WO2012046839A1 - ベンゾ[k]フルオランテン誘導体及びそれを含んでなる有機エレクトロルミネッセンス素子 - Google Patents
ベンゾ[k]フルオランテン誘導体及びそれを含んでなる有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2012046839A1 WO2012046839A1 PCT/JP2011/073202 JP2011073202W WO2012046839A1 WO 2012046839 A1 WO2012046839 A1 WO 2012046839A1 JP 2011073202 W JP2011073202 W JP 2011073202W WO 2012046839 A1 WO2012046839 A1 WO 2012046839A1
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- HAXBIWFMXWRORI-UHFFFAOYSA-N Benzo[k]fluoranthene Chemical class C1=CC(C2=CC3=CC=CC=C3C=C22)=C3C2=CC=CC3=C1 HAXBIWFMXWRORI-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000005401 electroluminescence Methods 0.000 title claims abstract description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims description 138
- 239000000463 material Substances 0.000 claims description 43
- 125000003118 aryl group Chemical group 0.000 claims description 39
- 125000000623 heterocyclic group Chemical group 0.000 claims description 38
- 239000002019 doping agent Substances 0.000 claims description 34
- 238000002347 injection Methods 0.000 claims description 34
- 239000007924 injection Substances 0.000 claims description 34
- 125000001424 substituent group Chemical group 0.000 claims description 32
- 125000006413 ring segment Chemical group 0.000 claims description 29
- 125000000217 alkyl group Chemical group 0.000 claims description 24
- 229920006395 saturated elastomer Polymers 0.000 claims description 24
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 20
- 125000004104 aryloxy group Chemical group 0.000 claims description 19
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 19
- 125000005843 halogen group Chemical group 0.000 claims description 18
- 125000003545 alkoxy group Chemical group 0.000 claims description 17
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 15
- 229910052783 alkali metal Inorganic materials 0.000 claims description 14
- 150000001340 alkali metals Chemical group 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 14
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 claims description 14
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 13
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 13
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 13
- 150000002910 rare earth metals Chemical class 0.000 claims description 12
- 150000001721 carbon Chemical class 0.000 claims description 11
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 11
- 125000005110 aryl thio group Chemical group 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 125000004414 alkyl thio group Chemical group 0.000 claims description 8
- 125000004429 atom Chemical group 0.000 claims description 8
- 125000004663 dialkyl amino group Chemical group 0.000 claims description 8
- 239000010409 thin film Substances 0.000 claims description 7
- 125000004986 diarylamino group Chemical group 0.000 claims description 6
- 150000004820 halides Chemical class 0.000 claims description 5
- 229910001508 alkali metal halide Inorganic materials 0.000 claims description 3
- 150000008045 alkali metal halides Chemical class 0.000 claims description 3
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 3
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 claims description 3
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 3
- 125000003277 amino group Chemical group 0.000 claims description 3
- 238000007363 ring formation reaction Methods 0.000 claims description 3
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 2
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- 125000002950 monocyclic group Chemical group 0.000 description 16
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
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- ROFVEXUMMXZLPA-UHFFFAOYSA-N Bipyridyl Chemical group N1=CC=CC=C1C1=CC=CC=N1 ROFVEXUMMXZLPA-UHFFFAOYSA-N 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
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- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 6
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- BBEAQIROQSPTKN-UHFFFAOYSA-N pyrene Chemical compound C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 description 6
- WSRVLNYECFRQKE-UHFFFAOYSA-N (7,12-diphenylbenzo[k]fluoranthen-3-yl)boronic acid Chemical compound C=12C3=CC=CC=1C(B(O)O)=CC=C2C(C(=C1C=CC=CC1=1)C=2C=CC=CC=2)=C3C=1C1=CC=CC=C1 WSRVLNYECFRQKE-UHFFFAOYSA-N 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 5
