WO2021177022A1 - 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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- WO2021177022A1 WO2021177022A1 PCT/JP2021/005693 JP2021005693W WO2021177022A1 WO 2021177022 A1 WO2021177022 A1 WO 2021177022A1 JP 2021005693 W JP2021005693 W JP 2021005693W WO 2021177022 A1 WO2021177022 A1 WO 2021177022A1
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- -1 triarylamine compound Chemical class 0.000 claims abstract description 145
- 230000005525 hole transport Effects 0.000 claims abstract description 56
- 150000001875 compounds Chemical class 0.000 claims description 124
- 125000001424 substituent group Chemical group 0.000 claims description 89
- 125000004432 carbon atom Chemical group C* 0.000 claims description 63
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 35
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims description 34
- 229910052717 sulfur Inorganic materials 0.000 claims description 30
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 26
- 125000004434 sulfur atom Chemical group 0.000 claims description 26
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 24
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 20
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 19
- 125000003342 alkenyl group Chemical group 0.000 claims description 15
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 15
- 125000003545 alkoxy group Chemical group 0.000 claims description 14
- 125000000217 alkyl group Chemical group 0.000 claims description 14
- 125000004104 aryloxy group Chemical group 0.000 claims description 13
- 125000000000 cycloalkoxy group Chemical group 0.000 claims description 11
- 125000003277 amino group Chemical group 0.000 claims description 10
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 10
- 238000005401 electroluminescence Methods 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- UFHFLCQGNIYNRP-VVKOMZTBSA-N Dideuterium Chemical group [2H][2H] UFHFLCQGNIYNRP-VVKOMZTBSA-N 0.000 claims description 7
- 150000001454 anthracenes Chemical class 0.000 claims description 7
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 7
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 7
- 229910052731 fluorine Inorganic materials 0.000 claims description 7
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 239000002019 doping agent Substances 0.000 claims description 6
- 125000001153 fluoro group Chemical group F* 0.000 claims description 6
- 125000005577 anthracene group Chemical group 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 229910052711 selenium Inorganic materials 0.000 claims description 4
- 125000005647 linker group Chemical group 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 76
- 238000002347 injection Methods 0.000 abstract description 29
- 239000007924 injection Substances 0.000 abstract description 29
- 239000010409 thin film Substances 0.000 abstract description 19
- 230000000903 blocking effect Effects 0.000 abstract description 17
- 239000000243 solution Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 146
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 39
- 238000000034 method Methods 0.000 description 29
- 238000002156 mixing Methods 0.000 description 25
- 150000001412 amines Chemical class 0.000 description 22
- 239000000843 powder Substances 0.000 description 22
- 239000010408 film Substances 0.000 description 19
- 239000012043 crude product Substances 0.000 description 18
- 238000007740 vapor deposition Methods 0.000 description 17
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000002356 single layer Substances 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000003786 synthesis reaction Methods 0.000 description 10
- 238000005160 1H NMR spectroscopy Methods 0.000 description 9
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 9
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 8
- 239000012046 mixed solvent Substances 0.000 description 8
- 125000001624 naphthyl group Chemical group 0.000 description 8
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 8
- 239000000758 substrate Substances 0.000 description 8
- BWHDROKFUHTORW-UHFFFAOYSA-N tritert-butylphosphane Chemical compound CC(C)(C)P(C(C)(C)C)C(C)(C)C BWHDROKFUHTORW-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000706 filtrate Substances 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 230000009477 glass transition Effects 0.000 description 7
- LXNAVEXFUKBNMK-UHFFFAOYSA-N palladium(II) acetate Substances [Pd].CC(O)=O.CC(O)=O LXNAVEXFUKBNMK-UHFFFAOYSA-N 0.000 description 7
- 238000004528 spin coating Methods 0.000 description 7
- FCEHBMOGCRZNNI-UHFFFAOYSA-N 1-benzothiophene Chemical compound C1=CC=C2SC=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 6
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 6
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 6
- 238000004440 column chromatography Methods 0.000 description 6
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 125000003118 aryl group Chemical group 0.000 description 5
- 150000001716 carbazoles Chemical group 0.000 description 5
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 5
- 150000002391 heterocyclic compounds Chemical class 0.000 description 5
- 125000001041 indolyl group Chemical group 0.000 description 5
- 125000001792 phenanthrenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C=CC12)* 0.000 description 5
- 125000003367 polycyclic group Chemical group 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 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 4
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 4
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 description 4
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 4
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 4
- 125000000499 benzofuranyl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 description 4
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 4
- 125000001164 benzothiazolyl group Chemical group S1C(=NC2=C1C=CC=C2)* 0.000 description 4
- 125000004196 benzothienyl group Chemical group S1C(=CC2=C1C=CC=C2)* 0.000 description 4
- 125000004541 benzoxazolyl group Chemical group O1C(=NC2=C1C=CC=C2)* 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 125000004988 dibenzothienyl group Chemical group C1(=CC=CC=2SC3=C(C21)C=CC=C3)* 0.000 description 4
- 125000003914 fluoranthenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC=C4C1=C23)* 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
- 125000003454 indenyl group Chemical group C1(C=CC2=CC=CC=C12)* 0.000 description 4
- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 4
- 125000005956 isoquinolyl group Chemical group 0.000 description 4
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 4
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 4
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 125000003226 pyrazolyl group Chemical group 0.000 description 4
- 125000001725 pyrenyl group Chemical group 0.000 description 4
- 125000004076 pyridyl group Chemical group 0.000 description 4
- 125000000168 pyrrolyl group Chemical group 0.000 description 4
- 150000004322 quinolinols Chemical class 0.000 description 4
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 4
- 125000001544 thienyl group Chemical group 0.000 description 4
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 description 4
- FOFSNCRMWLKAIM-UHFFFAOYSA-N 5-[4-(aminomethyl)-6-(trifluoromethyl)pyridin-2-yl]oxy-3,4-dihydro-1H-quinolin-2-one Chemical compound NCC1=CC(=NC(=C1)C(F)(F)F)OC1=C2CCC(NC2=CC=C1)=O FOFSNCRMWLKAIM-UHFFFAOYSA-N 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 3
- PKZVFOVXYKCBCJ-UHFFFAOYSA-N [2-(1H-indol-4-yloxy)-6-(trifluoromethyl)pyridin-4-yl]methanamine Chemical compound N1C=CC2=C(C=CC=C12)OC1=NC(=CC(=C1)CN)C(F)(F)F PKZVFOVXYKCBCJ-UHFFFAOYSA-N 0.000 description 3
- SAHIZENKTPRYSN-UHFFFAOYSA-N [2-[3-(phenoxymethyl)phenoxy]-6-(trifluoromethyl)pyridin-4-yl]methanamine Chemical compound O(C1=CC=CC=C1)CC=1C=C(OC2=NC(=CC(=C2)CN)C(F)(F)F)C=CC=1 SAHIZENKTPRYSN-UHFFFAOYSA-N 0.000 description 3
- 125000002178 anthracenyl group Chemical group C1(=CC=CC2=CC3=CC=CC=C3C=C12)* 0.000 description 3
- 150000004982 aromatic amines Chemical class 0.000 description 3
- 125000002102 aryl alkyloxo group Chemical group 0.000 description 3
- 150000001556 benzimidazoles Chemical class 0.000 description 3
- 125000000051 benzyloxy group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])O* 0.000 description 3
- 150000001721 carbon Chemical group 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 239000003480 eluent Substances 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 125000002541 furyl group Chemical group 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- 125000005842 heteroatom Chemical group 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 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
- 239000012044 organic layer Substances 0.000 description 3
- 125000004437 phosphorous atom Chemical group 0.000 description 3
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 3
- 150000003220 pyrenes Chemical class 0.000 description 3
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 3
- 125000005493 quinolyl group Chemical group 0.000 description 3
- 239000011669 selenium Substances 0.000 description 3
- 229930192474 thiophene Natural products 0.000 description 3
- 125000005259 triarylamine group Chemical group 0.000 description 3
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- 125000006617 triphenylamine group Chemical group 0.000 description 3
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
- BCMCBBGGLRIHSE-UHFFFAOYSA-N 1,3-benzoxazole Chemical compound C1=CC=C2OC=NC2=C1 BCMCBBGGLRIHSE-UHFFFAOYSA-N 0.000 description 2
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 2
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 2
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- 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
- 125000004974 2-butenyl group Chemical group C(C=CC)* 0.000 description 2
- 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 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
- 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
- RSQXKVWKJVUZDG-UHFFFAOYSA-N 9-bromophenanthrene Chemical compound C1=CC=C2C(Br)=CC3=CC=CC=C3C2=C1 RSQXKVWKJVUZDG-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- 101000837344 Homo sapiens T-cell leukemia translocation-altered gene protein Proteins 0.000 description 2
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 2
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 101710110702 Probable chorismate pyruvate-lyase 1 Proteins 0.000 description 2
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 102100028692 T-cell leukemia translocation-altered gene protein Human genes 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- HXGDTGSAIMULJN-UHFFFAOYSA-N acenaphthylene Chemical compound C1=CC(C=C2)=C3C2=CC=CC3=C1 HXGDTGSAIMULJN-UHFFFAOYSA-N 0.000 description 2
