFFFAOYSA-M picolinate Chemical compound [O-]C(=O)C1=CC=CC=N1 SIOXPEMLGUPBBT-UHFFFAOYSA-M 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
- 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
- 125000005493 quinolyl group Chemical group 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
- 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
- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-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
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 238000001308 synthesis method Methods 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
- 238000002834 transmittance Methods 0.000 description 1
- 229910000404 tripotassium phosphate Inorganic materials 0.000 description 1
- 235000019798 tripotassium phosphate Nutrition 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 electroluminescence element (hereinafter referred to as an organic EL element) has a light emitting layer and a pair of counter electrodes sandwiching the layer as its 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 the following indolocarbazole compounds are disclosed as hole transport materials.
- Patent Document 4 discloses the following indolocarbazole compounds 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 following general formula (1).
- ring A represents an aromatic ring represented by formula (1a) fused with an adjacent ring
- ring B represents a heterocyclic ring represented by formula (1b) fused with an adjacent ring
- X represents methine or nitrogen
- A represents an aromatic hydrocarbon group having 6 to 38 carbon atoms, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 11 carbon atoms, or a group represented by the formula (1c).
- Y represents methine or nitrogen, but at least one is nitrogen.
- n represents 0 or 1.
- Ar each independently represents an aromatic hydrocarbon group having 6 to 30 carbon atoms or an aromatic heterocyclic group having 3 to 30 carbon atoms.
- each R independently represents hydrogen, an alkyl group having 1 to 10 carbon atoms or a cycloalkyl group having 3 to 11 carbon atoms.
- an indolocarbazole derivative represented by the following general formula (2) is a preferred compound.
- A is an aromatic hydrocarbon group having 6 to 38 carbon atoms or an aromatic heterocyclic group represented by the formula (2c).
- A is an indolo which is an aromatic hydrocarbon group having 6 to 38 carbon atoms or an aromatic heterocyclic group represented by the formula (2c) which is not a condensed ring structure.
- a carbazole compound is mentioned as a preferred compound.
- an indolocarbazole compound in which Ar is an aromatic hydrocarbon group or an aromatic heterocyclic group that is not a condensed ring structure is a more preferable compound.
- indolocarbazole compounds represented by general formula (1) or general formula (2) indolocarbazole compounds represented by the following general formulas (3) to (6) are more preferred compounds.
- the present invention relates to an organic electroluminescent device in which an anode, an organic layer, and a cathode are laminated on a substrate, and the organic electroluminescent device has an organic layer containing the above phosphorescent device material.
- FIG. 1 shows a 1 H-NMR chart of Compound 1-19 of the present invention.
- 1 shows a 1 H-NMR chart of Compound 1-43 of the present invention.
- 1 shows a 1 H-NMR chart of Compound 3-11 of the present invention.
- 1 shows a 1 H-NMR chart of Compound 3-18 of the present invention.
- the phosphorescent light emitting device material of the present invention is an indolocarbazole compound represented by the general formula (1). It is considered that an excellent effect is brought about by having a structure in which one nitrogen of this indolocarbazole compound is substituted with pyridine and pyridine is further substituted with one aromatic hydrocarbon or aromatic heterocyclic ring.
- ring A is represented by the formula (1a) fused with the adjacent ring
- ring B is a heterocyclic ring represented by the formula (1b) fused with the adjacent ring.
- the general formula (1) or (2) includes the formulas (1a), (1b), and (1c) or (2c), when the general formula (1) or (2) is referred to, May be used to mean including formula.
- the description related to the general formula (1) is mostly the same as the description related to the general formula (2), it is understood that the common part is also the description related to the general formula (2).
- the aromatic ring represented by the formula (1a) can be condensed with two adjacent rings at an arbitrary position, but there is a position where the aromatic ring cannot be structurally condensed.
- the aromatic ring represented by the formula (1a) has six sides, but does not condense with two adjacent rings at two adjacent sides.
- the heterocyclic ring represented by the formula (1b) can be condensed with two adjacent rings at any position, but there is a position where it cannot be condensed structurally.
- the heterocyclic ring represented by the formula (1b) has five sides, but does not condense with two adjacent rings at two adjacent sides, and also condenses with an adjacent ring at a side including a nitrogen atom. None do. Therefore, the types of indolocarbazole skeleton are limited.
- the indolocarbazole skeleton is preferably represented by the following form. From this example, the preferred condensation positions of the aromatic hydrocarbon ring and the heterocyclic ring in the indolocarbazole skeleton are understood.