- KHNYNFUTFKJLDD-UHFFFAOYSA-N Benzo[j]fluoranthene Chemical group C1=CC(C=2C3=CC=CC=C3C=CC=22)=C3C2=CC=CC3=C1 KHNYNFUTFKJLDD-UHFFFAOYSA-N 0.000 description 5
- 125000005428 anthryl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C(*)=C([H])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 5
- 125000003710 aryl alkyl group Chemical group 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 230000005525 hole transport Effects 0.000 description 5
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- 125000004430 oxygen atom Chemical group O* 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 125000001637 1-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C(*)=C([H])C([H])=C([H])C2=C1[H] 0.000 description 4
- HZNVUJQVZSTENZ-UHFFFAOYSA-N 2,3-dichloro-5,6-dicyano-1,4-benzoquinone Chemical compound ClC1=C(Cl)C(=O)C(C#N)=C(C#N)C1=O HZNVUJQVZSTENZ-UHFFFAOYSA-N 0.000 description 4
- 125000004204 2-methoxyphenyl group Chemical group [H]C1=C([H])C(*)=C(OC([H])([H])[H])C([H])=C1[H] 0.000 description 4
- 125000001622 2-naphthyl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C(*)C([H])=C([H])C2=C1[H] 0.000 description 4
- 125000004207 3-methoxyphenyl group Chemical group [H]C1=C([H])C(*)=C([H])C(OC([H])([H])[H])=C1[H] 0.000 description 4
- AQIZKIPLILIXOK-UHFFFAOYSA-N 4-(4-bromophenyl)-2-phenyl-6-pyridin-2-ylpyrimidine Chemical compound C1=CC(Br)=CC=C1C1=CC(C=2N=CC=CC=2)=NC(C=2C=CC=CC=2)=N1 AQIZKIPLILIXOK-UHFFFAOYSA-N 0.000 description 4
- 125000004801 4-cyanophenyl group Chemical group [H]C1=C([H])C(C#N)=C([H])C([H])=C1* 0.000 description 4
- 125000004172 4-methoxyphenyl group Chemical group [H]C1=C([H])C(OC([H])([H])[H])=C([H])C([H])=C1* 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 4
- DGEZNRSVGBDHLK-UHFFFAOYSA-N [1,10]phenanthroline Chemical group C1=CN=C2C3=NC=CC=C3C=CC2=C1 DGEZNRSVGBDHLK-UHFFFAOYSA-N 0.000 description 4
- 150000001491 aromatic compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 125000003914 fluoranthenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC=C4C1=C23)* 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000005283 ground state Effects 0.000 description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
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- 125000004076 pyridyl group Chemical group 0.000 description 4
- 230000006798 recombination Effects 0.000 description 4
- 238000005215 recombination Methods 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- OATGRTIOGXDQQF-UHFFFAOYSA-N 2-(4-bromophenyl)-1,10-phenanthroline Chemical compound C1=CC(Br)=CC=C1C1=CC=C(C=CC=2C3=NC=CC=2)C3=N1 OATGRTIOGXDQQF-UHFFFAOYSA-N 0.000 description 3
- NCRIDSGPLISUEU-UHFFFAOYSA-N 2-bromo-6-pyridin-2-ylpyridine Chemical compound BrC1=CC=CC(C=2N=CC=CC=2)=N1 NCRIDSGPLISUEU-UHFFFAOYSA-N 0.000 description 3
- 125000004198 2-fluorophenyl group Chemical group [H]C1=C([H])C(F)=C(*)C([H])=C1[H] 0.000 description 3
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- 125000004180 3-fluorophenyl group Chemical group [H]C1=C([H])C(*)=C([H])C(F)=C1[H] 0.000 description 3
- 125000001255 4-fluorophenyl group Chemical group [H]C1=C([H])C(*)=C([H])C([H])=C1F 0.000 description 3
- 125000004199 4-trifluoromethylphenyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C(F)(F)F 0.000 description 3
- PSRUTZHGMSPRPZ-UHFFFAOYSA-N 5-bromoacenaphthylene Chemical group C1=CC2=CC=CC3=C2C1=CC=C3Br PSRUTZHGMSPRPZ-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 3
- 125000005103 alkyl silyl group Chemical group 0.000 description 3
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Natural products C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 3
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 3
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- 125000000040 m-tolyl group Chemical group [H]C1=C([H])C(*)=C([H])C(=C1[H])C([H])([H])[H] 0.000 description 3
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- 125000003261 o-tolyl group Chemical group [H]C1=C([H])C(*)=C(C([H])=C1[H])C([H])([H])[H] 0.000 description 3
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- CLHHJNBWPIDDIE-RMKNXTFCSA-N (e)-3-(4-bromophenyl)-1-pyridin-2-ylprop-2-en-1-one Chemical compound C1=CC(Br)=CC=C1\C=C\C(=O)C1=CC=CC=N1 CLHHJNBWPIDDIE-RMKNXTFCSA-N 0.000 description 2