- 125000003670 adamantan-2-yl group Chemical group [H]C1([H])C(C2([H])[H])([H])C([H])([H])C3([H])C([*])([H])C1([H])C([H])([H])C2([H])C3([H])[H] 0.000 description 2
- ORILYTVJVMAKLC-UHFFFAOYSA-N adamantane Chemical compound C1C(C2)CC3CC1CC2C3 ORILYTVJVMAKLC-UHFFFAOYSA-N 0.000 description 2
- 229940058303 antinematodal benzimidazole derivative Drugs 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- RFRXIWQYSOIBDI-UHFFFAOYSA-N benzarone Chemical compound CCC=1OC2=CC=CC=C2C=1C(=O)C1=CC=C(O)C=C1 RFRXIWQYSOIBDI-UHFFFAOYSA-N 0.000 description 2
- HFACYLZERDEVSX-UHFFFAOYSA-N benzidine Chemical class C1=CC(N)=CC=C1C1=CC=C(N)C=C1 HFACYLZERDEVSX-UHFFFAOYSA-N 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
- 229910052792 caesium Inorganic materials 0.000 description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 2
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 229940125904 compound 1 Drugs 0.000 description 2
- 125000003113 cycloheptyloxy group Chemical group C1(CCCCCC1)O* 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 125000002933 cyclohexyloxy group Chemical group C1(CCCCC1)O* 0.000 description 2
- 125000004410 cyclooctyloxy group Chemical group C1(CCCCCCC1)O* 0.000 description 2
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 2
- 125000001887 cyclopentyloxy group Chemical group C1(CCCC1)O* 0.000 description 2
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- XEXYATIPBLUGSF-UHFFFAOYSA-N phenanthro[9,10-b]pyridine-2,3,4,5,6,7-hexacarbonitrile Chemical group N1=C(C#N)C(C#N)=C(C#N)C2=C(C(C#N)=C(C(C#N)=C3)C#N)C3=C(C=CC=C3)C3=C21 XEXYATIPBLUGSF-UHFFFAOYSA-N 0.000 description 1
- 150000005041 phenanthrolines Chemical class 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000005581 pyrene group Chemical group 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 150000003252 quinoxalines Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical class [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-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
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- BBCAQPYJVYMQFB-UHFFFAOYSA-N sodium;2-methylpropane Chemical compound [Na+].C[C-](C)C BBCAQPYJVYMQFB-UHFFFAOYSA-N 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000007736 thin film deposition technique Methods 0.000 description 1
- 125000004306 triazinyl group Chemical group 0.000 description 1
- 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 1
- 125000005580 triphenylene group Chemical group 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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Definitions
- the present invention relates to an organic electroluminescence device which is a self-luminous element suitable for various display devices, and more particularly, an organic electroluminescence device using a specific arylamine compound (hereinafter, abbreviated as an organic EL device). It is about.
- the organic EL element is a self-luminous element, it is brighter and has better visibility than the liquid crystal element, and can display clearly, so that active research has been conducted.
- Non-Patent Document 3 Devices that utilize thermally activated delayed fluorescence (TADF) emission have also been developed.
- TADF thermally activated delayed fluorescence
- the light emitting layer can also be prepared by doping a charge transporting compound generally called a host material with a fluorescent compound, a phosphorescent compound, or a material that emits delayed fluorescence.
- a charge transporting compound generally called a host material
- a fluorescent compound generally called a fluorescent compound
- a phosphorescent compound or a material that emits delayed fluorescence.
- the charges injected from both electrodes are recombined in the light emitting layer to obtain light emission, but it is important how efficiently both hole and electron charges are transferred to the light emitting layer. It is necessary to use an element with excellent carrier balance.
- the hole injection property and the electron blocking property that blocks the electrons injected from the cathode, the probability of recombination of holes and electrons is improved, and excitons generated in the light emitting layer are generated. High emission efficiency can be obtained by confining. Therefore, the role played by the hole transport material is important, and a hole transport material having high hole injection property, high hole mobility, high electron blocking property, and high electron durability is required. ing.
- the heat resistance and amorphous nature of the material are also important for the life of the device.
- thermal decomposition occurs even at a low temperature due to the heat generated when the element is driven, and the material deteriorates.
- the material used is required to have high heat resistance and good amorphous property.
- NPD N, N'-diphenyl-N, N'-di ( ⁇ -naphthyl) benzidine
- various aromatic amine derivatives are known.
- NPD has a good hole transporting ability
- the glass transition point (Tg) which is an index of heat resistance
- Tg glass transition point
- device characteristics deteriorate due to crystallization (for example).
- Patent Document 4 the aromatic amine derivatives described in the above patent documents, compounds having an excellent mobility of holes of 10 -3 cm 2 / Vs or more are known (for example, Patent Documents).
- Patent Document 2 because the electron blocking property is insufficient, some of the electrons pass through the light emitting layer, and improvement in light emitting efficiency cannot be expected. There has been a demand for a material having high properties, a thin film more stable, and high heat resistance. Further, although there is a report of a highly durable aromatic amine derivative (see, for example, Patent Document 3), it was used as a charge transport material used in an electrophotographic photosensitive member, and there was no example of using it as an organic EL element. ..
- Arylamine compounds having a substituted carbazole structure have been proposed as compounds having improved properties such as heat resistance and hole injection (see, for example, Patent Documents 4 and 5), and these compounds are injected into holes.
- the elements used for the layer or the hole transport layer have been improved in heat resistance and light emission efficiency, they are not yet sufficient, and further lower drive voltage and higher light emission efficiency are required. ..
- Japanese Unexamined Patent Publication No. 8-048656 Japanese Patent No. 3194657 Japanese Patent No. 4943840 Japanese Unexamined Patent Publication No. 2006-151979 International Publication No. 2008/62636 International Publication No. 2014/09310
- An object of the present invention is to provide a material for an organic EL device having excellent hole injection / transport performance, electron blocking ability, stability and durability in a thin film state, and further, the material and the hole and By combining various materials for organic EL devices, which are excellent in electron injection / transport performance, electron blocking ability, stability in thin film state, and durability, so that the characteristics of each material can be effectively exhibited.
- An object of the present invention is to provide an organic EL device having high efficiency, low drive voltage, and long life.
- the physical properties that the organic compound to be provided by the present invention should have are (1) good hole injection characteristics, (2) high hole mobility, and (3) electron blocking ability. It can be mentioned that it is excellent in (4) the thin film state is stable, and (5) it is excellent in heat resistance. Further, the physical characteristics that the organic EL element to be provided by the present invention should have are (1) high luminous efficiency and high power efficiency, (2) low luminous start voltage, and (3) practical drive. It can be mentioned that the voltage is low and (4) it has a long life.
- the present inventors have focused on the fact that a triarylamine compound having a specific structure is excellent in hole injection / transport ability, thin film stability and durability.
- Various triarylamine compounds were enthusiastically studied, and the characteristics of the produced organic EL device were evaluated.
- the present inventors have found that when a triarylamine compound having a specific structure is used as a material for a hole transport layer, holes injected from the anode side can be efficiently transported.
- various organic EL devices combined with a light emitting material having a specific structure and the like were produced, and the characteristics of the devices were evaluated. As a result, the present invention has been completed.
- the following organic EL elements are provided.
- the second hole transport At least one layer of the layer or the laminated film arranged between the first hole transport layer and the electron transport layer contains the triarylamine compound represented by the following general formula (1).
- a characteristic organic EL element In an organic EL device having at least a first hole transport layer, a second hole transport layer, a blue light emitting layer, and an electron transport layer in this order between the anode and the cathode from the anode side, the second hole transport At least one layer of the layer or the laminated film arranged between the first hole transport layer and the electron transport layer contains the triarylamine compound represented by the following general formula (1).
- a characteristic organic EL element A characteristic organic EL element.
- A, B and C may be the same or different from each other, and a monovalent group, substituted or unsubstituted aromatic hydrocarbon having a broken line portion represented by the following general formula (2-1) as a bonding site.
- all of A, B and C are simultaneously represented by the following general formula (2-1). It shall not be a monovalent group to be used.
- R is a linear or branched carbon atom having 1 to 6 carbon atoms which may have a heavy hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a nitro group, and a substituent.
- the Rs bonded to the same benzene ring may be the same or different from each other, and a single-bonded, substituted or unsubstituted methylene group, Rings may be formed by bonding with each other via an oxygen atom or a sulfur atom.
- L is a divalent group of a substituted or unsubstituted aromatic hydrocarbon, or a divalent group of a substituted or unsubstituted aromatic heterocycle. , Or a substituted or unsubstituted fused polycyclic aromatic divalent group, where m represents an integer of 1 to 3. Where m is 2 or 3, L may be the same or different from each other. Good.