- X represents methine or nitrogen, preferably methine.
- A represents an aromatic hydrocarbon group having 6 to 38 carbon atoms, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 11 carbon atoms, or formula (1c ) Represents a group represented by An aromatic hydrocarbon group having 6 to 18 carbon atoms, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, or a group represented by the formula (1c) is preferable.
- aromatic hydrocarbon group examples include benzene, naphthalene, fluorene, phenalene, anthracene, phenanthrene, fluoranthene, pyrene, chrysene, tetraphen, tetracene, naphthacene, rubrene, picene, perylene, pentaphen, pentaphen or aromatic rings.
- monovalent groups generated by removing hydrogen from the linked aromatic compound Preferably, monovalent groups generated by removing hydrogen from an aromatic compound in which a plurality of aromatic rings are connected include naphthalene, fluorene, phenalene, anthracene, phenanthrene, fluoranthene.
- a plurality of linked aromatic hydrocarbon groups may be formed together with pyridine, pyrimidine, triazine, quinoline, isoquinoline, carbazole and the like.
- the aromatic hydrocarbon group may have a substituent.
- preferred substituents include an alkyl group having 1 to 4 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, and 1 carbon atom. Or an alkoxy group having 2 to 2 atoms, an acetyl group, or a diarylamino group having 6 to 12 carbon atoms.
- 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 is, for example, a case where Ar 1 is an aromatic hydrocarbon in formulas (11) to (13), and an aromatic heterocyclic group Means that Ar 1 is an aromatic heterocycle.
- “not having a condensed ring structure” means that Ar 1 is not a condensed ring structure.
- Ar 2 to Ar 6 may be the same or different.
- aromatic hydrocarbon group generated by removing hydrogen from an aromatic compound in which a plurality of aromatic rings are connected include biphenyl, terphenyl, phenylnaphthalene, phenylanthracene, bistriazylbenzene, phenylpyridine, diphenylpyridine, Examples thereof include monovalent groups derived from diphenylpyrimidine, diphenyltriazine, phenylcarbazole and the like, and the connecting position of indolocarbazole with nitrogen is not limited, and it may be a terminal ring or a central ring. However, the ring bonded to nitrogen is preferably not a condensed ring structure.
- the aromatic ring is a group derived from an aromatic compound in which a plurality of aromatic rings are connected, the number connected is preferably 2 to 5, more preferably 2 or 3.
- the aromatic hydrocarbon group or aromatic heterocyclic group may have a substituent, and when it has a substituent, preferred substituents include an alkyl group having 1 to 4 carbon atoms and a group having 3 to 6 carbon atoms.
- the carbon number in the case of having a substituent is calculated including the carbon number of the substituent.
- A is an alkyl group having 1 to 10 carbon atoms and a cycloalkyl group having 3 to 11 carbon atoms include methane, ethane, t-butane, n-octane, and cyclohexane. And monovalent groups generated by removing hydrogen.
- the alkyl group or cycloalkyl group may have a substituent, and when it has a substituent, preferred substituents include an alkoxy group having 1 to 2 carbon atoms, an acetyl group, and an aryl group having 6 to 12 carbon atoms. And a heteroaryl group having 3 to 12 carbon atoms. More preferred are a phenyl group, a naphthyl group, a carbazolyl group, a quinolyl group, and an isoquinolyl group.
- A is an aromatic hydrocarbon group having 6 to 38 carbon atoms or a preferred embodiment represented by the formula (1c), and is an aromatic hydrocarbon having 6 to 38 carbon atoms that is not a condensed ring structure. It is mentioned as a more preferable form that it represents with group or Formula (1c).
- Y represents methine or nitrogen, but at least one is nitrogen. Preferably, one Y is nitrogen.
- n 0 or 1.
- n is 1.
- An aromatic heterocyclic group represented by the formula (2c), which is a structure in which the formula (1c) is limited, may be mentioned as a preferred form.
- Ar represents an aromatic hydrocarbon group having 6 to 30 carbon atoms or an aromatic heterocyclic group having 3 to 30 carbon atoms.
- Ar is a monovalent aromatic hydrocarbon group having 6 to 18 carbon atoms or an aromatic heterocyclic group having 3 to 17 carbon atoms.
