WO2018180215A1 - 有機エレクトロルミネッセンス素子 - Google Patents
有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2018180215A1 WO2018180215A1 PCT/JP2018/008131 JP2018008131W WO2018180215A1 WO 2018180215 A1 WO2018180215 A1 WO 2018180215A1 JP 2018008131 W JP2018008131 W JP 2018008131W WO 2018180215 A1 WO2018180215 A1 WO 2018180215A1
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- organic
- substituent
- carbon atoms
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- -1 arylamine compound Chemical class 0.000 claims abstract description 74
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 230000005525 hole transport Effects 0.000 claims abstract description 41
- 125000001424 substituent group Chemical group 0.000 claims description 54
- 125000004432 carbon atom Chemical group C* 0.000 claims description 44
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 23
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims description 21
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 13
- 125000003342 alkenyl group Chemical group 0.000 claims description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 10
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 125000004434 sulfur atom Chemical group 0.000 claims description 10
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 125000003545 alkoxy group Chemical group 0.000 claims description 7
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 7
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 7
- 238000005401 electroluminescence Methods 0.000 claims description 7
- 125000001153 fluoro group Chemical group F* 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 229910052805 deuterium Inorganic materials 0.000 claims description 6
- 125000004431 deuterium atom Chemical group 0.000 claims description 6
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 6
- 125000004104 aryloxy group Chemical group 0.000 claims description 5
- 125000000000 cycloalkoxy group Chemical group 0.000 claims description 3
- 125000005338 substituted cycloalkoxy group Chemical group 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 67
- 230000000903 blocking effect Effects 0.000 abstract description 17
- 239000010409 thin film Substances 0.000 abstract description 15
- 239000000243 solution Substances 0.000 abstract description 3
- PXLYGWXKAVCTPX-UHFFFAOYSA-N 1,2,3,4,5,6-hexamethylidenecyclohexane Chemical class C=C1C(=C)C(=C)C(=C)C(=C)C1=C PXLYGWXKAVCTPX-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 130
- 150000001875 compounds Chemical class 0.000 description 34
- 230000032258 transport Effects 0.000 description 27
- 238000000034 method Methods 0.000 description 26
- 239000000370 acceptor Substances 0.000 description 17
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 238000002156 mixing Methods 0.000 description 11
- 238000007740 vapor deposition Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 125000004076 pyridyl group Chemical group 0.000 description 6
- 238000004528 spin coating Methods 0.000 description 6
- 150000004982 aromatic amines Chemical class 0.000 description 5
- 125000003118 aryl group Chemical group 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- 239000010408 film Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 125000005842 heteroatom Chemical group 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 4
- 125000001624 naphthyl group Chemical group 0.000 description 4
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 4
- 125000001792 phenanthrenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C=CC12)* 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000000741 silica gel Substances 0.000 description 4
- 229910002027 silica gel Inorganic materials 0.000 description 4
- 125000005346 substituted cycloalkyl group Chemical group 0.000 description 4
- 238000005160 1H NMR spectroscopy Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 150000001412 amines Chemical group 0.000 description 3
- 125000002178 anthracenyl group Chemical group C1(=CC=CC2=CC3=CC=CC=C3C=C12)* 0.000 description 3
- 125000000499 benzofuranyl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 description 3
- 125000001164 benzothiazolyl group Chemical group S1C(=NC2=C1C=CC=C2)* 0.000 description 3
- 125000004196 benzothienyl group Chemical group S1C(=CC2=C1C=CC=C2)* 0.000 description 3
- 125000004541 benzoxazolyl group Chemical group O1C(=NC2=C1C=CC=C2)* 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 3
- 125000004623 carbolinyl group Chemical group 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000004440 column chromatography Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 125000004988 dibenzothienyl group Chemical group C1(=CC=CC=2SC3=C(C21)C=CC=C3)* 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 125000003914 fluoranthenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC=C4C1=C23)* 0.000 description 3
- 125000002541 furyl group Chemical group 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical group 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 125000003454 indenyl group Chemical group C1(C=CC2=CC=CC=C12)* 0.000 description 3
- 125000001041 indolyl group Chemical group 0.000 description 3
- 125000005956 isoquinolyl group Chemical group 0.000 description 3
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound 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 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000012044 organic layer Substances 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 125000003226 pyrazolyl group Chemical group 0.000 description 3
- 125000001725 pyrenyl group Chemical group 0.000 description 3
- 125000000714 pyrimidinyl group Chemical group 0.000 description 3
- 125000000168 pyrrolyl group Chemical group 0.000 description 3
- 150000004322 quinolinols Chemical class 0.000 description 3
- 125000005493 quinolyl group Chemical group 0.000 description 3
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 125000001544 thienyl group Chemical group 0.000 description 3
- 125000004306 triazinyl group Chemical group 0.000 description 3
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 3
- 125000006617 triphenylamine group Chemical group 0.000 description 3
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 description 3
- STTGYIUESPWXOW-UHFFFAOYSA-N 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline Chemical compound C=12C=CC3=C(C=4C=CC=CC=4)C=C(C)N=C3C2=NC(C)=CC=1C1=CC=CC=C1 STTGYIUESPWXOW-UHFFFAOYSA-N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- AWXGSYPUMWKTBR-UHFFFAOYSA-N 4-carbazol-9-yl-n,n-bis(4-carbazol-9-ylphenyl)aniline Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=CC=C(N(C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=2C=CC(=CC=2)N2C3=CC=CC=C3C3=CC=CC=C32)C=C1 AWXGSYPUMWKTBR-UHFFFAOYSA-N 0.000 description 2