- MBWSEPXTVAGLJS-UHFFFAOYSA-N 3-bromo-7,12-diphenylbenzo[k]fluoranthene Chemical compound C=12C3=CC=CC=1C(Br)=CC=C2C(C(=C1C=CC=CC1=1)C=2C=CC=CC=2)=C3C=1C1=CC=CC=C1 MBWSEPXTVAGLJS-UHFFFAOYSA-N 0.000 description 2
- 125000003349 3-pyridyl group Chemical group N1=C([H])C([*])=C([H])C([H])=C1[H] 0.000 description 2
- 125000004800 4-bromophenyl group Chemical group [H]C1=C([H])C(*)=C([H])C([H])=C1Br 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 229910052693 Europium Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
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- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 2
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 125000004453 alkoxycarbonyl group Chemical group 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 125000005104 aryl silyl group Chemical group 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 description 2
- 125000000499 benzofuranyl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 description 2
- 125000004196 benzothienyl group Chemical group S1C(=CC2=C1C=CC=C2)* 0.000 description 2
- 125000006269 biphenyl-2-yl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C1=C(*)C([H])=C([H])C([H])=C1[H] 0.000 description 2
- 125000000319 biphenyl-4-yl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C1=C([H])C([H])=C([*])C([H])=C1[H] 0.000 description 2
- 229910052792 caesium Inorganic materials 0.000 description 2
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- WDECIBYCCFPHNR-UHFFFAOYSA-N chrysene Chemical compound C1=CC=CC2=CC=C3C4=CC=CC=C4C=CC3=C21 WDECIBYCCFPHNR-UHFFFAOYSA-N 0.000 description 2
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- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 2
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- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- BGTFRFFRQKBWLS-UHFFFAOYSA-M lithium;quinolin-2-olate Chemical compound [Li+].C1=CC=CC2=NC([O-])=CC=C21 BGTFRFFRQKBWLS-UHFFFAOYSA-M 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
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- 125000001037 p-tolyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 2
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 2
- 238000001296 phosphorescence spectrum Methods 0.000 description 2
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- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 125000003373 pyrazinyl group Chemical group 0.000 description 2
- 125000005581 pyrene group Chemical group 0.000 description 2
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010898 silica gel chromatography Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 125000005415 substituted alkoxy group Chemical group 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
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- 125000001544 thienyl group Chemical group 0.000 description 2
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- 125000002030 1,2-phenylene group Chemical group [H]C1=C([H])C([*:1])=C([*:2])C([H])=C1[H] 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C13/00—Cyclic hydrocarbons containing rings other than, or in addition to, six-membered aromatic rings
- C07C13/28—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof
- C07C13/32—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings
- C07C13/62—Polycyclic hydrocarbons or acyclic hydrocarbon derivatives thereof with condensed rings with more than three condensed rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/06—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom
- C07D213/22—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom containing only hydrogen and carbon atoms in addition to the ring nitrogen atom containing two or more pyridine rings directly linked together, e.g. bipyridyl
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
- C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
- C07D471/04—Ortho-condensed systems
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
- H10K85/623—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing five rings, e.g. pentacene
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
Definitions
- the present invention relates to an organic electroluminescence device (organic EL device) comprising a benzo [k] fluoranthene derivative and a benzo [k] fluoranthene derivative.