- preferable Ar examples include benzene, naphthalene, fluorene, anthracene, phenanthrene, fluoranthene, pyrene, chrysene, pyridine, pyrimidine, triazine, indole, quinoline, isoquinoline, quinoxaline, naphthyridine, carbazole, phenanthridine, phenanthroline, acridine, phenazine. , Phenoxazine, phenothiazine, anti-lysine, or a monovalent group generated by removing hydrogen from an aromatic compound in which a plurality of these aromatic rings are linked.
- Ar preferably does not form a condensed ring structure, and specific examples include benzene, pyridine, pyrimidine, triazine, or a monovalent group generated by removing hydrogen from an aromatic compound in which a plurality of these aromatic rings are connected. When a plurality of the aromatic rings are connected, they may be the same or different.
- groups generated by removing hydrogen from an aromatic compound in which a plurality of aromatic rings are connected include, for example, biphenyl, terphenyl, bipyridine, bipyrimidine, vitriazine, bistriazylbenzene, phenylpyridine, diphenylpyridine, diphenylpyrimidine, diphenyl Examples include monovalent groups derived from triazine, phenylcarbazole, pyridylcarbazole, etc.
- the position of connection with the pyridine ring is not limited, and it may be a terminal ring or a central ring.
- the ring bonded to is preferably not a condensed ring structure.
- the aromatic ring is a group derived from an aromatic compound in which a plurality of aromatic rings are connected, the number connected is preferably 2 to 5, more preferably 2 or 3.
- the aromatic hydrocarbon group and the aromatic heterocyclic group may have a substituent.
- preferred substituents include an alkyl group having 1 to 4 carbon atoms and an alkoxy group having 1 to 2 carbon atoms. Group, an acetyl group.
- each R independently represents hydrogen, an alkyl group having 1 to 10 carbon atoms, or a cycloalkyl group having 3 to 11 carbon atoms. Preferred are hydrogen, an alkyl group having 1 to 4 carbon atoms, and a cycloalkyl group having 3 to 6 carbon atoms. More preferably, it is hydrogen.
- the indolocarbazole compounds represented by the above general formula (2) can be cited as preferred compounds, and represented by the general formulas (3) to (6).
- An indolocarbazole compound is mentioned as a more preferable compound.
- Indolocarbazole compounds represented by the general formulas (1) to (6) can be synthesized by selecting a raw material according to the structure of the target compound and using a known method.
- the indolocarbazole skeleton of the indolocarbazole compound represented by the general formula (3) is Synlett, 2005, No. 1; 1, p42-48 can be synthesized according to the following reaction formula with reference to the synthesis example.
- indolocarbazole skeleton represented by the general formula (4) has the following reaction formula with reference to the synthesis example shown in Archiv der Pharmazie (Weinheim, Germany), 1987, 320 (3), p280-2. Can be synthesized.
- the compounds of the present invention represented by the general formulas (1) to (6) are obtained by substituting the hydrogen on the nitrogen of each indolocarbazole skeleton obtained by the above reaction formula with a corresponding aromatic group according to a conventional method. Can be synthesized.
- indolocarbazole compound represented by the general formula (1) Specific examples of the indolocarbazole compound represented by the general formula (1) are shown below, but the phosphorescent light emitting device material of the present invention is not limited thereto.
- the phosphorescent light emitting device material of the present invention provides an excellent organic electroluminescent device by being contained in at least one organic layer of an organic EL device in which an anode, a plurality of organic layers and a cathode are laminated on a substrate.
- an organic layer to be contained a light emitting layer, a hole transport layer, an electron transport layer or a hole blocking layer is suitable. More preferably, it may be contained as a host material of a light emitting layer containing a phosphorescent dopant.
- the organic EL device of the present invention has an organic layer having at least one light emitting layer between an anode and a cathode laminated on a substrate, and at least one organic layer is a material for a phosphorescent light emitting device of the present invention. including.
- the phosphorescent light emitting device material of the present invention is included 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 showing a structural example of a general organic EL device 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, and 5 is 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.
- electrode materials include metals such as Au, and conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2 and ZnO.
- conductive transparent materials such as CuI, indium tin oxide (ITO), SnO 2 and ZnO.
- an amorphous material such as IDIXO (In 2 O 3 —ZnO) that can form 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
- Suitable are a magnesium / aluminum mixture, a magnesium / indium mixture, an aluminum / aluminum oxide (Al 2 O 3 ) mixture, a lithium / aluminum mixture, aluminum and the like.
- 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.
- Preferred 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 in the range of 5 to 30% by weight.
- the host material in the light emitting layer it is preferable to use the 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.