- ZOKIJILZFXPFTO-UHFFFAOYSA-N 4-methyl-n-[4-[1-[4-(4-methyl-n-(4-methylphenyl)anilino)phenyl]cyclohexyl]phenyl]-n-(4-methylphenyl)aniline Chemical compound C1=CC(C)=CC=C1N(C=1C=CC(=CC=1)C1(CCCCC1)C=1C=CC(=CC=1)N(C=1C=CC(C)=CC=1)C=1C=CC(C)=CC=1)C1=CC=C(C)C=C1 ZOKIJILZFXPFTO-UHFFFAOYSA-N 0.000 description 2
- 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 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 101000837344 Homo sapiens T-cell leukemia translocation-altered gene protein Proteins 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- ASKJWWKRCVCJOA-UHFFFAOYSA-N N-[4-[4-(N-(9,9-diphenylfluoren-2-yl)anilino)phenyl]phenyl]-N,9,9-triphenylfluoren-2-amine Chemical group c1ccc(cc1)N(c1ccc(cc1)-c1ccc(cc1)N(c1ccccc1)c1ccc2-c3ccccc3C(c2c1)(c1ccccc1)c1ccccc1)c1ccc2-c3ccccc3C(c2c1)(c1ccccc1)c1ccccc1 ASKJWWKRCVCJOA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 description 2
- 102100028692 T-cell leukemia translocation-altered gene protein Human genes 0.000 description 2
- ABRVLXLNVJHDRQ-UHFFFAOYSA-N [2-pyridin-3-yl-6-(trifluoromethyl)pyridin-4-yl]methanamine Chemical compound FC(C1=CC(=CC(=N1)C=1C=NC=CC=1)CN)(F)F ABRVLXLNVJHDRQ-UHFFFAOYSA-N 0.000 description 2
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 150000001454 anthracenes Chemical class 0.000 description 2
- 150000001556 benzimidazoles Chemical class 0.000 description 2
- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 description 2
- UFVXQDWNSAGPHN-UHFFFAOYSA-K bis[(2-methylquinolin-8-yl)oxy]-(4-phenylphenoxy)alumane Chemical compound [Al+3].C1=CC=C([O-])C2=NC(C)=CC=C21.C1=CC=C([O-])C2=NC(C)=CC=C21.C1=CC([O-])=CC=C1C1=CC=CC=C1 UFVXQDWNSAGPHN-UHFFFAOYSA-K 0.000 description 2
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 description 2
- 150000001716 carbazoles Chemical group 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- SDVOZSYGHFDAKX-UHFFFAOYSA-N n,4-diphenyl-n-[4-[4-(n-(4-phenylphenyl)anilino)phenyl]phenyl]aniline Chemical group C1=CC=CC=C1N(C=1C=CC(=CC=1)C=1C=CC(=CC=1)N(C=1C=CC=CC=1)C=1C=CC(=CC=1)C=1C=CC=CC=1)C1=CC=C(C=2C=CC=CC=2)C=C1 SDVOZSYGHFDAKX-UHFFFAOYSA-N 0.000 description 2
- 150000004866 oxadiazoles Chemical class 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 150000003220 pyrenes Chemical class 0.000 description 2
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- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 2
- 150000003918 triazines Chemical class 0.000 description 2
- DETFWTCLAIIJRZ-UHFFFAOYSA-N triphenyl-(4-triphenylsilylphenyl)silane Chemical compound C1=CC=CC=C1[Si](C=1C=CC(=CC=1)[Si](C=1C=CC=CC=1)(C=1C=CC=CC=1)C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 DETFWTCLAIIJRZ-UHFFFAOYSA-N 0.000 description 2
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- XPNGNIFUDRPBFJ-UHFFFAOYSA-N (2-methylphenyl)methanol Chemical compound CC1=CC=CC=C1CO XPNGNIFUDRPBFJ-UHFFFAOYSA-N 0.000 description 1
- 0 *N(*)c(cc1)ccc1-c(cc1)ccc1N(c1ccccc1)[Al] Chemical compound *N(*)c(cc1)ccc1-c(cc1)ccc1N(c1ccccc1)[Al] 0.000 description 1
- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 description 1
- GPYDMVZCPRONLW-UHFFFAOYSA-N 1-iodo-4-(4-iodophenyl)benzene Chemical group C1=CC(I)=CC=C1C1=CC=C(I)C=C1 GPYDMVZCPRONLW-UHFFFAOYSA-N 0.000 description 1
- XNCMQRWVMWLODV-UHFFFAOYSA-N 1-phenylbenzimidazole Chemical compound C1=NC2=CC=CC=C2N1C1=CC=CC=C1 XNCMQRWVMWLODV-UHFFFAOYSA-N 0.000 description 1
- ZABORCXHTNWZRV-UHFFFAOYSA-N 10-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]phenoxazine Chemical compound O1C2=CC=CC=C2N(C2=CC=C(C=C2)C2=NC(=NC(=N2)C2=CC=CC=C2)C2=CC=CC=C2)C2=C1C=CC=C2 ZABORCXHTNWZRV-UHFFFAOYSA-N 0.000 description 1
- IVCGJOSPVGENCT-UHFFFAOYSA-N 1h-pyrrolo[2,3-f]quinoline Chemical class N1=CC=CC2=C(NC=C3)C3=CC=C21 IVCGJOSPVGENCT-UHFFFAOYSA-N 0.000 description 1
- PRWATGACIORDEL-UHFFFAOYSA-N 2,4,5,6-tetra(carbazol-9-yl)benzene-1,3-dicarbonitrile Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=C(C#N)C(N2C3=CC=CC=C3C3=CC=CC=C32)=C(N2C3=CC=CC=C3C3=CC=CC=C32)C(N2C3=CC=CC=C3C3=CC=CC=C32)=C1C#N PRWATGACIORDEL-UHFFFAOYSA-N 0.000 description 1
- GEQBRULPNIVQPP-UHFFFAOYSA-N 2-[3,5-bis(1-phenylbenzimidazol-2-yl)phenyl]-1-phenylbenzimidazole Chemical compound C1=CC=CC=C1N1C2=CC=CC=C2N=C1C1=CC(C=2N(C3=CC=CC=C3N=2)C=2C=CC=CC=2)=CC(C=2N(C3=CC=CC=C3N=2)C=2C=CC=CC=2)=C1 GEQBRULPNIVQPP-UHFFFAOYSA-N 0.000 description 1
- IXHWGNYCZPISET-UHFFFAOYSA-N 2-[4-(dicyanomethylidene)-2,3,5,6-tetrafluorocyclohexa-2,5-dien-1-ylidene]propanedinitrile Chemical compound FC1=C(F)C(=C(C#N)C#N)C(F)=C(F)C1=C(C#N)C#N IXHWGNYCZPISET-UHFFFAOYSA-N 0.000 description 1
- MBHPOBSZPYEADG-UHFFFAOYSA-N 2-bromo-9,9-dimethylfluorene Chemical compound C1=C(Br)C=C2C(C)(C)C3=CC=CC=C3C2=C1 MBHPOBSZPYEADG-UHFFFAOYSA-N 0.000 description 1
- 125000004974 2-butenyl group Chemical group C(C=CC)* 0.000 description 1
- NSMJMUQZRGZMQC-UHFFFAOYSA-N 2-naphthalen-1-yl-1H-imidazo[4,5-f][1,10]phenanthroline Chemical compound C12=CC=CN=C2C2=NC=CC=C2C2=C1NC(C=1C3=CC=CC=C3C=CC=1)=N2 NSMJMUQZRGZMQC-UHFFFAOYSA-N 0.000 description 1
- WXNYCQRAJCGMGJ-UHFFFAOYSA-N 2-phenyl-n-(2-phenylphenyl)-n-[4-[4-(2-phenyl-n-(2-phenylphenyl)anilino)phenyl]phenyl]aniline Chemical compound C1=CC=CC=C1C1=CC=CC=C1N(C=1C(=CC=CC=1)C=1C=CC=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C(=CC=CC=2)C=2C=CC=CC=2)C=2C(=CC=CC=2)C=2C=CC=CC=2)C=C1 WXNYCQRAJCGMGJ-UHFFFAOYSA-N 0.000 description 1
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 1
- GOLORTLGFDVFDW-UHFFFAOYSA-N 3-(1h-benzimidazol-2-yl)-7-(diethylamino)chromen-2-one Chemical compound C1=CC=C2NC(C3=CC4=CC=C(C=C4OC3=O)N(CC)CC)=NC2=C1 GOLORTLGFDVFDW-UHFFFAOYSA-N 0.000 description 1
- OGGKVJMNFFSDEV-UHFFFAOYSA-N 3-methyl-n-[4-[4-(n-(3-methylphenyl)anilino)phenyl]phenyl]-n-phenylaniline Chemical compound CC1=CC=CC(N(C=2C=CC=CC=2)C=2C=CC(=CC=2)C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C=C(C)C=CC=2)=C1 OGGKVJMNFFSDEV-UHFFFAOYSA-N 0.000 description 1
- FDRNXKXKFNHNCA-UHFFFAOYSA-N 4-(4-anilinophenyl)-n-phenylaniline Chemical group C=1C=C(C=2C=CC(NC=3C=CC=CC=3)=CC=2)C=CC=1NC1=CC=CC=C1 FDRNXKXKFNHNCA-UHFFFAOYSA-N 0.000 description 1
- FJXNABNMUQXOHX-UHFFFAOYSA-N 4-(9h-carbazol-1-yl)-n,n-bis[4-(9h-carbazol-1-yl)phenyl]aniline Chemical compound C12=CC=CC=C2NC2=C1C=CC=C2C(C=C1)=CC=C1N(C=1C=CC(=CC=1)C=1C=2NC3=CC=CC=C3C=2C=CC=1)C(C=C1)=CC=C1C1=C2NC3=CC=CC=C3C2=CC=C1 FJXNABNMUQXOHX-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- MZYDBGLUVPLRKR-UHFFFAOYSA-N 9-(3-carbazol-9-ylphenyl)carbazole Chemical compound C12=CC=CC=C2C2=CC=CC=C2N1C1=CC(N2C3=CC=CC=C3C3=CC=CC=C32)=CC=C1 MZYDBGLUVPLRKR-UHFFFAOYSA-N 0.000 description 1
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- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