- Patent Document 1 discloses a compound having a 1,10-phenanthroline structure or a bipyridine structure.
- the light emission luminance, half-life time, and light emission efficiency of the organic EL device containing these compounds described in the examples are only relative values based on the organic EL device using the comparative compound. Actual measurement values that enable determination of whether these compounds achieve practically effective EL device performance are not shown.
- Patent Documents 2 and 3 disclose anthracene compounds having two 2,2'-bipyridin-5-yl groups.
- the compound disclosed in Patent Document 3 has improved life but tends to increase driving voltage.
- Patent Document 4 discloses an anthracene compound having a 1,10-phenanthrolinyl group, but further improvement in life is desired.
- Patent Documents 5 and 6 describe the use of a benzo [k] fluoranthene compound having a benzimidazolyl group or a similar substituent as an electron transporting material.
- An object of the present invention is to provide a novel compound that solves the above-described problems of the compound, reduces the driving voltage of the organic EL element, and enables light emission with high efficiency and long life.
- the present inventors have found that a benzo [k] fluoranthene derivative described below achieves the above-described object, and has reached the present invention. That is, the present invention relates to the following benzo [k] fluoranthene derivatives, organic electroluminescent element materials, and organic EL elements containing the derivatives.
- R 1 to R 12 are each independently a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 8 ring carbon atoms.
- L is a single bond, a divalent or tetravalent residue of a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 30 ring carbon atoms, a substituted or unsubstituted ring atom having 5 to 30 ring atoms.
- X 1 to X 8 are each independently represented by a nitrogen atom or CR 13 , and at least one of X 1 to X 8 is CR 13.
- R 13 is independently a hydrogen atom, a halogen atom, or a substituent. Or an unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 8 ring carbon atoms, a substituted silyl group having 3 to 30 carbon atoms, a cyano group, and a substituted or unsubstituted carbon number.
- R 13 may be bonded to each other to form a substituted or unsubstituted saturated or unsaturated group, provided that X 4 and X 5 are CR 13 , and R 13 is bonded to each other. (Except when forming a substituted or unsubstituted methylene group.)
- R 21 to R 66 each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted cycloalkyl having 3 to 8 ring carbon atoms).
- any one of R 21 to R 28 is a single bond, and is bonded to L, except for the case where R 24 and R 25 are bonded to form a substituted or unsubstituted methylene group.
- two or more of R 31 to R 38 may be bonded to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 31 to R 38 is a single bond and is bonded to L.
- two or more of R 41 to R 47 may be bonded to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 41 to R 47 is a single bond and is bonded to L.
- R 51 to R 57 may be bonded to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 51 to R 57 is a single bond, and is bonded to L, except when R 53 and R 54 are bonded to form a substituted or unsubstituted methylene group.
- two or more of R 61 to R 66 may combine to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 61 to R 66 is a single bond and is bonded to L.
- a material for an organic electroluminescence device comprising the benzo [k] fluoranthene derivative according to any one of items 1 to 4.
- organic electroluminescent element material according to item 5, wherein the organic electroluminescent element material is an electron injection material or an electron transport material.
- organic electroluminescence device in which one or more organic thin film layers including a light emitting layer are sandwiched between a cathode and an anode, at least one of the organic thin film layers is benzo [k] according to any one of Items 1 to 4.
- organic electroluminescence device includes an electron injection layer or an electron transport layer, and the electron injection layer or the electron transport layer contains at least one benzo [k] fluoranthene derivative.
- the reducing dopant is an alkali metal, alkaline earth metal, rare earth metal, alkali metal oxide, alkali metal halide, alkaline earth metal oxide, alkaline earth metal halide, rare earth metal oxide.
- the organic electroluminescence device according to item 9 which is at least one selected from the group consisting of: halides of rare earth metals, organic complexes of alkali metals, organic complexes of alkaline earth metals, and organic complexes of rare earth metals.
- the organic EL device containing the benzo [k] fluoranthene derivative of the present invention exhibits low driving voltage, high efficiency, and long-life light emission.
- the benzo [k] fluoranthene derivative of the present invention is represented by the following formula (1).