- a known host compound that can be used is preferably a compound that has a hole transporting ability and an electron transporting ability, prevents a long wavelength of light emission, 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,
- metal complexes typified by metal complexes of Russianine derivatives, 8-quinolinol derivatives, metal phthalocyanines, metal complexes of benzoxazole and benzothiazole derivatives, polysilane compounds, poly (N-vinylcarbazole) derivatives, aniline copolymers, Examples thereof include polymer compounds such
- 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 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 material 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), it is sufficient if it has a function of transmitting electrons injected from the cathode to the light emitting layer.
- any one of conventionally known compounds can be selected and used. For example, nitro-substituted fluorene Derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, and the like.
- 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.
- the obtained residue was dissolved in 300 ml of dichloromethane, 100 ml of distilled water was added, the organic layer and the aqueous layer were fractionated, and the organic layer was washed with distilled water (2 x 200 ml).
- the organic layer was dehydrated with magnesium sulfate, the magnesium sulfate was filtered off, and the solvent was distilled off under reduced pressure.
- the obtained yellow crystals were dried under reduced pressure and then purified by column chromatography to obtain a white powder. Purification by recrystallization gave 17.0 g (0.053 mol, yield 31%) of intermediate C as a white powder.
- compounds 1-1, 2-1, 3-1 and 3-22 were synthesized in accordance with the synthesis examples and the synthesis methods described in the specification, and used for the production of organic EL devices.
- Example 5 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 to a thickness of 20 nm on ITO.
- NPB 4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl
- Exemplified Compound 1-1 as a host material of the light emitting layer and Tris (2-phenylpyridine) iridium (III) (Ir (ppy) 3 ) as a guest material from different vapor deposition sources.
- the light emitting layer was formed by co-evaporation to a thickness of 35 nm. At this time, the concentration of Ir (ppy) 3 was 7.0 wt%.
- tris (8-hydroxyquinolinato) aluminum (III) (Alq3) was formed to a thickness of 40 nm as an electron transport layer.
- lithium fluoride (LiF) was formed to a thickness of 0.5 nm as an electron injection layer on the electron transport layer.
- aluminum (Al) was formed as an electrode to a thickness of 170 nm, and an organic EL element was produced.
- 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 517 nm, indicating that light emission from Ir (ppy) 3 was obtained.
- Example 6 An organic EL device was produced in the same manner as in Example 5 except that Compound 1-19 was used as the host material for the light emitting layer.
- Example 7 An organic EL device was produced in the same manner as in Example 5 except that Compound 1-43 was used as the host material for the light emitting layer.
- Example 8 An organic EL device was produced in the same manner as in Example 5 except that Compound 2-1 was used as the host material for the light emitting layer.
- Example 9 An organic EL device was produced in the same manner as in Example 5 except that Compound 3-1 was used as the host material for the light emitting layer.
- Example 10 An organic EL device was produced in the same manner as in Example 5 except that Compound 3-11 was used as the host material for the light emitting layer.
- Example 11 An organic EL device was produced in the same manner as in Example 5 except that Compound 3-18 was used as the host material for the light emitting layer.
- Example 12 An organic EL device was produced in the same manner as in Example 5 except that Compound 3-22 was used as the host material for the light emitting layer.
- Comparative Example 1 An organic EL device was produced in the same manner as in Example 1 except that CBP was used as the host material of the light emitting layer.
- Comparative Example 2 An organic EL device was produced in the same manner as in Example 5 except that the following compound H-1 was used as the host material for the light emitting layer.
- the maximum wavelengths of the device emission spectra of the organic EL devices obtained in Examples 5 to 12 and Comparative Examples 1 and 2 were all 517 nm, indicating that light emission from Ir (ppy) 3 was obtained.
- the emission characteristics are shown in Table 1.
- Example 13 Each thin film was laminated at a vacuum degree of 2.0 ⁇ 10 ⁇ 5 Pa by a vacuum deposition method on a glass substrate on which an anode made of indium tin oxide (ITO) having a thickness of 110 nm was formed.
- ITO indium tin oxide
- CuPC copper phthalocyanine
- N, N-di (naphthalen-1-yl) -N, N-diphenyl-benzidene (NPB) was formed to a thickness of 90 nm as a hole transport layer.
- compound 3-1 as a host material of the light emitting layer and an iridium complex [iridium (III) bis (4,6-di-fluorophenyl) -pyridinate as a blue phosphorescent material as a dopant -N, C2 ′] picolinate] (FIrpic) were co-deposited from different deposition sources to form a light emitting layer with a thickness of 30 nm. The concentration of FIrpic was 10%.