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- 150000004867 thiadiazoles Chemical class 0.000 description 1
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- C07C211/61—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings being part of condensed ring systems of the carbon skeleton with at least one of the condensed ring systems formed by three or more rings
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- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/626—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
Definitions
- the present invention relates to an organic electroluminescence element which is a self-luminous element suitable for various display devices. Specifically, the present invention relates to an organic electroluminescence element (hereinafter referred to as organic EL) using a specific arylamine compound doped with an electron acceptor. (Abbreviated as an element).
- organic EL organic electroluminescence element
- an element a specific arylamine compound doped with an electron acceptor.
- the organic EL element is a self-luminous element, it has been actively researched because it is brighter and more visible than a liquid crystal element and can be clearly displayed.
- Non-Patent Document 2 An element utilizing light emission by thermally activated delayed fluorescence (TADF) has also been developed.
- TADF thermally activated delayed fluorescence
- the light emitting layer can be prepared by doping a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound or a material emitting delayed fluorescence.
- a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound or a material emitting delayed fluorescence.
- selection of an organic material in the organic EL element greatly affects various characteristics such as efficiency and durability of the element (for example, see Non-patent document 2).
- the light injected from both electrodes is recombined in the light emitting layer to obtain light emission, but it is important how efficiently both holes and electrons are transferred to the light emitting layer. It is necessary to make the device excellent in carrier balance.
- the probability of recombination of holes and electrons is improved by improving the hole injection property and blocking the electrons injected from the cathode, and further excitons generated in the light emitting layer. By confining, high luminous efficiency can be obtained. Therefore, the role of the hole transport material is important, and there is a demand for a hole transport material that has high hole injectability, high hole mobility, high electron blocking properties, and high durability against electrons. ing.
- the heat resistance and amorphous nature of the material are important for the lifetime of the element.
- thermal decomposition occurs even at a low temperature due to heat generated when the element is driven, and the material is deteriorated.
- the thin film is crystallized even in a short time, and the element is deteriorated. For this reason, the material used is required to have high heat resistance and good amorphous properties.
- NPD N, N′-diphenyl-N, N′-di ( ⁇ -naphthyl) benzidine (NPD) and various aromatic amine derivatives are known as hole transport materials that have been used in organic EL devices so far.
- NPD has a good hole transport capability, but its glass transition point (Tg), which is an index of heat resistance, is as low as 96 ° C., and device characteristics are degraded due to crystallization under high temperature conditions (for example, Non-patent document 4).
- Tg glass transition point
- An arylamine compound having a substituted carbazole structure has been proposed as a compound with improved characteristics such as heat resistance and hole injection properties (see, for example, Patent Document 4 and Patent Document 5).
- the material normally used for the layer is further doped with P by doping trisbromophenylamine hexachloroantimony, a radiolene derivative, F4-TCNQ, or the like.
- Patent Document 6 Although it has been proposed to improve the properties (see Patent Document 6 and Non-Patent Document 5), in an element using these compounds in a hole injection layer or a hole transport layer, low driving voltage, heat resistance, Although the luminous efficiency has been improved, it is not yet sufficient, and there is a demand for further lower driving voltage and higher luminous efficiency.
- JP-A-8-048656 Japanese Patent No. 3194657 Japanese Patent No. 4943840 JP 2006-151979 A International Publication No. 2008/62636 JP 2011-100651 A
- the object of the present invention is as a material for organic EL elements with high luminous efficiency and high durability, as well as organic materials excellent in hole and electron injection / transport performance, electron blocking ability, stability in a thin film state, and durability.
- the physical characteristics that the organic EL element to be provided by the present invention should have include (1) a low emission start voltage, (2) a low practical drive voltage, and (3) a light emission efficiency and a power efficiency. And (4) long life.
- the present inventors have focused on the fact that arylamine-based materials doped with a specific electron acceptor are excellent in hole injection and transport capability, thin film stability and durability. Select a specific arylamine compound (having a structure) to efficiently inject and transport holes from the anode, and produce various organic EL devices doped with electron acceptors in the hole injection layer material Then, the characteristics of the device were intensively evaluated. As a result, the present invention has been completed.
- the following organic EL elements are provided.
- the hole injection layer is an arylamine represented by the following general formula (1)
- An organic EL device comprising a compound and a radialene derivative represented by the following general formula (2).
- R 1 is a deuterium atom, fluorine atom, chlorine atom, cyano group, nitro group, a linear or branched alkyl group having 1 to 6 carbon atoms which may have a substituent, substituted A cycloalkyl group having 5 to 10 carbon atoms which may have a group, a linear or branched alkenyl group having 2 to 6 carbon atoms which may have a substituent, and a substituent.
- R 2 , R 1 represents a linear or branched alkyloxy group having 1 to 6 carbon atoms, or a cycloalkyloxy group having 5 to 10 carbon atoms which may have a substituent.
- 3 has a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a nitro group, a linear or branched alkyl group having 1 to 6 carbon atoms which may have a substituent, or a substituent.