- Ar 1 and Ar 2 may be the same or different from each other, and may be a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group. Represents a group.
- Q 1 ⁇ Q 3 may be the same or different, a substituted or unsubstituted aromatic hydrocarbon, a substituted or unsubstituted fused polycyclic aromatic or .
- R 5 and R 6 , and R 7 and R 8 are single-bonded, substituted or unsubstituted methylene between the respective groups. It may be bonded to each other via a group, an oxygen atom or a sulfur atom to form a ring.
- R 4 to R 8 are bonded to each other with adjacent Q 1 , Q 2 or Q 3 via a linking group such as a substituted or unsubstituted methylene group, oxygen atom, sulfur atom or monosubstituted amino group to form a ring. May be.
- Substituted or unsubstituted aromatic hydrocarbon group "substituted or unsubstituted aromatic heterocyclic group”, or “substituted or unsubstituted fused polycycle” represented by R in the general formula (2-1).
- Specific examples of the "aromatic hydrocarbon group”, “aromatic heterocyclic group”, or “condensed polycyclic aromatic group” in the “aromatic group” include a phenyl group, a biphenylyl group, a terphenylyl group, a naphthyl group, and anthrasenyl.
- each group may be bonded to the bonded benzene ring via a single bond, substituted or unsubstituted methylene group, oxygen atom or sulfur atom to form a ring.
- the "substituent" in the "substituted aromatic hydrocarbon group”, “substituted aromatic heterocyclic group”, or “substituted condensed polycyclic aromatic group” represented by R in the general formula (2-1) is Specifically, a heavy hydrogen atom, a cyano group, a nitro group; a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; a silyl group such as a trimethylsilyl group and a triphenylsilyl group; a methyl group, an ethyl group and a propyl group.
- substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, a substituted or unsubstituted amino group, an oxygen atom or a sulfur atom to form a ring.
- a linear or branched alkyl group having 1 to 6 carbon atoms which may have a substituent and “having a substituent” represented by R in the general formula (2-1).
- a "cycloalkyl group having 5 to 10 carbon atoms” or a “linear or branched alkenyl group having 2 to 6 carbon atoms which may have a substituent” has “1 to 6 carbon atoms”.
- a linear or branched alkyl group having 5 to 10 carbon atoms or "a linear or branched alkenyl group having 2 to 6 carbon atoms”
- Examples thereof include 1-adamantyl group, 2-adamantyl group, vinyl group, allyl group, isopropenyl group, 2-butenyl group and the like.
- each group may be bonded to the bonded benzene ring via a single bond, substituted or unsubstituted methylene group, oxygen atom or sulfur atom to form a ring.
- Linear or branched alkyl group having 1 to 6 carbon atoms having a substituent and “Cyclo having 5 to 10 carbon atoms having a substituent” represented by R in the general formula (2-1).
- Specific examples of the "substituent" in the “alkyl group” or “linear or branched alkenyl group having 2 to 6 carbon atoms having a substituent” include a heavy hydrogen atom, a cyano group, and a nitro group; fluorine.
- Halogen atoms such as atoms, chlorine atoms, bromine atoms and iodine atoms; silyl groups such as trimethylsilyl group and triphenylsilyl group; linear or linear groups having 1 to 6 carbon atoms such as methyloxy group, ethyloxy group and propyloxy group.
- alkyloxy group Branched alkyloxy group; alkenyl group such as vinyl group and allyl group; aryloxy group such as phenyloxy group and triloxy group; arylalkyloxy group such as benzyloxy group and phenethyloxy group; phenyl group, biphenylyl group, terphenylyl Aromatic hydrocarbon groups such as groups, naphthyl groups, anthracenyl groups, phenanthrenyl groups, fluorenyl groups, spirobifluorenyl groups, indenyl groups, pyrenyl groups, perylenel groups, fluoranthenyl groups, triphenylenyl groups or condensed polycyclic aromatic groups.
- Aromatic heterocyclic groups such as dibenzofuranyl group, dibenzothienyl group, carborinyl group and the like can be mentioned, and these substituents may be further substituted with the above-exemplified substituents.
- substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, a substituted or unsubstituted amino group, an oxygen atom or a sulfur atom to form a ring.
- a linear or branched alkyloxy group having 1 to 6 carbon atoms which may have a substituent represented by R in the general formula (2-1), or “having a substituent”
- Cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group, 1-adamantyloxy group, 2-adamantyloxy group and the like When a plurality of these groups are bonded to the same benzene ring, even if they are bonded to each other via a single bond, substituted or unsubstituted methylene group, oxygen atom or sulfur atom to form a ring.
- each group may be bonded to the bonded benzene ring via a single bond, substituted or unsubstituted methylene group, oxygen atom or sulfur atom to form a ring.
- Linear or branched alkyloxy group having 1 to 6 carbon atoms having a substituent represented by R in the general formula (2-1), or "5 to 10 carbon atoms having a substituent”
- substituents in the "cycloalkyloxy group” include a heavy hydrogen atom, a cyano group, a nitro group; a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom; a trimethylsilyl group and a triphenylsilyl group.
- Cyril groups such as groups; linear or branched alkyloxy groups having 1 to 6 carbon atoms such as methyloxy groups, ethyloxy groups and propyloxy groups; alkenyl groups such as vinyl groups and allyl groups; phenyloxy groups, Aryloxy groups such as trilyoxy groups; arylalkyloxy groups such as benzyloxy groups and phenethyloxy groups; phenyl groups, biphenylyl groups, terphenylyl groups, naphthyl groups, anthracenyl groups, phenanthrenyl groups, fluorenyl groups, spirobifluorenyl groups, Aromatic hydrocarbon groups such as indenyl group, pyrenyl group, perylenyl group, fluoranthenyl group, triphenylenyl group or condensed polycyclic aromatic group; pyridyl group, thienyl group, furyl group, pyrrolyl group, quinolyl group, is
- substituents may be further substituted with the above-exemplified substituents. Further, these substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, a substituted or unsubstituted amino group, an oxygen atom or a sulfur atom to form a ring.
- aryloxy group in the "substituted or unsubstituted aryloxy group” represented by R in the general formula (2-1) include a phenyloxy group, a biphenylyloxy group, and a terphenylyloxy. Examples thereof include a group, a naphthyloxy group, an anthracenyloxy group, a phenylanthrenyloxy group, a fluorenyloxy group, an indenyloxy group, a pyrenyloxy group, a peryleneyloxy group and the like.
- each group may be bonded to the bonded benzene ring via a single bond, substituted or unsubstituted methylene group, oxygen atom or sulfur atom to form a ring.
- the "substituent” in the "substituted aryloxy group” represented by R in the general formula (2-1) is a "substituted aromatic hydrocarbon group” represented by R in the general formula (2-1).
- “Substituted aromatic heterocyclic groups”, or the same as those shown as “substituents” in “substituted fused polycyclic aromatic groups” these substituents are single-bonded, substituted or It may be bonded to each other via an unsubstituted methylene group, a substituted or unsubstituted amino group, an oxygen atom or a sulfur atom to form a ring.
- Substituted or unsubstituted aromatic hydrocarbon group "substituted or unsubstituted aromatic heterocyclic group", or “substituted or unsubstituted aromatic heterocyclic group” represented by Ar 1 and Ar 2 in the general formula (2-1).
- the "aromatic hydrocarbon group”, “aromatic heterocyclic group”, or “condensed polycyclic aromatic group” in the “condensed polycyclic aromatic group” is represented by R in the general formula (2-1).
- Aromatic hydrocarbon group in “substituted or unsubstituted aromatic hydrocarbon group”, “substituted or unsubstituted aromatic heterocyclic group”, or “substituted or unsubstituted condensed polycyclic aromatic group” , "Aromatic heterocyclic groups”, or similar to those shown as “condensed polycyclic aromatic groups”.
- Substituted or unsubstituted aromatic hydrocarbon group "substituted or unsubstituted aromatic heterocyclic group", or “substituted or unsubstituted aromatic group” represented by A, B and C in the general formula (1).
- the "aromatic hydrocarbon group”, “aromatic heterocyclic group”, or “condensed polycyclic aromatic group” in the “polycyclic aromatic group” is represented by R in the general formula (2-1).
- Aromamatic hydrocarbon groups in “substituted or unsubstituted aromatic hydrocarbon groups", “substituted or unsubstituted aromatic heterocyclic groups", or “substituted or unsubstituted condensed polycyclic aromatic groups", " Examples thereof include those shown as “aromatic heterocyclic groups” or “condensed polycyclic aromatic groups”.
- substituents in a "substituted aromatic hydrocarbon group”, a “substituted aromatic heterocyclic group”, or a “substituted condensed polycyclic aromatic group” represented by A, B, and C in the general formula (1).
- substituents may be bonded to each other via a single bond, a substituted or unsubstituted methylene group, a substituted or unsubstituted amino group, an oxygen atom or a sulfur atom. It may form a ring.