- Alq3 was formed to a thickness of 30 nm as an electron transport layer.
- lithium fluoride (LiF) was formed to a thickness of 1.0 nm as an electron injection layer.
- the obtained organic EL device has a layer structure in which an electron injection layer is added between the cathode and the electron transport layer in the organic EL device shown in FIG.
- the organic EL element had the light emission characteristics as shown in Table 2.
- Table 2 the luminance, voltage, and luminous efficiency show values at 2.5 mA / cm 2 .
- the maximum wavelength of the device emission spectrum was 475 nm, indicating that light emission from FIrpic was obtained.
- Example 14 An organic EL device was produced in the same manner as in Example 13 except that Compound 3-11 was used as the host material for the light emitting layer.
- Example 15 An organic EL device was produced in the same manner as in Example 13 except that Compound 3-18 was used as the host material for the light emitting layer.
- Example 16 An organic EL device was produced in the same manner as in Example 13 except that Compound 3-22 was used as the host material for the light emitting layer.
- Comparative Example 3 An organic EL device was prepared in the same manner as in Example 13 except that CBP was used as the host material for the light emitting layer.
- Comparative Example 4 An organic EL device was produced in the same manner as in Example 13 except that H-1 was used as the host material for the light emitting layer.
- the phosphorescent light emitting device material of the present invention is characterized in that pyridine is substituted on nitrogen of the indolocarbazole skeleton, and further an aromatic ring is substituted.
- substitution of an indolocarbazole skeleton and an aromatic ring at the 2,6-positions of pyridine is considered to improve molecular stability.
- the phosphorescent light emitting device material is considered to exhibit good charge injection and transport properties and high durability.
- the organic EL element using this has a low driving voltage of the element. In particular, 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 considered to be improved. .
- 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. It is considered that 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)において、Xはメチン又は窒素を表す。式(1b)において、Aは炭素数6~38の芳香族炭化水素基、炭素数1~10のアルキル基、炭素数3~11のシクロアルキル基又は式(1c)で示される基を表す。式(1c)において、Yはメチン又は窒素を表すが、少なくとも1つは窒素である。nは0又は1を表す。式(1)及び(1c)において、Arはそれぞれ独立して炭素数6~30の芳香族炭化水素基、炭素数3~30の芳香族複素環基を表す。式(1)、(1a)及び(1c)において、Rはそれぞれ独立して水素、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。
APCI-TOFMS, m/z 486 [M+H]+ 、1H-NMR測定結果(測定溶媒:THF-d8)を図2に示す。
APCI-TOFMS, m/z 741 [M+H]+ 、1H-NMR測定結果(測定溶媒:THF-d8)を図3に示す。
APCI-TOFMS, m/z 486 [M+H]+ 、1H-NMR測定結果(測定溶媒:CD2Cl2)を図4に示す。
APCI-TOFMS, m/z 575 [M+H]+、1H-NMR測定結果(測定溶媒:CD2Cl2)を図5に示す。
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上に銅フタロシアニン(CuPC) を 20 nm の厚さに形成した。次に、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40nmの厚さに形成した。次に、正孔輸送層上に、発光層のホスト材料として例示化合物1-1と、ゲスト材料としてトリス(2-フェニルピリジン)イリジウム(III)(Ir(ppy)3)とを異なる蒸着源から、共蒸着し、35nmの厚さに発光層を形成した。この時、Ir(ppy)3の濃度は7.0 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40nm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。
発光層のホスト材料として、化合物1-19を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物1-43を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物2-1を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物3-1を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物3-11を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物3-18を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物3-22を用いた以外は実施例5と同様にして有機EL素子を作成した。