- a cycloalkyl group a linear or branched alkenyl group having 2 to 6 carbon atoms which may have a substituent, a linear or branched group having 1 to 6 carbon atoms which may have a substituent; Alkyloxy group, optionally substituted cycloalkyloxy group having 5 to 10 carbon atoms, substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group, substituted Or an unsubstituted condensed polycyclic aromatic group, or a substituted or unsubstituted aryloxy group, r 1 to r 3 may be the same or different, and r 1 represents 0 to 5, r 2 , r 3 Represents 0 to 4.
- R 1 to R 3 bonded to the same benzene ring are the same as each other But it can be different, single bond, substituted or Conversion methylene group, an oxygen atom or .Ar 1 ⁇ Ar 3 may be bonded to each other to form a ring via the sulfur atom may be the same or different, a substituted or unsubstituted aromatic hydrocarbon group Represents a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.
- Ar 4 to Ar 6 may be the same as or different from each other, and each represents an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed polycyclic aromatic group having an electron acceptor group as a substituent.
- Formula (1) represented by R 1 ⁇ R 3 in "linear or branched alkyl group having 1 to carbon atoms which may have a substituent 6" has "substituent In the “cycloalkyl group having 5 to 10 carbon atoms” or “straight or branched alkenyl group having 2 to 6 carbon atoms which may have a substituent”.
- Examples of “straight or branched alkyl group of 6”, “cycloalkyl group of 5 to 10 carbon atoms” or “straight chain or branched alkenyl group of 2 to 6 carbon atoms” specifically include , Methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, cyclopentyl group, cyclo A xyl group, a 1-adamantyl group, a 2-adamantyl group, a vinyl group, an allyl group, an isopropenyl group, a 2-butenyl group, and the like.
- These groups are a single bond, a substituted or unsubstituted methylene group, A ring may be formed by bonding to each other via an oxygen atom or a sulfur atom.
- a ring may be formed by bonding to each other via an oxygen atom or a sulfur atom.
- r 1 is an integer of 2 to 5, or r 2 and r 3 are integers of 2 to 4
- the groups may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- a linear or branched alkyl group having 1 to 6 carbon atoms having a substituent represented by R 1 to R 3 in formula (1), “5 to 10 carbon atoms having a substituent”
- Specific examples of the “substituent” in the “cycloalkyl group of” or “straight-chain or branched alkenyl group having 2 to 6 carbon atoms having a substituent” include a deuterium atom, a cyano group, and a nitro group; Halogen atoms such as fluorine, chlorine, bromine and iodine; linear or branched alkyloxy having 1 to 6 carbon atoms such as methyloxy, ethyloxy and propyloxy; vinyl and allyl Alkenyl groups such as phenyl groups; aryloxy groups such as phenyloxy groups and tolyloxy groups; arylalkyloxy groups such as benzyloxy groups and phenethyloxy groups; Group, biphenylyl group,
- the groups may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- these groups may have a substituent, and the substituent is represented by R 1 to R 3 in the general formula (1), which is a straight chain having 1 to 6 carbon atoms having a substituent.
- aromatic hydrocarbon group aromatic heterocyclic group or “fused polycyclic aromatic group” in the “ring aromatic group”
- phenyl group, biphenylyl group, terphenylyl group, naphthyl group, anthracenyl group Group phenanthrenyl group, fluorenyl group, indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group, triphenylenyl group, pyridyl group, pyrimidinyl group, triazinyl group, furyl group, pyrrolyl group, thienyl group, quinolyl group, isoquinolyl group, benzofurany
- R 2 and R 3 may be bonded to each other via a single bond or a substituted or unsubstituted methylene group, oxygen atom, or sulfur atom to form a ring. Further, these groups may have a substituent, and the substituent is represented by R 1 to R 3 in the general formula (1), which is a straight chain having 1 to 6 carbon atoms having a substituent.
- aryloxy group in the “substituted or unsubstituted aryloxy group” represented by R 2 and R 3 in the general formula (1) include a phenyloxy group, a biphenylyloxy group, a terfeny group.
- Examples include ryloxy group, naphthyloxy group, anthracenyloxy group, phenanthrenyloxy group, fluorenyloxy group, indenyloxy group, pyrenyloxy group, perylenyloxy group, and the like.
- a ring may be formed by bonding to each other via a bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom.
- these groups may have a substituent, and the substituent is represented by R 1 to R 3 in the general formula (1), which is a straight chain having 1 to 6 carbon atoms having a substituent.
- R 1 to R 3 in the general formula (1), which is a straight chain having 1 to 6 carbon atoms having a substituent.
- Substituted or unsubstituted aromatic hydrocarbon group “substituted or unsubstituted aromatic heterocyclic group” represented by Ar 1 to Ar 3 in general formula (1), or “substituted or unsubstituted condensed hydrocarbon group”
- the “aromatic hydrocarbon group”, “aromatic heterocyclic group” or “condensed polycyclic aromatic group” in the “ring aromatic group” is represented by R 2 and R 3 in the general formula (1).
- Aromatic hydrocarbon group “aromatic” in “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group” or “substituted or unsubstituted condensed polycyclic aromatic group” Examples thereof include those similar to those shown for “Aromatic heterocyclic group” or “Condensed polycyclic aromatic group”. Further, these groups may have a substituent, and the substituent is represented by R 1 to R 3 in the general formula (1), which is a straight chain having 1 to 6 carbon atoms having a substituent.
- Examples of the “body group” include a fluorine atom, a chlorine atom, a bromine atom, a cyano group, a trifluoromethyl group, a nitro group, and the like.
- Aromamatics in the “aromatic hydrocarbon group, aromatic heterocyclic group, or condensed polycyclic aromatic group having an electron acceptor group as a substituent” represented by Ar 4 to Ar 6 in the general formula (2)
- the “hydrocarbon group”, “aromatic heterocyclic group” or “condensed polycyclic aromatic group” includes “substituted or unsubstituted aromatic carbonized carbon atoms represented by Ar 1 to Ar 3 in the general formula (1)”.
- ring aromatic group The thing similar to what was shown regarding "ring aromatic group” can be mention
- these groups may have a substituent other than the electron acceptor group. Specific examples of the substituent include a deuterium atom; a phenyl group, a biphenylyl group, a terphenylyl group, a naphthyl group, an anthracenyl group.
- Aromatic hydrocarbon groups or condensed polycyclic aromatic groups such as phenanthrenyl group, fluorenyl group, indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group, triphenylenyl group; pyridyl group, pyrimidinyl group, triazinyl group, thienyl group, Furyl, pyrrolyl, quinolyl, isoquinolyl, benzofuranyl, benzothienyl, indolyl, carbazolyl, benzoxazolyl, benzothiazolyl, quinoxalinyl, benzoimidazolyl, pyrazolyl, dibenzofuranyl, dibenzothienyl Group, carbolinyl group, etc.
- substituents may further the exemplified substituents or electron acceptor group, it may be substituted. These substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, an oxygen atom or a sulfur atom to form a ring.