- each of R 1 to R 12 independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 8 ring carbon atoms, A substituted silyl group having 3 to 30 carbon atoms, a cyano group, a substituted or unsubstituted alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 20 carbon atoms, a substituted or unsubstituted ring It is an aryl group having 6 to 30 carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms.
- at least one of R 1 to R 12 is represented by the following formula (1a) It is group represented by these.
- R 1 to R 12 in the formula (1) may be the same or different, and each group represented by each is as follows.
- the halogen atom is selected from a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, preferably a fluorine atom.
- alkyl group having 1 to 10 carbon atoms examples include ethyl, methyl, isopropyl, n-propyl, n-butyl, s-butyl, t -Butyl group, isobutyl group, pentyl group (including structural isomerism), hexyl group (including structural isomerism) and the like are preferable.
- substituted alkyl group examples include an alkyl group having a substituent described later.
- cycloalkyl group having 3 to 8 ring carbon atoms preferably 3 to 6
- a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, or a cyclohexyl group is preferable.
- the substituted cycloalkyl group include a cycloalkyl group having a substituent described later.
- the substituted silyl group having 3 to 30 carbon atoms includes alkylsilyl groups having 3 to 30 carbon atoms (including mono-, di- and trialkylsilyl groups) and arylsilyl groups having 8 to 30 carbon atoms (aryldialkylsilyl groups, diaryls).
- Examples of the alkylsilyl group having 3 to 30 carbon atoms include trimethylsilyl group, triethylsilyl group, t-butyldimethylsilyl group, vinyldimethylsilyl group, propyldimethylsilyl group, etc. Is mentioned.
- Examples of the arylsilyl group having 8 to 30 carbon atoms include a triphenylsilyl group, a phenyldimethylsilyl group, a t-butyldiphenylsilyl group, a tolylsilylsilyl group, a trixylsilyl group, and a trinaphthylsilyl group.
- alkoxy group having 1 to 20 carbon atoms is a group represented by —OY, and specific examples, preferred examples, and more preferred examples of Y are described with respect to the alkyl group. Selected from groups. Examples of the substituted alkoxy group include an alkoxy group having a substituent described later.
- Examples of the aryl group having 6 to 30 ring carbon atoms include a phenyl group, a naphthyl group, a phenanthryl group, a biphenyl group, a terphenyl group, an anthryl group, a pyrenyl group, and a chrysenyl group.
- substituted aryl group examples include an aryl group having a substituent described later, a 4-tolyl group, a 4-fluorophenyl group, a 4-trifluoromethylphenyl group, a 4-t-butylphenyl group, a 4-trimethylsilylphenyl group, 4-methoxyphenyl group, 4-cyanophenyl group, 3-tolyl group, 3-fluorophenyl group, 3-trifluoromethylphenyl group, 3-t-butylphenyl group, 3-trimethylsilylphenyl group, 3-methoxyphenyl group 3-cyanophenyl group, 2-tolyl group, 2-fluorophenyl group, 2-trifluoromethylphenyl group, 2-t-butylphenyl group, 2-trimethylsilylphenyl group, 2-methoxyphenyl group, 2-cyanophenyl Groups and the like are preferred.
- a phenyl group a phenyl group having a substituent described later
- the aryloxy group having 6 to 20 ring carbon atoms is a group represented by —OAr, and Ar is selected from the groups and preferred groups described for the aryl group.
- Examples of the substituted aryloxy group include an aryloxy group having a substituent described later.
- heterocyclic group having 5 to 30 ring atoms examples include pyridyl group, pyrazinyl group, pyrimidinyl group, pyridazinyl group, triazinyl group, indolyl group, quinolinyl group, isoquinolinyl group Group, quinoxalinyl group, acridinyl group, pyrrolidinyl group, dioxanyl group, piperidinyl group, morpholyl group, piperazinyl group, carbazolyl group, furanyl group, thiophenyl group, oxazolyl group, isoxazolyl group, oxadiazolyl group, furazanyl group, benzoxazolyl group, Thiazolyl, isothiazolyl, thiadiazolyl, benzothiophenyl, benzothiazolyl, triazolyl, imidazolyl, benzoimid
- R 1 to R 12 in the formula (1) include a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 8 ring carbon atoms, And a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms is preferred.