発光層のホスト材料として、CBPを用いた以外は実施例1と同様にして有機EL素子を作成した。
膜厚 110 nm の 酸化インジウムスズ(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 2.0×10-5 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 25 nm の厚さに形成した。次に、正孔輸送層としてN,N-ジ(ナフタレン-1-イル)-N,N-ジフェニル-ベンジデン(NPB)を 90 nm の厚さに形成した。次に、正孔輸送層上に、発光層のホスト材料としての化合物3-1とドーパントとしての青色燐光材料であるイリジウム錯体[イリジウム(III)ビス(4,6-ジ-フルオロフェニル)-ピリジネート-N,C2’]ピコリネート](FIrpic)とを異なる蒸着源から、共蒸着し、30 nm の厚さに発光層を形成した。FIrpicの濃度は 10 %であった。次に、電子輸送層として Alq3 を 30 nm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 1.0 nm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70 nm厚さに形成した。得られた有機EL素子は、図1に示す有機EL素子において、陰極と電子輸送層の間に、電子注入層が追加された層構成を有する。
発光層のホスト材料として、化合物3-11を用いた以外は実施例13と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物3-18を用いた以外は実施例13と同様にして有機EL素子を作成した。
発光層のホスト材料として、化合物3-22を用いた以外は実施例13と同様にして有機EL素子を作成した。
発光層のホスト材料として、CBPを用いた以外は実施例13と同様にして有機EL素子を作成した。
発光層のホスト材料として、H-1を用いた以外は実施例13と同様にして有機EL素子を作成した。
本発明による有機EL素子は、発光特性、駆動寿命ならびに耐久性において、実用上満足できるレベルにあり、フラットパネルディスプレイ(携帯電話表示素子、車載表示素子、OAコンピュータ表示素子やテレビ等)、面発光体としての特徴を生かした光源(照明、複写機の光源、液晶ディスプレイや計器類のバックライト光源)、表示板や標識灯等への応用において、その技術的価値は大きいものである。
Claims (8)
- 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、環Aは隣接環と縮合する式(1a)で表される芳香環を示し、環Bは隣接環と縮合する式(1b)で表される複素環を表す。式(1a)において、Xはメチン又は窒素を表す。式(1b)において、Aは炭素数6~38の芳香族炭化水素基、炭素数1~10のアルキル基、炭素数3~11のシクロアルキル基又は式(1c)で示される芳香族複素環基を表す。
式(1c)において、Yはメチン又は窒素を表すが、少なくとも1つは窒素である。nは0又は1を表す。
一般式(1)及び(1c)において、Arはそれぞれ独立して炭素数6~30の芳香族炭化水素基、又は炭素数3~30の芳香族複素環基を表す。一般式(1)、(1a)及び(1c)において、Rはそれぞれ独立して水素、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(2)において、Aが縮環構造でない炭素数6~38の芳香族炭化水素基又は上記式(2c)で示される芳香族複素環基であることを特徴とする請求項2に記載の燐光発光素子用材料。
- 一般式(2)において、Arが縮環構造でない芳香族炭化水素基又は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。
- 基板上に、陽極、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1~5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6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7に記載の有機電界発光素子。
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JP2011507119A JP5027947B2 (ja) | 2009-03-31 | 2010-03-24 | 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 |
KR1020117025174A KR101302099B1 (ko) | 2009-03-31 | 2010-03-24 | 인광 발광 소자용 재료 및 이것을 사용한 유기 전계 발광 소자 |
US13/255,193 US8389131B2 (en) | 2009-03-31 | 2010-03-24 | Material for use in phosphorescent device and organic electroluminescent device using same |
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KR20160136220A (ko) * | 2015-05-19 | 2016-11-29 | 롬엔드하스전자재료코리아유한회사 | 인광 호스트 재료 및 이를 포함하는 유기 전계 발광 소자 |
JP7127095B2 (ja) | 2015-05-19 | 2022-08-29 | ローム・アンド・ハース・エレクトロニック・マテリアルズ・コリア・リミテッド | リンホスト材料及びそれを含む有機電界発光素子 |
KR102638345B1 (ko) * | 2015-05-19 | 2024-02-21 | 롬엔드하스전자재료코리아유한회사 | 인광 호스트 재료 및 이를 포함하는 유기 전계 발광 소자 |
JP2018520513A (ja) * | 2015-06-26 | 2018-07-26 | ローム・アンド・ハース・エレクトロニック・マテリアルズ・コリア・リミテッド | 多成分ホスト材料及びそれを含む有機電界発光デバイス |
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EP2415772A1 (en) | 2012-02-08 |
JP5027947B2 (ja) | 2012-09-19 |
JPWO2010113726A1 (ja) | 2012-10-11 |
EP2415772B1 (en) | 2018-05-16 |
EP2415772A4 (en) | 2013-05-29 |
KR20110134923A (ko) | 2011-12-15 |
US20110315975A1 (en) | 2011-12-29 |
US8389131B2 (en) | 2013-03-05 |
CN102341396B (zh) | 2014-03-12 |
TW201105771A (en) | 2011-02-16 |
CN102341396A (zh) | 2012-02-01 |
TWI471405B (zh) | 2015-02-01 |
KR101302099B1 (ko) | 2013-08-30 |
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