- a substituted or unsubstituted aromatic hydrocarbon group is preferable, and a substituted or unsubstituted phenyl group, biphenylyl group, or terphenylyl group is more preferable.
- r 1 to r 3 are preferably 0 to 2, and more preferably 0 or 1.
- Ar 4 to Ar 6 in the general formula (2) are preferably “aromatic hydrocarbon group”, “condensed polycyclic aromatic group”, or pyridyl group, and include phenyl group, biphenylyl group, terphenylyl group, naphthyl group, A phenanthrenyl group, a fluorenyl group, and a pyridyl group are more preferable.
- Ar 4 to Ar 6 in the general formula (2) are at least partially, preferably completely substituted with an “electron acceptor group” such as a fluorine atom, a chlorine atom, a cyano group, or a trifluoromethyl group. Embodiments are preferred.
- Ar 4 to Ar 6 in the general formula (2) include a tetrafluoropyridyl group, a tetrafluoro- (trifluoromethyl) phenyl group, a cyano-tetrafluorophenyl group, a dichloro-difluoro- (trifluoromethyl) phenyl group, A phenyl group or a pyridyl group completely substituted with a fluorine atom such as a pentafluorophenyl group, a chlorine atom, a cyano group, or a trifluoromethyl group is preferred.
- the arylamine compound represented by the general formula (1) which is preferably used in the organic EL device of the present invention, is used as a constituent material of a hole injection layer, an electron blocking layer or a hole transport layer of the organic EL device. be able to. It is a compound that has a high hole mobility and is preferable as a material for the hole injection layer or the hole transport layer. In addition, it has a high electron blocking performance and is a preferred compound as a material for the electron blocking layer.
- the radicalene derivative represented by the general formula (2) which is preferably used in the organic EL device of the present invention, is used as a P-doping material for a material usually used for a hole injection layer or a hole transport layer of the organic EL device. Preferred compounds.
- the organic EL element of the present invention combines materials for organic EL elements excellent in hole injection / transport performance, thin film stability and durability in consideration of carrier balance, conventional organic EL elements As compared with the above, by improving the hole transport efficiency from the anode to the hole transport layer, the light emission efficiency can be improved and the durability of the organic EL element can be improved while maintaining a low driving voltage. It has become possible to realize an organic EL element with a low driving voltage, high luminous efficiency, and long life.
- a specific (having a structure) arylamine compound capable of effectively expressing the role of hole injection / transport is selected as the material of the hole injection layer, and a specific electron acceptor is P-doped.
- holes can be efficiently injected and transported from the electrode to the hole transport layer, and the efficiency of hole injection and transport to the light emitting layer can be improved, resulting in excellent hole injection and transport performance and low drive.
- An organic EL element with high luminous efficiency can be realized with voltage.
- by selecting a material for the hole transport layer without P doping of a specific (having a structure) arylamine compound it is combined so that the carrier balance can be refined, with a low driving voltage, and high luminous efficiency.
- a long-life organic EL element can be realized. According to the present invention, it is possible to improve luminous efficiency, particularly durability, while maintaining a low driving voltage of a conventional organic EL element.
- FIG. 6 is a diagram showing organic EL element configurations of Examples 4 to 6 and Comparative Examples 1 and 2.
- the arylamine compound represented by the general formula (1) was purified by column chromatography, adsorption purification using silica gel, activated carbon, activated clay, etc., recrystallization using a solvent, crystallization method, sublimation purification method, and the like.
- the compound was identified by NMR analysis.
- melting point, glass transition point (Tg) and work function were measured.
- the melting point is an index of vapor deposition
- the glass transition point (Tg) is an index of stability in a thin film state
- the work function is an index of hole transportability and hole blocking property.
- the compound used in the organic EL device of the present invention is purified by column chromatography, adsorption purification using silica gel, activated carbon, activated clay, etc., purification by recrystallization or crystallization using a solvent, and finally sublimation.
- the product purified by the purification method was used.
- the substrate is composed of an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode sequentially on the substrate, and the hole transport layer and the light emitting layer. And those having a hole blocking layer between the light emitting layer and the electron transport layer, and those having an electron injection layer between the electron transport layer and the cathode.
- a structure that serves as a hole injection layer and a hole transport layer and a structure that serves as an electron injection layer and an electron transport layer. And so on.
- the hole transport layer has a structure in which two layers of a first hole transport layer and a second hole transport layer are laminated.
- an electrode material having a large work function such as ITO or gold is used.
- a material in which a specific electron acceptor is P-doped to the arylamine compound represented by the general formula (1) is preferably used.
- Examples of hole injection / transport materials that can be mixed or used simultaneously with the arylamine compound represented by the general formula (1) include starburst type triphenylamine derivatives and various triphenylamine tetramers.
- N, N′-diphenyl-N, N′-di (m-tolyl) benzidine Benzidine derivatives such as TPD
- N, N′-diphenyl-N, N′-di ( ⁇ -naphthyl) benzidine NPD
- N, N, N ′, N′-tetrabiphenylylbenzidine 1,1-bis [4- (Di-4-tolylamino) phenyl] cyclohexane (TAPC) and other arylamine compounds having a structure in which two triphenylamine structures are linked by a divalent group containing no single bond or heteroatom in the molecule
- Arylamine compounds having a structure in which four triphenylamine structures are linked by a single bond or a divalent group not containing a hetero atom in the molecule various triphenylamine trimers
- a coating type polymer material such as poly (3,4-ethylenedioxythiophene) (PEDOT) / poly (styrene sulfonate) (PSS) can be used for the hole injection / transport layer.
- PEDOT poly (3,4-ethylenedioxythiophene)
- PSS poly (styrene sulfonate)
- a hole transporting arylamine compound is preferably used, and in particular, the arylamine compound represented by the general formula (1) is preferably used. Those not doped with P are preferably used. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- an arylamine compound having a structure in which four triphenylamine structures are connected by a divalent group not containing a single bond or a hetero atom in the molecule, or triphenyl in the molecule.
- An arylamine compound having a structure in which two amine structures are linked by a single bond or a divalent group containing no hetero atom 4,4 ′, 4 ′′ -tri (N-carbazolyl) triphenylamine (TCTA), 9 , 9-bis [4- (carbazol-9-yl) phenyl] fluorene, 1,3-bis (carbazol-9-yl) benzene (mCP), 2,2-bis (4-carbazol-9-ylphenyl) Carbazole derivatives such as adamantane (Ad-Cz), 9- [4- (carbazol-9-yl) phenyl] -9- [4- (triphenylsilyl) phenyl It is possible to use a compound having an electron blocking action, such as a compound having a triphenylsilyl group and a triarylamine structure represented by sulfonyl]-9H-fluorene.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- the electron acceptor is not P-doped in a layer adjacent to the light emitting layer (for example, a hole transport layer, an electron blocking layer, etc.).
- a layer adjacent to the light emitting layer for example, a hole transport layer, an electron blocking layer, etc.
- an arylamine compound having a high electron blocking property is preferably used, and an arylamine compound represented by the general formula (1) is preferably used.