- Substituted or unsubstituted aromatic hydrocarbons "substituted or unsubstituted aromatic heterocycles", or “substituted or unsubstituted fused polycyclic aromatics” in “divalent groups of unsubstituted condensed polycyclic aromatics”
- aromatic hydrocarbons “aromatic heterocycles”, or “condensed polycyclic aromatics” specifically, benzene, biphenyl, terphenyl, tetrakisphenyl, styrene, naphthalene, anthracene, acenaphthalene, etc.
- the "divalent group of the substituted or unsubstituted aromatic hydrocarbon” represented by L in the general formula (2-1), the "divalent group of the substituted or unsubstituted aromatic heterocycle", or the “divalent group of the substituted or unsubstituted aromatic heterocycle", or " The substituted or unsubstituted fused polycyclic aromatic divalent group can be obtained by removing two hydrogen atoms from the above-mentioned "aromatic hydrocarbon", "aromatic heterocycle", or "condensed polycyclic aromatic" 2 Represents a price group.
- the "substituent” in “" the "substituted aromatic hydrocarbon group” represented by R in the general formula (2-1), the "substituted aromatic heterocyclic group", or the "substituted fused polycyclic aromatic group”.
- substituents are single-bonded, substituted or unsubstituted methylene groups, substituted or unsubstituted amino groups, oxygen atoms or sulfur atoms. They may be bonded to each other to form a ring.
- At least one of A, B and C is preferably a monovalent group represented by the general formula (2-1).
- the monovalent group represented by the general formula (2-1) is a monovalent group represented by the general formula (2-2).
- it is a monovalent group represented by the general formula (2-3), and further preferably a monovalent group represented by the general formula (2-4).
- Ar 1 or / and Ar 2 in the general formulas (2-1) to (2-4) are "substituted or unsubstituted aromatic hydrocarbon groups”.
- a "substituted or unsubstituted condensed polycyclic aromatic group” more preferably a substituted or unsubstituted phenyl group, a naphthyl group, or a biphenylyl group, and an unsubstituted phenyl group, or It is more preferably a naphthyl group.
- L in the general formulas (2-1) to (2-2) is "divalent group of unsubstituted aromatic hydrocarbon" and "unsubstituted aromatic hydrocarbon". It is preferable that it is a “divalent group of an aromatic heterocyclic ring” or a “divalent group of an unsubstituted fused polycyclic aromatic ring”. Then, it is preferable that it is a divalent group formed by removing two hydrogen atoms from the "aromatic hydrocarbon” or “condensed polycyclic aromatic", and it can be formed by removing two hydrogen atoms from the "aromatic hydrocarbon”. It is more preferably a divalent group, and further preferably a divalent group (phenylene group) formed by removing two hydrogen atoms from benzene.
- the number n of the substituents R in the general formula (2-1) is preferably zero (0), that is, it does not have the substituent R.
- the number m of the divalent group L in the general formula (2-1) is preferably 1 or 2.
- Phenantren pyridine, pyrimidine, triazine, pyrrol, furan, thiophene, quinoline, isoquinoline, inden, benzofuran, benzothiophene, indol, indolin, carbazole, carboline, benzoxazole, benzothiazole, quinoxalin, benzoimidazole, pyrazole, dibenzofuran, dibenzo Examples include thiophene, naphthylidine, phenanthroline, and acrydin.
- these may have a substituent, and as the substituent, a "substituted aromatic hydrocarbon group” represented by R in the general formula (2-1), a “substituted aromatic heterocyclic group", etc.
- R a substituent
- 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.
- B is defined as a boron atom
- P is a phosphorus atom
- the general formula (3-1) and the general formula (3-2) Y 1 ⁇ Y 3 in may be the same or different from each other, N-R 4, CR 5 R 6, O, S, Se or SiR 7 it is any one selected from among R 8.
- N-R 4 is a nitrogen atom having R 4 as a substituent
- CR 5 R 6 is a carbon atom having R 5 and R 6 as a substituent
- O is an oxygen atom
- S is a sulfur atom
- Se is a selenium atom
- SiR. 7 R 8 is defined as a silicon atom having R 7 and R 8 as substituents.
- R 4 to R 8 are adjacent Q 1 , Q 2 or Q 3 , respectively, that is, Q 1 and Y 2 when Y 1 is N-R 4 , CR 5 R 6 , or SiR 7 R 8. and There N-R 4, CR 5 R 6 or SiR 7 Q 2 or Q 3 are the case of R 8,, Y 3 is a Q 3 are the case of N-R 4, CR 5 R 6 or SiR 7 R 8, , Each may be bonded to each other via a linking group such as a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or a monosubstituted amino group to form a ring.
- a linking group such as a substituted or unsubstituted methylene group, an oxygen atom, a sulfur atom, or a monosubstituted amino group to form a ring.
- R 5 and R 6 and R 7 and R 8 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.
- R 4 ⁇ R 8 is described in detail further in the description below.
- Y 1 to Y 3 in the general formula (3-1) and the general formula (3-2) are N-R 4 , CR 5 R 6 , or SiR 7 R 8 , they are represented by R 4 to R 8.
- a linear or branched alkyl group having 1 to 6 carbon atoms or “carbon” in "a linear or branched alkenyl group having 2 to 6 carbon atoms which may have a substituent”.
- cycloalkyl group having 5 to 10 atoms or the “linear or branched alkenyl group having 2 to 6 carbon atoms” include a methyl group, an ethyl group, an n-propyl group and an isopropyl group.
- N-butyl group isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, cyclopentyl group, cyclohexyl group, 1-adamantyl group, 2-adamantyl group, vinyl group, allyl
- Examples include a group, an isopropenyl group, a 2-butenyl group and the like.
- substituents may have a substituent, and as the substituent, "a linear or branched form having a substituent and having 1 to 6 carbon atoms" represented by R in the general formula (2-1).
- R a substituent represented by R in the general formula (2-1).
- Alkyl group “Cycloalkyl group having 5 to 10 carbon atoms having a substituent”
- Linear or branched alkenyl group having 2 to 6 carbon atoms having a substituent The same as those shown as can be given.
- Y 1 to Y 3 in the general formula (3-1) and the general formula (3-2) are N-R 4 , CR 5 R 6 , or SiR 7 R 8 , they are represented by R 4 to R 8.
- Specific examples of the "linear or branched alkyloxy group having 1 to 6 carbon atoms” or “cycloalkyloxy group having 5 to 10 carbon atoms" in the "group” include a methyloxy group and an ethyloxy group.
- N-propyloxy group isopropyloxy group, n-butyloxy group, tert-butyloxy group, n-pentyloxy group, n-hexyloxy group, cyclopentyloxy group, cyclohexyloxy group, cycloheptyloxy group, cyclooctyloxy group , 1-adamantyloxy group, 2-adamantyloxy group and the like can be mentioned.
- these groups may have a substituent, and as the substituent, a linear group having 1 to 6 carbon atoms having a substituent or represented by R in the general formula (2-1) or Examples thereof include those shown as “substituents” in “branched alkyloxy groups” or “cycloalkyloxy groups having 5 to 10 carbon atoms having substituents”.
- Y 1 to Y 3 in the general formula (3-1) and the general formula (3-2) are N-R 4 , CR 5 R 6 , or SiR 7 R 8 , they are represented by R 4 to R 8.
- R 4 to R 8 Specific examples of the "aromatic hydrocarbon group” or “condensed polycyclic aromatic group” in the “substituted or unsubstituted aromatic hydrocarbon group” or the “substituted or unsubstituted condensed polycyclic aromatic group” are specific. Examples thereof include a phenyl group, a biphenylyl group, a terphenylyl group, a naphthyl group, an anthrasenyl group, and a phenanthrenyl group.
- these groups may have a substituent, and as the substituent, a "substituted aromatic hydrocarbon group” represented by R in the general formula (2-1) and a “substituted aromatic heterocyclic group”. , Or the same as those shown as the "substituent” in the "substituted fused polycyclic aromatic group”.
- Y 1 to Y 3 in the general formula (3-1) and the general formula (3-2) are N-R 4 , CR 5 R 6 , or Si-R 7 R 8 , they are represented by R 4 to R 8 .
- Specific examples of the "aryloxy group" in the "substituted or unsubstituted aryloxy group” include a phenyloxy group, a biphenylyloxy group, a terphenylyloxy group, a naphthyloxy group, and an anthracenyloxy group. Examples thereof include a phenylenyloxy group, a fluorenyloxy group, an indenyloxy group, a pyrenyloxy group, and a perylenyloxy group.
- these groups may have a substituent, and as the substituent, a "substituted aromatic hydrocarbon group” represented by R in the general formula (2-1) and a “substituted aromatic heterocyclic group”. , Or the same as those shown as the "substituent” in the "substituted fused polycyclic aromatic group”.
- the "aromatic hydrocarbon", “condensed polycyclic aromatic” or “aromatic heterocycle” in the “unsubstituted aromatic heterocycle” includes benzene, naphthalene, phenanthrene, pyridine, pyrimidine, inden, benzofuran and benzothiophene. , Indol is preferable, and benzene and naphthalene are more preferable.