- the thicknesses of these layers are not particularly limited as long as they are usually used.
- the hole transport layer is 20 to 100 nm and the electron blocking layer is 5 to 30 nm.
- the light emitting layer of the organic EL device of the present invention other amine derivatives, pyrene derivatives, various metal complexes such as metal complexes of quinolinol derivatives, including Alq 3, anthracene derivatives, bisstyrylbenzene derivatives, oxazole derivatives, poly A paraphenylene vinylene derivative or the like can be used.
- the light-emitting layer may be composed of a host material and a dopant material, and as the host material, a thiazole derivative, a benzimidazole derivative, a polydialkylfluorene derivative, or the like can be used.
- amine derivatives and pyrene derivatives quinacridone, coumarin, rubrene, perylene, and derivatives thereof, benzopyran derivatives, indenophenanthrene derivatives, rhodamine derivatives, aminostyryl derivatives, and the like can be used as dopant materials. These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- a phosphorescent emitter As the phosphorescent emitter, a phosphorescent emitter of a metal complex such as iridium or platinum can be used. Green phosphorescent emitters such as Ir (ppy) 3 , blue phosphorescent emitters such as FIrpic and FIr6, red phosphorescent emitters such as Btp 2 Ir (acac), and the like are used as host materials. As the hole injecting / transporting host material, carbazole derivatives such as 4,4′-di (N-carbazolyl) biphenyl (CBP), TCTA, and mCP can be used.
- CBP 4,4′-di (N-carbazolyl) biphenyl
- CBP 4,4′-di (N-carbazolyl) biphenyl
- TCTA TCTA
- mCP mCP
- p-bis (triphenylsilyl) benzene (UGH2) and 2,2 ′, 2 ′′-(1,3,5-phenylene) -tris (1-phenyl-1H-benzimidazole) ) (TPBI) or the like, and a high-performance organic EL element can be manufactured.
- the phosphorescent light-emitting material into the host material by co-evaporation in the range of 1 to 30 weight percent with respect to the entire light-emitting layer.
- Non-Patent Document 3 a material that emits delayed fluorescence such as CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN as the light emitting material (see, for example, Non-Patent Document 3).
- CDCB derivatives such as PIC-TRZ, CC2TA, PXZ-TRZ, and 4CzIPN
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- a phenanthroline derivative such as bathocuproine (BCP) or a quinolinol derivative such as aluminum (III) bis (2-methyl-8-quinolinato) -4-phenylphenolate (BAlq)
- BCP bathocuproine
- BAlq quinolinol derivative
- various rare earth complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, and other compounds having a hole blocking action can be used.
- These materials may also serve as the material for the electron transport layer.
- These may be formed alone, but may be used as a single layer formed by mixing with other materials, layers formed alone, mixed layers formed, or A stacked structure of layers formed by mixing with a layer formed alone may be used.
- These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- metal complexes of quinolinol derivatives including Alq 3 and BAlq various metal complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, pyridine derivatives, pyrimidine derivatives, benzimidazoles.
- Derivatives, thiadiazole derivatives, anthracene derivatives, carbodiimide derivatives, quinoxaline derivatives, pyridoindole derivatives, phenanthroline derivatives, silole derivatives, and the like can be used.
- These may be formed alone, or may be used as a single layer formed by mixing with other electron transporting materials, or may be formed by mixing layers formed alone.
- a layered structure of layers formed by mixing layers with each other or a layer formed by itself may be used. These materials can be formed into a thin film by a known method such as a spin coating method or an ink jet method in addition to a vapor deposition method.
- an alkali metal salt such as lithium fluoride and cesium fluoride
- an alkaline earth metal salt such as magnesium fluoride
- a metal oxide such as aluminum oxide
- an electrode material having a low work function such as aluminum or an alloy having a lower work function such as a magnesium silver alloy, a magnesium indium alloy, or an aluminum magnesium alloy is used as the electrode material.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport layer on a glass substrate 1 on which an ITO electrode is previously formed as a transparent anode 2. 6, an electron injection layer 7 and a cathode (aluminum electrode) 8 were deposited in this order.
- the glass substrate 1 formed with ITO having a film thickness of 150 nm was subjected to ultrasonic cleaning in isopropyl alcohol for 20 minutes, and then dried on a hot plate heated to 200 ° C. for 10 minutes. Then, after performing UV ozone treatment for 15 minutes, this glass substrate with ITO was attached in a vacuum evaporation machine, and pressure was reduced to 0.001 Pa or less. Subsequently, as a hole injection layer 3 so as to cover the transparent anode 2, an electron acceptor (Acceptor-1) having the following structural formula and the compound (1-1) are deposited at a deposition rate ratio of Acceptor-1: Compound (1-1).
- an electron acceptor (Acceptor-1) having the following structural formula and the compound (1-1) are deposited at a deposition rate ratio of Acceptor-1: Compound (1-1).
- binary deposition was performed at a deposition rate of 30 nm.
- the compound (1-1) was formed as the hole transport layer 4 so as to have a film thickness of 40 nm.
- Binary vapor deposition was performed at a vapor deposition rate to form a film thickness of 20 nm.
- lithium fluoride was formed as the electron injection layer 7 so as to have a film thickness of 1 nm.
- aluminum was deposited to a thickness of 100 nm to form the cathode 8.
- the characteristic measurement was performed at normal temperature in air
- Example 4 An organic EL device was produced under the same conditions except that the compound (1-20) was used in place of the compound (1-1) as a material for the hole injection layer and the hole transport layer. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Example 4 an organic EL device was produced under the same conditions except that the compound (1-21) was used in place of the compound (1-1) as the material for the hole injection layer and the hole transport layer.
- the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the measurement results of the light emission characteristics when a DC voltage was applied to the produced organic EL element.
- Example 4 For comparison, in Example 4, the same conditions were used except that (HTM-1) having the following structural formula was used instead of the compound (1-1) as the material of the hole injection layer and the hole transport layer.
- An organic EL element was produced. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Example 2 For comparison, in Example 4, the same conditions were used except that (HTM-2) having the following structural formula was used instead of the compound (1-1) as the material of the hole injection layer and the hole transport layer.
- An organic EL element was produced. About the produced organic EL element, the characteristic measurement was performed at normal temperature in air
- Table 1 summarizes the results of measuring the lifetime of the elements using the organic EL elements prepared in Examples 4 to 6 and Comparative Examples 1 and 2.
- the element lifetime is equivalent to 95% of the emission luminance of 1900 cd / m 2 (when the initial luminance is 100%) when the constant current drive is performed with the emission luminance (initial luminance) at the start of light emission being 2000 cd / m 2 : It was measured as the time to decay to 95% decay.
- the luminous efficiency when a current density of 10 mA / cm 2 was passed was that of the organic EL elements of Comparative Examples 1 and 2.
- the organic EL elements of Examples 4 to 6 had high efficiency of 8.31 to 8.70 cd / A.
- the organic EL elements of Examples 4 to 6 are 7.24 to 7.58 lm / W, which is higher than the organic EL elements of Comparative Examples 1 and 2 of 6.84 to 6.89 lm / W. It was efficiency.
- the organic EL elements of Examples 4 to 6 have a longer life of 325 to 361 hours compared to 269 to 277 hours of the organic EL elements of Comparative Examples 1 and 2. I understand.
- the organic EL device of the present invention efficiently injects and transports holes from the electrode to the hole transport layer by selecting a specific arylamine compound as the material of the hole injection layer and P-doping a specific electron acceptor. It was found that the carrier balance inside the organic EL element can be improved, and an organic EL element with higher luminous efficiency and longer life can be realized as compared with the conventional organic EL element.
- the organic EL device of the present invention which combines a specific arylamine compound and a specific electron acceptor so that the carrier balance inside the organic EL device can be refined, improves the luminous efficiency and improves the durability of the organic EL device. For example, it has become possible to expand to household appliances and lighting applications.
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Abstract
Description
そして、熱活性化遅延蛍光(TADF)による発光を利用する素子も開発されている。2011年に九州大学の安達らは、熱活性化遅延蛍光材料を用いた素子によって5.3%の外部量子効率を実現させた(例えば、非特許文献3参照)。
また、これらの基は置換基を有していてもよく、置換基として、前記一般式(1)中のR1~R3で表される「置換基を有する炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基」、「置換基を有する炭素原子数5ないし10のシクロアルキル基」または「置換基を有する炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基」における「置換基」に関して示したものと同様のものをあげることができ、とりうる態様も、同様のものをあげることができる。
ここで、R2とR3は、単結合、または置換もしくは無置換のメチレン基、酸素原子、硫黄原子を介して互いに結合して環を形成してもよい。
また、これらの基は置換基を有していてもよく、置換基として、前記一般式(1)中のR1~R3で表される「置換基を有する炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基」、「置換基を有する炭素原子数5ないし10のシクロアルキル基」または「置換基を有する炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基」における「置換基」に関して示したものと同様のものをあげることができ、とりうる態様も、同様のものをあげることができる。
また、これらの基は置換基を有していてもよく、置換基として、前記一般式(1)中のR1~R3で表される「置換基を有する炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基」、「置換基を有する炭素原子数5ないし10のシクロアルキル基」または「置換基を有する炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基」における「置換基」に関して示したものと同様のものをあげることができ、とりうる態様も、同様のものをあげることができる。
また、これらの基は置換基を有していてもよく、置換基として、前記一般式(1)中のR1~R3で表される「置換基を有する炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基」、「置換基を有する炭素原子数5ないし10のシクロアルキル基」または「置換基を有する炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基」における「置換基」に関して示したものと同様のものをあげることができ、とりうる態様も、同様のものをあげることができる。
また、これらの基は電子受容体基以外にも置換基を有していてもよく、置換基としては、具体的に、重水素原子;フェニル基、ビフェニリル基、ターフェニリル基、ナフチル基、アントラセニル基、フェナントレニル基、フルオレニル基、インデニル基、ピレニル基、ペリレニル基、フルオランテニル基、トリフェニレニル基などの芳香族炭化水素基もしくは縮合多環芳香族基;ピリジル基、ピリミジニル基、トリアジニル基、チエニル基、フリル基、ピロリル基、キノリル基、イソキノリル基、ベンゾフラニル基、ベンゾチエニル基、インドリル基、カルバゾリル基、ベンゾオキサゾリル基、ベンゾチアゾリル基、キノキサリニル基、ベンゾイミダゾリル基、ピラゾリル基、ジベンゾフラニル基、ジベンゾチエニル基、カルボリニル基などの芳香族複素環基をあげることができ、これらの置換基は、さらに前記例示した置換基、もしくは電子受容体基が置換していてもよい。そして、これらの置換基同士が単結合、置換もしくは無置換のメチレン基、酸素原子または硫黄原子を介して互いに結合して環を形成していてもよい。
一般式(2)中のAr4~Ar6は、少なくとも部分的に、好ましくは完全に、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基などの「電子受容体基」で置換されている態様が好ましい。
一般式(2)中のAr4~Ar6としては、テトラフルオロピリジル基、テトラフルオロ-(トリフルオロメチル)フェニル基、シアノ-テトラフルオロフェニル基、ジクロロ-ジフルオロ-(トリフルオロメチル)フェニル基、ペンタフルオロフェニル基、などのフッ素原子、塩素原子、シアノ基、またはトリフルオロメチル基で完全に置換されたフェニル基もしくはピリジル基が好ましい。
低駆動電圧、高発光効率、かつ長寿命の有機EL素子を実現することが可能となった。
さらに、特定の(構造を有する)アリールアミン化合物をPドーピングしないで、正孔輸送層の材料に選択することによって、キャリアバランスを精緻化できるように組み合わせ、低駆動電圧であって、高発光効率、かつ長寿命の有機EL素子を実現することができる。
本発明によれば、従来の有機EL素子の低駆動電圧を維持しつつ、発光効率、特に耐久性を改良することができる。
その他、本発明の有機EL素子に用いられる化合物は、カラムクロマトグラフによる精製、シリカゲル、活性炭、活性白土などによる吸着精製、溶媒による再結晶や晶析法などによって精製を行った後、最後に昇華精製法によって精製したものを用いた。
前記一般式(1)で表されるアリールアミン化合物と混合もしくは同時に使用できる、正孔注入・輸送性の材料としては、スターバースト型のトリフェニルアミン誘導体、種々のトリフェニルアミン4量体などの材料;銅フタロシアニンに代表されるポルフィリン化合物;ヘキサシアノアザトリフェニレンのようなアクセプター性の複素環化合物や塗布型の高分子材料、などを用いることができる。これらの材料は蒸着法の他、スピンコート法やインクジェット法などの公知の方法によって薄膜形成を行うことができる。