- R 4 to R 8 are substituents. It has a linear or branched alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 5 to 10 carbon atoms which may have a substituent, and a substituent.
- a linear or branched alkenyl group having 2 to 6 carbon atoms, a linear or branched alkyloxy group having 1 to 6 carbon atoms which may have a substituent, and a substituent may be used.
- R 4 is a linear or branched alkyl group having 1-6 good 1 carbon atoms which may have a substituent, to 5 carbon atoms which may have a substituent 10
- the Y 1, N-R 4, O, S is preferably, O, S being more preferred.
- at least one of the Y 2 and Y 3 is preferably N-R 4, both are N-R 4 Is more preferable.
- the R 4, "substituted or unsubstituted aromatic hydrocarbon group", or “substituted or unsubstituted condensed polycyclic aromatic group” is preferable, a substituted or unsubstituted phenyl group, biphenylyl group, terphenylyl group, a naphthyl Groups are more preferred.
- the triarylamine compound represented by the general formula (1) according to the present invention has (1) good hole injection characteristics, (2) high hole mobility, and (3) excellent electron blocking ability. (4) The thin film state is stable, and (5) It has excellent heat resistance. Therefore, it is used as a constituent material of the hole transport layer of the organic EL device of the present invention. Is preferable.
- the organic EL device of the present invention using the triarylamine compound represented by the general formula (1) according to the present invention as a constituent material of the hole transport layer has higher hole mobility than the conventional hole transport material.
- the element can be realized.
- the hole transport layer has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer located on the light emitting layer side is described by the general formula (1). ),
- the electron blocking performance of the triarylamine compound can be fully utilized, and a more efficient and long-life organic EL device can be realized.
- the organic EL device of the present invention using the triarylamine compound represented by is used as a constituent material thereof has high efficiency because it uses a triarylamine compound having excellent amorphous properties and a stable thin film state. It is possible to realize an organic EL element having a low drive voltage and a long life.
- the triarylamine compound represented by the general formula (1) it is a figure which shows the structural formula of the compound 1-1-12. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-13 to 1-24. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-25 to 1-36. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-37 to 1-48. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-49-1-60.
- the triarylamine compound represented by the general formula (1) it is a figure which shows the structural formula of the compound 1-61 to 1-72. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-73 to 1-84. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-85 to 1-95. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-96 to 1-107. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-108 to 1-119.
- the triarylamine compound represented by the general formula (1) it is a figure which shows the structural formula of the compound 1-120 to 1-131. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-132 to 1-142. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-143 to 1-154. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-155 to 1-166. As an example of the triarylamine compound represented by the general formula (1), it is a figure which shows the structural formula of the compound 1-167 to 1-178.
- the triarylamine compound represented by the general formula (1) it is a figure which shows the structural formula of the compound 1-179 to 1-190.
- the triarylamine compound represented by the general formula (1) it is a figure which shows the structural formula of the compound 1-191 to 1-21.
- the compound represented by the general formula (3-1) it is a figure which shows the structure of the compound 3-1-1 to 3-1-9.
- the compound represented by the general formula (3-1) it is a figure which shows the structural formula of the compound 3-1-10 to 3-1-24.
- the compound represented by the general formula (3-2) it is a figure which shows the structure of the compound 3-2-1 to 3-2-6. It is a figure which shows an example of the organic EL element structure of this invention.
- triarylamine compounds represented by the general formula (1) which are preferably used for the organic EL device of the present invention
- specific examples of preferable compounds are shown in FIGS. 1 to 17, but are limited to these compounds. It is not something that is done.
- the triarylamine compound represented by the general formula (1) was purified by a column chromatograph, adsorption purification using silica gel, activated carbon, activated clay, etc., recrystallization and crystallization method using a solvent, sublimation purification method, and the like.
- the compounds were identified by NMR analysis.
- the glass transition point (Tg) and the work function were measured.
- the glass transition point (Tg) is an index of stability in the 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 with silica gel, activated charcoal, activated white clay, etc., recrystallization with a solvent, crystallization method, etc., and finally sublimation.
- the one purified by the purification method was used.
- the glass transition point (Tg) was measured with a high-sensitivity differential scanning calorimeter (DSC3100SA, manufactured by Bruker AXS) using powder.
- the work function was obtained by forming a 100 nm thin film on an ITO substrate and using an ionization potential measuring device (PYS-202, manufactured by Sumitomo Heavy Industries, Ltd.).
- the structure of the organic EL element of the present invention includes an anode, a hole transport layer, a light emitting layer, an electron transport layer and a cathode in order on the substrate, and holes are injected between the anode and the hole transport layer.
- Examples thereof include those having a layer, 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 anode.
- the hole transport layer preferably has a two-layer structure of a first hole transport layer and a second hole transport layer, and the second hole transport layer in this case is a light emitting layer. It is preferably adjacent to, in which case it can function as an electron blocking layer.
- an electrode material having a large work function such as ITO or gold is used.
- hole injection layer of the organic EL element of the present invention materials such as starburst type triphenylamine derivatives and various triphenylamine tetramers; porphyrin compounds typified by copper phthalocyanine; acceptors such as hexacyanoazatriphenylene.
- a sex heterocyclic compound, a coating type polymer material, or the like can be used.
- these materials can be thin-filmed by a known method such as a spin coating method or an inkjet method.
- the triarylamine compound represented by the general formula (1) is used.
- a hole-transporting material that can be mixed or used simultaneously with the triarylamine compound represented by the general formula (1).
- N, N'-diphenyl-N, N'-di (m-tolyl) benzidine Benzidine derivatives such as TPD
- N, N, N', N'-tetrabiphenylyl benzidine 1,1-bis [4- (Di-4-trilamino) phenyl]
- TAPC cyclohexane
- an arylamine compound having a structure in which four triphenylamine structures are linked in a molecule with a divalent group containing no single bond or hetero atom an arylamine compound having a structure in which four triphenylamine structures are linked in a molecule with a divalent group containing
- organic amine compounds such as various triphenylamine derivatives such as arylamine compounds having a structure in which two triphenylamine structures are linked in a molecule with a single bond or a divalent group containing no heteroatom can be used.
- triphenylamine derivatives such as arylamine compounds having a structure in which two triphenylamine structures are linked in a molecule with a single bond or a divalent group containing no heteroatom
- These materials can be thin-film formed by a known method such as a spin coating method or an inkjet method in addition to a thin film deposition method.
- a material usually used for the layer is further P-doped with trisbromophenylamine hexachloroantimony, a radialene derivative (see, for example, Patent Document 6) or the like.
- a polymer compound having the structure of a benzidine derivative such as TPD in its partial structure can be used.
- the hole transport layer of the organic EL device of the present invention has a two-layer structure of a first hole transport layer and a second hole transport layer
- the second hole transport layer located on the light emitting layer side is generally described above.
- a triarylamine compound represented by the formula (1) is used.
- Examples of the hole-transporting material that can be mixed or used simultaneously with the triarylamine compound represented by the general formula (1) include 4,4', 4''-tri (N-carbazolyl) triphenylamine (TCTA).
- these may be formed alone, or may be used as a single layer formed by mixing with other materials, and may be used as a single layer formed by themselves, layers formed by mixing, or layers formed by mixing. It may be a laminated structure of a layer formed by mixing with a layer formed alone.
- these materials can be thin-filmed by a known method such as a spin coating method or an inkjet method.
- the compound represented by the general formula (3-1) or the general formula (3-2) is preferably used.
- various metal complexes, anthracene derivatives, bisstyrylbenzene derivatives, pyrene derivatives, oxazole derivatives, polyparaphenylene vinylene derivatives and the like can be used.
- the light emitting layer may be composed of a host material and a dopant material.
- an anthracene derivative having an anthracene skeleton in the molecule is preferably used as the host material, but in addition, various metal complexes and bisstyrylbenzene are used.
- Derivatives, pyrene derivatives, oxazole derivatives, polyparaphenylene vinylene derivatives, heterocyclic compounds having an indol ring as a partial structure of the fused ring, heterocyclic compounds having a carbazole ring as a partial structure of the fused ring, carbazole derivatives, thiazole derivatives, benzimidazole Derivatives, polydialkylfluorene derivatives and the like can be used.
- the compound represented by the general formula (3-1) or the general formula (3-2) is preferably used, but in addition, a pyrene derivative having a pyrene skeleton in the molecule and an indole ring are condensed.
- a heterocyclic compound having a partial structure of the ring a heterocyclic compound having a carbazole ring as a partial structure of the fused ring, a carbazole derivative, a thiazole derivative, a benzimidazole derivative, a polydialkylfluorene derivative, quinacridone, coumarin, rubrene, perylene, and theirs.
- Derivatives benzopyran derivatives, indenophenanthrene derivatives, rhodamine derivatives, aminostyryl 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 materials, and may be used as a single layer formed by themselves, layers formed by mixing, or layers formed by mixing. It may be a laminated structure of a layer formed by mixing with a layer formed alone.
- a phosphorescent light emitter As the phosphorescent body, a phosphorescent body of a metal complex such as iridium or platinum can be used. A green phosphorescent body such as Ir (ppy) 3 , a blue phosphorescent body such as Firpic and Fir6, and a red phosphorescent body such as Btp 2 Ir (acac) are used, and the host material at this time is a molecule. An anthracene derivative having an anthracene skeleton inside is preferably used.
- carbazole derivatives such as 4,4'-di (N-carbazolyl) biphenyl (CBP), TCTA, and mCP can be used as the hole injecting / transporting host material.
- CBP 4,4'-di (N-carbazolyl) biphenyl
- TCTA 4,4'-di (N-carbazolyl) biphenyl
- mCP mCP
- electron-transporting host materials p-bis (triphenylsilyl) benzene (UGH2) and 2,2', 2''-(1,3,5-phenylene) -tris (1-phenyl-1H-benzimidazole) ) (TPBI) and the like can be used, and a high-performance organic EL element can be manufactured.
- Doping of the phosphorescent luminescent material to the host material is preferably done by co-depositing in the range of 1 to 30% by weight with respect to the entire light emitting layer in order to avoid concentration quenching.
- Non-Patent Document 3 a material that emits delayed fluorescence such as a CDCB derivative such as PIC-TRZ, CC2TA, PXZ-TRZ, 4CzIPN as a light emitting material.
- a material that emits delayed fluorescence such as a CDCB derivative such as PIC-TRZ, CC2TA, PXZ-TRZ, 4CzIPN.
- These materials can be thin-film formed by a known method such as a spin coating method or an inkjet method in addition to the vapor deposition method.
- a phenanthroline derivative such as bathocuproine (BCP) and a quinolinol derivative such as aluminum (III) bis (2-methyl-8-quinolinate) -4-phenylphenolate (BAlq)
- BCP bathocuproine
- BAlq quinolinol derivative
- compounds having a hole-blocking action such as various rare earth complexes, triazole derivatives, triazine derivatives, and oxaziazole derivatives can be used.
- These materials may also serve as materials for the electron transport layer. These may be formed alone, or may be used as a single layer formed by mixing with other materials, and may be used as a single layer formed by themselves, layers formed by mixing, or layers formed by mixing. It may be a laminated structure of a layer formed by mixing with a layer formed alone.
- these materials can be thin-filmed by a known method such as a spin coating method or an inkjet method.
- metal complexes of quinolinol derivatives such as Alq 3 and BAlq, various metal complexes, triazole derivatives, triazine derivatives, oxadiazole derivatives, pyridine derivatives, pyrimidine derivatives, benzimidazole derivatives , Thiasiazol derivative, anthracene derivative, carbodiimide derivative, quinoxaline derivative, pyridoindole derivative, phenanthroline derivative, silol derivative and the like can be used. These may be formed alone, or may be used as a single layer formed by mixing with other materials, and may be used as a single layer formed by themselves, layers formed by mixing, or layers formed by mixing. It may be a laminated structure of a layer formed by mixing with a layer formed alone. In addition to the vapor deposition method, these materials can be thin-filmed by a known method such as a spin coating method or an inkjet method.
- alkali metal salts such as lithium fluoride and cesium fluoride
- alkaline earth metal salts such as magnesium fluoride
- metal complexes of quinolinol derivatives such as lithium quinolinol, aluminum oxide and the like.
- Metal oxides or metals such as ytterbium (Yb), samarium (Sm), calcium (Ca), strontium (Sr), cesium (Cs) can be used, but in the preferred selection of electron transport layer and cathode. , This can be omitted.
- a material usually used for the layer which is further N-doped with a metal such as cesium, can be used.
- an electrode material having a low work function such as aluminum and an alloy having a lower work function such as magnesium silver alloy, magnesium indium alloy and aluminum magnesium alloy are used as the electrode material.
- an arylamine compound having a structure in which 2 to 6 triphenylamine structures are linked in a molecule and a divalent group containing no single bond or a hetero atom, and a benzoazole ring structure are provided. It is preferable to use an amine compound having an amine compound, an amine compound having an aromatic heterocyclic group in the molecule, or the like. These may be formed alone, or may be used as a single layer formed by mixing different materials, or may be used as a single layer formed by mixing, a layer formed by mixing, or a layer formed by mixing. It may be a laminated structure of a layer formed by mixing with a layer formed alone. In addition to the vapor deposition method, these materials can be thin-filmed by a known method such as a spin coating method or an inkjet method.
- the glass transition point (Tg) of the triarylamine compound represented by the general formula (1) was measured by a high-sensitivity differential scanning calorimeter (DSC3100SA, manufactured by Bruker AXS). The measurement results are shown below.
- Glass transition point (Tg) Compound of Example 1 107.1 ° C.
- Compound of Example 2 131.2 ° C.
- Compound of Example 3 129.7 ° C.
- Compound of Example 4 110.0 ° C.
- Compound of Example 5 127.9 ° C.
- Compound of Example 6 121.4 ° C.
- Compound of Example 7 109.5 ° C.
- Compound of Example 8 136.2 ° C.
- Compound of Example 9 116.1 ° C.
- the triarylamine compound represented by the general formula (1) has a glass transition point (Tg) of 100 ° C. or higher, indicating that the thin film state is stable.
- the triarylamine compound represented by the general formula (1) shows a suitable energy level as compared with the work function of 5.4 eV possessed by general hole transport materials such as NPD and TPD, which is good. It can be seen that it has a hole transporting ability and an excellent electron blocking ability.
- the organic EL element has a hole injection layer 3, a first hole transport layer 4, and a second hole on a glass substrate 1 on which a reflective ITO electrode is previously formed as a transparent anode 2.
- the transport layer 5, the light emitting layer 6, the electron transport layer 7, the electron injection layer 8, the cathode 9, and the capping layer 10 were vapor-deposited in this order.
- an ITO having a film thickness of 50 nm, a silver alloy reflective film having a film thickness of 100 nm, and an ITO having a film thickness of 5 nm are formed in this order, and ultrasonically washed in isopropyl alcohol.
- isopropyl alcohol was carried out for 20 minutes, and then dried on a hot plate heated to 250 ° C. for 10 minutes.
- the glass substrate with ITO was mounted in a vacuum vapor deposition machine and the pressure was reduced to 0.001 Pa or less.
- an electron acceptor (Acceptor-1) having the following structural formula and a compound (HTM-1) having the following structural formula were used as the hole injection layer 3 so as to cover the transparent anode 2, and the vapor deposition rate ratio was Acceptor-1: compound.
- a compound (HTM-1) having the following structural formula was formed as the first hole transport layer 4 on the hole injection layer 3 so as to have a film thickness of 140 nm.
- the compound (1-4) of Example 1 was formed as the second hole transport layer 5 so as to have a film thickness of 5 nm.
- the compound (3-1-11) of Example 6 and the compound (EMH-1) having the following structural formula are used as the light emitting layer 6, and the vapor deposition rate ratio is the compound (3-1).
- -11): Two-way vapor deposition was performed at a vapor deposition rate of compound (EMH-1) 5:95 to form a film having a film thickness of 20 nm.
- a compound (ETM-1) having the following structural formula and a compound (ETM-2) having the following structural formula are placed on the light emitting layer 6 as the electron transport layer 7, and the vapor deposition rate ratio is compound (ETM-1): compound (ETM). -2)
- Two-way vapor deposition was performed at a vapor deposition rate of 50:50, and the film was formed so as to have a film thickness of 30 nm.
- Lithium fluoride was formed on the electron transport layer 7 as an electron injection layer 8 so as to have a film thickness of 1 nm.
- a magnesium-silver alloy was formed on the electron injection layer 8 as a cathode 9 so as to have a film thickness of 12 nm.
- CPL-1 having the following structural formula was formed as the capping layer 10 so as to have a film thickness of 60 nm.
- the light emission characteristics of the produced organic EL device were measured by applying a DC voltage in the atmosphere at room temperature. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-58) of Example 2 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-59) of Example 3 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-69) of Example 4 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-83) of Example 5 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-108) of Example 6 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-112) of Example 7 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-145) of Example 8 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 13 the organic EL under the same conditions except that the compound (1-174) of Example 9 was used instead of the compound (1-4) of Example 1 as the material of the second hole transport layer 5. The element was manufactured. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 1 For comparison, the same applies to Example 13 except that the compound (HTM-2) having the following structural formula was used in place of the compound (1-4) of Example 1 as the material of the second hole transport layer 5.
- An organic EL device was manufactured under the conditions of. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- Example 2 For comparison, the same applies to Example 13 except that the compound (HTM-3) having the following structural formula was used in place of the compound (1-4) of Example 1 as the material of the second hole transport layer 5.
- An organic EL device was manufactured under the conditions of. The light emission characteristics of the produced organic EL device when a DC voltage was applied in the atmosphere at room temperature were measured. The results are summarized in Table 1.
- the device life was measured using the organic EL devices produced in Examples and Comparative Examples. The results are summarized in Table 1.