本発明の有機EL素子の正孔輸送層としては、正孔輸送性のアリールアミン化合物が好適に用いられ、特に前記一般式(1)で表されるアリールアミン化合物が好適に用いられる。そして、Pドーピングしないものが好適に用いられる。これらは、単独で成膜してもよいが、他の材料とともに混合して成膜した単層として使用してもよく、単独で成膜した層同士、混合して成膜した層同士、または単独で成膜した層と混合して成膜した層の積層構造としてもよい。これらの材料は蒸着法の他、スピンコート法やインクジェット法などの公知の方法によって薄膜形成を行うことができる。
これらの層には、電子阻止性の高いアリールアミン化合物が好適に用いられ、前記一般式(1)で表されるアリールアミン化合物などが好ましく用いられる。
また、これらの層の膜厚は、通常用いられる膜厚であれば特に限定するものではないが、例えば、正孔輸送層としては20~100nm、電子阻止層としては5~30nmで用いられる。
窒素置換した反応容器に、N-(フェニル)-ビフェニル-4-アミン10.0g、4,4’-ジヨードビフェニル7.2g、炭酸カリウム7.4g、次亜硫酸ナトリウム0.6g、銅粉0.1g、ドデシルベンゼン7.2ml、キシレン7.2mlを加え、210℃で20時間撹拌した。反応液を冷却しながらトルエンを加え、50℃で熱濾過し濾液を室温まで冷却した後に、撹拌しながらメタノールを加え、析出した固体を濾過により採取した。得られた固体をトルエン-メタノールで再結晶し、4,4’-ビス[ビフェニル-4-イル(フェニル)アミノ]ビフェニル(化合物1-1)の黄白色粉体10.0g(収率88%)を得た。
1H-NMR(CDCl3)で以下の36個の水素のシグナルを検出した。
δ(ppm)=7.38-7.72(16H)、7.10-7.38(18H)、7.07-7.08(2H)。
窒素置換した反応容器に、(9,9-ジメチルフルオレン-2-イル)-(ビフェニル-4-イル)-(6-ブロモビフェニル-3-イル)アミン10.0g、4-(ジフェニルアミノ)フェニルボロン酸7.9g、テトラキストリフェニルホスフィンパラジウム(0)0.60g、炭酸カリウム5.0g、トルエン80ml、エタノール40ml、水30mlを加えて加熱し、100℃で一晩撹拌した。冷却し、分液操作により有機層を採取した後、濃縮し、カラムクロマトグラフ(担体:シリカゲル、溶離液:ジクロロメタン/ヘプタン)によって精製することにより、4-{(9,9-ジメチルフルオレン-2-イル)-(ビフェニル-4-イル)アミノ}-4’-(ジフェニルアミノ)-2-フェニル-ビフェニル(化合物1-20)の白色粉体11.5g(収率75%)を得た。
1H-NMR(CDCl3)で以下の44個の水素のシグナルを検出した。
δ(ppm)=7.71-7.64(4H)、7.58-7.56(2H)、7.49-6.94(32H)、1.51(6H)。
窒素置換した反応容器に、ビス(フェニルアミノ)ビフェニル10.0g、2-ブロモ-9,9-ジメチルフルオレン17.1g、トルエン100ml、tert-ブトキシナトリウム8.6gを加え、30分間超音波を照射しながら窒素ガスを通気した。酢酸パラジウム0.1g、tert-ブチルホスフィンの50%(w/w)トルエン溶液0.2gを加えて加熱し、100℃で3時間撹拌した。80℃まで冷却し熱濾過した。濾液にシリカゲル、活性白土を加え吸着精製を行い、濾過により固体を除去した。濾液を濃縮し、析出した固体を濾過により採取した。得られた固体をトルエンで再結晶し、4,4’-ビス[(9,9-ジフェニルフルオレン-2-イル)(フェニル)アミノ]ビフェニル(化合物1-21)の黄色粉体16.4g(収率77%)を得た。
1H-NMR(CDCl3)で以下の44個の水素のシグナルを検出した。
δ(ppm)=7.62-7.65(4H)、7.52-7.53(4H)、7.10-7.45(20H)、7.06-7.10(4H)、1.47(12H)。
比較のために、実施例4において、正孔注入層および正孔輸送層の材料として化合物(1-1)に代えて下記構造式の(HTM-1)を用いた以外は、同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行った。作製した有機EL素子に直流電圧を印加したときの発光特性の測定結果を表1にまとめて示した。
比較のために、実施例4において、正孔注入層および正孔輸送層の材料として化合物(1-1)に代えて下記構造式の(HTM-2)を用いた以外は、同様の条件で有機EL素子を作製した。作製した有機EL素子について、大気中、常温で特性測定を行った。作製した有機EL素子に直流電圧を印加したときの発光特性の測定結果を表1にまとめて示した。
2 透明陽極
3 正孔注入層
4 正孔輸送層
5 発光層
6 電子輸送層
7 電子注入層
8 陰極
Claims (5)
- 少なくとも陽極、正孔注入層、正孔輸送層、発光層、電子輸送層および陰極をこの順に有する有機エレクトロルミネッセンス素子において、前記正孔注入層が下記一般式(1)で表されるアリールアミン化合物および下記一般式(2)で表されるラジアレン誘導体を含有することを特徴とする有機エレクトロルミネッセンス素子。
(1)
(式中、R1は重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、または置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基を表す。R2、R3は重水素原子、フッ素原子、塩素原子、シアノ基、ニトロ基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキル基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキル基、置換基を有していてもよい炭素原子数2ないし6の直鎖状もしくは分岐状のアルケニル基、置換基を有していてもよい炭素原子数1ないし6の直鎖状もしくは分岐状のアルキルオキシ基、置換基を有していてもよい炭素原子数5ないし10のシクロアルキルオキシ基、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、置換もしくは無置換の縮合多環芳香族基、または置換もしくは無置換のアリールオキシ基を表す。r1~r3は同一でも異なってもよく、r1は0~5を表し、r2、r3は0~4を表す。r1が2~5である場合、または、r2、r3が2~4である場合、同一のベンゼン環に複数個結合するR1~R3は相互に同一でも異なってもよく、単結合、置換もしくは無置換のメチレン基、酸素原子または硫黄原子を介して互いに結合して環を形成してもよい。Ar1~Ar3は相互に同一でも異なってもよく、置換もしくは無置換の芳香族炭化水素基、置換もしくは無置換の芳香族複素環基、または置換もしくは無置換の縮合多環芳香族基を表す。)
(2)
(式中、Ar4~Ar6は相互に同一でも異なってもよく、電子受容体基を置換基として有する芳香族炭化水素基、芳香族複素環基、または縮合多環芳香族基を表す。) - 前記正孔輸送層が、正孔輸送性のアリールアミン化合物を含有する、請求項1記載の有機エレクトロルミネッセンス素子。
- 前記正孔輸送層が、前記一般式(1)で表されるアリールアミン化合物を含有することを特徴とする、請求項1または2記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Ar1~Ar3が置換もしくは無置換の芳香族炭化水素基である請求項1~3のいずれか一項に記載の有機エレクトロルミネッセンス素子。
- 前記一般式(1)において、Ar1~Ar3が置換もしくは無置換のフェニル基、ビフェニリル基またはターフェニリル基である請求項1~4のいずれか一項に記載の有機エレクトロルミネッセンス素子。
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EP3605638A1 (en) | 2020-02-05 |
TW201840811A (zh) | 2018-11-16 |
JP7149263B2 (ja) | 2022-10-06 |
CN110326123A (zh) | 2019-10-11 |
KR20190128169A (ko) | 2019-11-15 |
KR102533036B1 (ko) | 2023-05-15 |
JPWO2018180215A1 (ja) | 2020-02-06 |
US20200013958A1 (en) | 2020-01-09 |
EP3605638B1 (en) | 2023-11-08 |
CN117677263A (zh) | 2024-03-08 |
US11925107B2 (en) | 2024-03-05 |
EP3605638A4 (en) | 2021-01-06 |
TWI750355B (zh) | 2021-12-21 |
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