- the element life is equivalent to 95% when the emission brightness (initial brightness) at the start of light emission is 2000 cd / m 2 and the constant current drive is performed, and the emission brightness is 1900 cd / m 2 (when the initial brightness is 100%). It was defined as the time until it decayed to 95% decay).
- the luminous efficiency when a current having a current density of 10 mA / cm 2 was applied was 9.42 to 8.97 cd / A in Comparative Examples 1 and 2 and 9.
- the efficiency was clearly high at 57 to 10.52 cd / A.
- it was clearly high efficiency of 8.83 to 9.75 lm / W in Examples 13 to 21 as opposed to 6.75 to 8.19 lm / W in Comparative Examples 1 and 2.
- the element life (95% attenuation) was significantly extended from 223 to 245 hours in Comparative Examples 1 and 2 to 303 to 645 hours in Examples 13 to 21.
- the triarylamine compound having a specific structure represented by the general formula (1) has a hole mobility as compared with the conventional triarylamine compound used in the device of the comparative example. Since the organic EL device used together with the material used for the light emitting layer of the present invention has a high degree and an excellent electron blocking ability, the organic EL device has higher light emission efficiency than the conventional organic EL device. It can be seen that an organic EL element having a long life can be realized.
- the organic EL device using the triarylamine compound having a specific structure of the present invention can improve the luminous efficiency and the durability of the organic EL device as compared with the conventional organic EL device. For example, it can be applied to home 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、本発明が提供しようとする有機EL素子が具備すべき物理的な特性としては、(1)発光効率および電力効率が高いこと、(2)発光開始電圧が低いこと、(3)実用駆動電圧が低いこと、(4)長寿命であること、をあげることができる。
また、これらの基が同一のベンゼン環に複数個結合している場合は、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く、それぞれの基が結合しているベンゼン環と単結合、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結合して環を形成してもよい。
また、これらの置換基が単結合、置換もしくは無置換のメチレン基、置換もしくは無置換のアミノ基、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。
また、これらの基が同一のベンゼン環に複数個結合している場合は、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く、それぞれの基が結合しているベンゼン環と単結合、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結合して環を形成してもよい。
また、これらの置換基が単結合、置換もしくは無置換のメチレン基、置換もしくは無置換のアミノ基、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。
また、これらの基が同一のベンゼン環に複数個結合している場合は、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く、それぞれの基が結合しているベンゼン環と単結合、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結合して環を形成してもよい。
また、これらの置換基が単結合、置換もしくは無置換のメチレン基、置換もしくは無置換のアミノ基、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。
また、これらの基が同一のベンゼン環に複数個結合している場合は、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く、それぞれの基が結合しているベンゼン環と単結合、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結合して環を形成してもよい。
そして、一般式(2-1)中のLで表される「置換もしくは無置換の芳香族炭化水素の2価基」、「置換もしくは無置換の芳香族複素環の2価基」、または「置換もしくは無置換の縮合多環芳香族の2価基」は、上記「芳香族炭化水素」、「芳香族複素環」、または「縮合多環芳香族」から水素原子を2個取り除いてできる2価基を表す。
一般式(1)で表されるトリアリールアミン化合物において、一般式(2-1)~(2-2)におけるLとしては、「無置換の芳香族炭化水素の2価基」、「無置換の芳香族複素環の2価基」、または「無置換の縮合多環芳香族の2価基」であることが好ましい。そして、「芳香族炭化水素」、または「縮合多環芳香族」から水素原子を2個取り除いてできる2価基であることが好ましく、「芳香族炭化水素」から水素原子を2個取り除いてできる2価基であることがより好ましく、ベンゼンから水素原子を2個取り除いてできる2価基(フェニレン基)であることがさらに好ましい。
一般式(1)で表されるトリアリールアミン化合物において、一般式(2-1)における2価基Lの個数mは、1または2であることが好ましい。
ここで、R4~R8はそれぞれ隣接するQ1、Q2またはQ3、すなわち、Y1がN-R4、CR5R6、またはSiR7R8の場合はQ1と、Y2がN-R4、CR5R6、またはSiR7R8の場合はQ2もしくはQ3と、Y3がN-R4、CR5R6、またはSiR7R8の場合はQ3と、それぞれが置換もしくは無置換のメチレン基、酸素原子、硫黄原子、一置換アミノ基などの連結基を介して互いに結合して環を形成してもよい。
また、R5とR6、R7とR8はそれぞれの基同士で単結合、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。
なお、R4~R8の定義は更に下記の記載で詳細に説明する。
一般式(3-1)および一般式(3-2)において、Y1としては、N-R4、O、Sが好ましく、O、Sがより好ましい。また、前記一般式(3-1)および一般式(3-2)において、Y2とY3のうち少なくとも一方はN-R4であることが好ましく、両方ともがN-R4であることがより好ましい。R4としては、「置換もしくは無置換の芳香族炭化水素基」、または「置換もしくは無置換の縮合多環芳香族基」が好ましく、置換もしくは無置換のフェニル基、ビフェニリル基、ターフェニリル基、ナフチル基がより好ましい。
反応容器に、ビス(4-ナフタレン-2-イル-フェニル)アミン:10.0g、4-ブロモ-2’,5’-ジフェニル-ビフェニル:11.0g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.2g、tert-ブトキシナトリウム:2.7gを仕込み、トルエン溶媒中にて3時間還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物をトルエン/アセトンの混合溶媒による晶析法による精製を行うことで、ビス(4-ナフタレン-2-イル-フェニル)-(2’,5’-ジフェニル-ビフェニル-4-イル)-アミン(化合物1-4)の白色粉体:9.0g(収率:52.3%)を得た。
δ(ppm)=8.06(2H)、7.92(6H)、7.78(4H)、7.73(1H)、7.68(5H)、7.53(7H)、7.42(1H)、7.39-7.23(9H)、7.14(4H).
反応容器に、(2’,5’-ジフェニル-ビフェニル-4-イル)-(4-ナフタレン-1-イル-フェニル)アミン:8.5g、9-ブロモ-フェナンスレン:4.8g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.3g、tert-ブトキシナトリウム:2.3gを仕込み、トルエン溶媒中にて3時間還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物をトルエン/アセトンの混合溶媒による晶析法による精製を行うことで、(2’,5’-ジフェニル-ビフェニル-4-イル)-(4-ナフタレン-1-イル-フェニル)-フェナンスレン-9-イル-アミン(化合物1-58)の白色粉体:8.3g(収率:73.1%)を得た。
δ(ppm)=8.79(1H)、8.75(1H)、8.14(1H)、8.03(1H)、7.92(1H)、7.85(2H)、7.72(6H)、7.65(2H)、7.60(1H)、7.50(7H)、7.42(1H)、7.36(3H)、7.27-7.18(6H)、7.09(4H).
反応容器に、(2’,5’-ジフェニル-ビフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)アミン:8.0g、9-ブロモ-フェナンスレン:4.5g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.2g、tert-ブトキシナトリウム:2.2gを仕込み、トルエン溶媒中にて3時間還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物をトルエン/アセトンの混合溶媒による晶析法による精製を行うことで、(2’,5’-ジフェニル-ビフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)-フェナンスレン-9-イル-アミン(化合物1-59)の淡黄色粉体:6.6g(収率:61.7%)を得た。
δ(ppm)=8.79(1H)、8.74(1H)、8.09(1H)、8.01(1H)、7.86(4H)、7.75(1H)、7.71(5H)、7.66(2H)、7.60(3H),7.50(5H),7.39(1H),7.34-7.23(6H),7.20(2H),7.07(4H).
反応容器に、(4-ナフタレン-2-イル-フェニル)-フェニルアミン:6.0g、4-ブロモ-2’’,5’’-[1,1’:4’,1’’]ターフェニル:10.3g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.2g、tert-ブトキシナトリウム:2.3gを仕込み、トルエン溶媒中にて一晩還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物を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/n-ヘプタン)によって精製を行うことで、(2’’,5’’-ジフェニル-[1,1’:4’,1’’]ターフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)-フェニルアミン(化合物1-69)の白色粉体:7.1g(収率:51.7%)を得た。
δ(ppm)=8.04(1H)、7.91(3H)、7.73(5H)、7.66(2H)、7.56(2H)、7.51(7H)、7.42(1H)、7.39-7.18(15H)、7.10(1H).
反応容器に、(4-フェナンスレン-9-イル-フェニル)-フェニルアミン:11.0g、4-ブロモ-2’’,5’’-[1,1’:4’,1’’]ターフェニル:16.2g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.3g、tert-ブトキシナトリウム:3.7gを仕込み、トルエン溶媒中にて一晩還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物を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/n-ヘプタン)によって精製を行うことで、(2’’,5’’-ジフェニル-[1,1’:4’,1’’]ターフェニル-4-イル)-(4-フェナンスレン-9-イル-フェニル)-フェニルアミン(化合物1-83)の白色粉体:11.2g(収率:48.5%)を得た。
δ(ppm)=8.81(1H)、8.75(1H)、8.09(1H)、7.93(1H)、7.71(7H)、7.65-7.44(10H)、7.44-7.22(17H)、7.11(1H).
反応容器に、4-ブロモフェニル-(2’,5’-ジフェニル-ビフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)アミン:11.0g、4-ナフタレン-1-イル-フェニルボロン酸:4.8g、テトラキス(トリフェニルホスフィン)パラジウム(0):0.4g、炭酸カリウム:4.5gを仕込み、トルエン/エタノール/H2Oの混合溶媒中にて一晩還流撹拌した。放冷した後、メタノールを加えて析出した粗生成物を濾過して得た。得られた粗生成物をトルエン/アセトンの混合溶媒によって晶析法による精製を行うことで、(2’,5’-ジフェニル-ビフェニル-4-イル)-(4’-ナフタレン-1-イル-ビフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)アミン(化合物1-108)の白色粉体:11.0g(収率:84.6%)を得た。
δ(ppm)=8.04(1H)、7.99(1H)、7.92(1H)、7.90(1H)、7.87(3H)、7.76(1H)、7.74-7.69(5H)、7.65(3H)、7.61(2H)、7.57(2H)、7.54(1H)、7.53-7.42(8H)、7.38(1H)、7.34-7.21(9H)、7.11(4H).
反応容器に、4-ブロモフェニル-(2’,5’-ジフェニル-ビフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)アミン:12.0g、3-ナフタレン-2-イル-フェニルボロン酸:5.3g、テトラキス(トリフェニルホスフィン)パラジウム(0):0.4g、炭酸カリウム:4.9gを仕込み、トルエン/エタノール/H2Oの混合溶媒中にて一晩還流撹拌した。放冷した後、メタノールを加えて析出した粗生成物を濾過して得た。得られた粗生成物をトルエン/アセトンの混合溶媒によって晶析法による精製を行うことで、(2’,5’-ジフェニル-ビフェニル-4-イル)-(3’-ナフタレン-2-イル-ビフェニル-4-イル)-(4-ナフタレン-2-イル-フェニル)アミン(化合物1-112)の白色粉体:11.3g(収率:79.7%)を得た。
δ(ppm)=8.11(1H)、8.03(1H)、7.97-7.93(7H)、7.81(1H)、7.78-7.57(10H)、7.57-7.43(8H)、7.37(1H)、7.33-7.03(14H).
反応容器に、(2’’,5’’-ジフェニル-[1,1’:4’,1’’]ターフェニル-4-イル)-フェニルアミン:11.0g、2-ブロモ-9,9-ジフェニル-9H-フルオレン:10.2g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.2g、tert-ブトキシナトリウム:2.7gを仕込み、トルエン溶媒中にて一晩還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物を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/n-ヘプタン)によって精製を行うことで、(9,9-ジフェニル-9H-フルオレン-2-イル)-(2’’,5’’-ジフェニル-[1,1’:4’,1’’]ターフェニル-4-イル)-フェニルアミン(化合物1-145)の白色粉体:15.0g(収率:81.9%)を得た。
δ(ppm)=7.71(2H)、7.67(3H)、7.60(1H)、7.52(1H)、7.50-7.40(6H)、7.40-7.30(3H)、7.27-7.13(21H)、7.08(4H)、7.04(1H)、7.00(1H).
反応容器に、ビフェニル-4-イル-(5’-ナフタレン-2-イル-[1,1’:2’,1’’]ターフェニル-4-イル)アミン:10.0g、4-ブロモ-[1,1’:4’,1’’]ターフェニル:6.5g、酢酸パラジウム(II):0.1g、トリ(tert-ブチル)ホスフィン:0.2g、tert-ブトキシナトリウム:2.2gを仕込み、トルエン溶媒中にて一晩還流撹拌した。放冷した後、濾過して得られた濾液を濃縮して粗生成物を得た。得られた粗生成物をトルエン/アセトンの混合溶媒によって晶析法による精製を行うことで、ビフェニル-4-イル-(5’-ナフタレン-2-イル-[1,1’:2’,1’’]ターフェニル-4-イル)-([1,1’:4’,1’’]ターフェニル-4-イル)アミン(化合物1-174)の白色粉体:10.4g(収率:72.4%)を得た。
δ(ppm)=8.15(1H)、7.95(1H)、7.92(1H)、7.88(1H)、7.85(2H)、7.78(1H)、7.67(4H)、7.64(2H)、7.60(1H)、7.57(3H)、7.55-7.48(5H)、7.45(2H)、7.43(2H)、7.36(1H)、7.34-7.26(6H)、7.20(4H)、7.15(2H)、7.07(2H).
反応容器に1-ブロモベンゼン(D-置換):45.0g、4-tert-ブチルアニリン:58.0g、酢酸パラジウム(II):1.0g、tert-ブトシキナトリウム:30.0g、ビス(ジフェニルホスフィノ)-1,1’-ビナフチル:2.0g、トルエン:450mLを加えて24時間還流撹拌した。放冷した後、濃縮してカラムクロマトグラフにより精製を行うことで、下記化合物(3-1-11a)の粉体:49.9g(収率78%)を得た。
ガラス転移点(Tg)
実施例1の化合物 107.1℃
実施例2の化合物 131.2℃
実施例3の化合物 129.7℃
実施例4の化合物 110.0℃
実施例5の化合物 127.9℃
実施例6の化合物 121.4℃
実施例7の化合物 109.5℃
実施例8の化合物 136.2℃
実施例9の化合物 116.1℃
仕事関数
実施例1の化合物 5.67eV
実施例2の化合物 5.72eV
実施例3の化合物 5.75eV
実施例4の化合物 5.72eV
実施例5の化合物 5.76eV
実施例6の化合物 5.69eV
実施例7の化合物 5.69eV
実施例8の化合物 5.68eV
実施例9の化合物 5.69eV
比較のために、実施例13において、第二正孔輸送層5の材料として実施例1の化合物(1-4)に代えて下記構造式の化合物(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、常温で直流電圧を印加したときの発光特性の測定を行った。その結果を表1にまとめて示した。
比較のために、実施例13において、第二正孔輸送層5の材料として実施例1の化合物(1-4)に代えて下記構造式の化合物(HTM-3)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、常温で直流電圧を印加したときの発光特性の測定を行った。その結果を表1にまとめて示した。
2 透明陽極
3 正孔注入層
4 第一正孔輸送層
5 第二正孔輸送層
6 発光層
7 電子輸送層
8 電子注入層
9 陰極
10 キャッピング層
Claims (7)
- 陽極と陰極の間に、陽極側から少なくとも第一正孔輸送層と第二正孔輸送層と青色発光層と電子輸送層と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、前記第二正孔輸送層、または前記第一正孔輸送層と前記電子輸送層との間に配置された積層膜のうちの少なくとも一層に、下記一般式(1)で表されるトリアリールアミン化合物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、A、BおよびCは相互に同一でも異なってもよく、下記一般式(2-1)で示される破線部を結合部位とする1価基、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、または置換もしくは無置換の縮合多環芳香族基を表す。但し、A、BおよびCの全てが、同時に下記一般式(2-1)で表される1価基となることはないものとする。)
(2-1)
(式中、破線部は結合部位である。R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。nはRの個数であり、0~3の整数を表す。ここで、nが2または3である場合、同一のベンゼン環に複数個結合するR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。Lは置換もしくは無置換の芳香族炭化水素の2価基、置換もしくは無置換の芳香族複素環の2価基、または置換もしくは無置換の縮合多環芳香族の2価基を表す。mは1~3の整数を表す。ここで、mが2または3である場合、Lは相互に同一でも異なってもよい。Ar1、Ar2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。) - 前記青色発光層が、青色発光性ドーパントを含有することを特徴とする、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。
- 前記青色発光性ドーパントが、下記一般式(3-1)または一般式(3-2)で表される化合物であることを特徴とする、請求項5記載の有機エレクトロルミネッセンス素子。
(3-1)
(3-2)
(一般式(3-1)及び一般式(3-2)中、Q1~Q3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、置換もしくは無置換の縮合多環芳香族、または置換もしくは無置換の芳香族複素環を表す。XはB、P、P=O、またはP=Sを表す。Y1~Y3は相互に同一でも異なってもよく、N-R4、CR5R6、O、S、SeまたはSiR7R8の中から選択されるいずれか1つであり、そのR4~R8は相互に同一でも異なってもよく、水素原子、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1~6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5~10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2~6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1~6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5~10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。また、R5とR6、R7とR8はそれぞれの基同士で単結合、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。ここで、Y1~Y3がN-R4、CR5R6、またはSiR7R8の場合、R4~R8はそれぞれ隣接するQ1、Q2またはQ3と、置換もしくは無置換のメチレン基、酸素原子、硫黄原子、一置換アミノ基などの連結基を介して互いに結合して環を形成してもよい。) - 前記青色発光層が、分子中にアントラセン骨格を有するアントラセン誘導体を含有することを特徴とする、請求項1~6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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