- R 7 and R 12 are hydrogen atoms or the substituents described above.
- the substituent includes phenyl group, 1-naphthyl group, 2-naphthyl group, 2-biphenyl group, 3-biphenyl group, 4-biphenyl group, 9-phenanthryl group, 1-pyrenyl group, 4-tolyl group, 4- Fluorophenyl group, 4-trifluoromethylphenyl group, 4-t-butylphenyl group, 4-trimethylsilylphenyl group, 4-methoxyphenyl group, 4-cyanophenyl group, 3-tolyl group, 3-fluorophenyl group, 3 -Trifluoromethylphenyl group, 3-t-butylphenyl group, 3-trimethylsilylphenyl group, 3-methoxyphenyl group, 3-cyanophenyl group, 2-tolyl group, 2-fluorophenyl group, 2-trifluoromethylphen
- L in the formula (1a) represents a single bond, a substituted or unsubstituted divalent aromatic hydrocarbon ring having 6 to 30 ring carbon atoms, a divalent or tetravalent residue, a substituted or unsubstituted ring atom number of 5 to A divalent to tetravalent residue of 30 heterocycles, or a divalent to tetravalent residue of a ring formed by bonding 2 to 3 rings selected from the aromatic hydrocarbon ring and heterocyclic ring with a single bond is there.
- the divalent to tetravalent (preferably divalent or trivalent, more preferably divalent) residue of the heterocyclic ring having 5 to 30 ring atoms (preferably 5 to 20, more preferably 5 to 12) is R A divalent to tetravalent group obtained by removing 1 to 3 hydrogen atoms from a heterocyclic group having 5 to 30 ring atoms described with respect to 1 to R 12 .
- a divalent to tetravalent residue of a ring selected from pyridine, pyrimidine, pyridazine, pyrazine, quinoline, isoquinoline and triazine is preferable; pyridinediyl group, pyrimidinediyl group, pyridazinediyl group, pyrazinediyl group, quinolinediyl group, and triazinediyl group Are more preferable; pyrimidine-2,5-diyl group, pyrimidine-2,4-diyl group, pyridazine-3,6-diyl group, pyrazine-2,5-diyl group, pyridine-2,4-diyl group, pyridine -2,5-diyl, pyridine-2,6-diyl, quinoline-5,8-diyl, quinoline-4,7-diyl, and triazine-2,4
- the divalent to tetravalent residue of the ring formed by bonding 2 to 3 rings selected from the aromatic hydrocarbon ring and heterocyclic ring with a single bond the divalent to tetravalent residues of the following compounds are preferable. Two to four bonds may be bonded to any position of the aromatic hydrocarbon ring and the heterocyclic ring.
- Preferred divalent residues include the following residues.
- the two bonds may be bonded to any position of the benzene ring in which each bond is contained, and either of the two bonds may be bonded to the benzofluoranthene skeleton, and either may be bonded to HAr.
- N in the formula (1a) is an integer of 1 to 3, preferably 1.
- n is 2 or 3
- 2 or 3 HAr may be the same or different.
- HAr is a group represented by the following formula (2).
- X 1 to X 8 are each independently represented by a nitrogen atom or CR 13 , and at least one of X 1 to X 8 is CR 13 .
- R 13 each independently represents a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 8 ring carbon atoms, or 3 to 30 carbon atoms.
- one of R 13 is a single bond and is bonded to L.
- Halogen atom substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, substituted or unsubstituted cycloalkyl group having 3 to 8 ring carbon atoms, substituted silyl group having 3 to 30 carbon atoms, cyano group, substituted or unsubstituted Substituted alkoxy groups having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy groups having 6 to 20 ring carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 ring carbon atoms, and substituted or unsubstituted Examples of the heterocyclic group having 5 to 30 ring atoms are as described for R 1 to R 12 .
- the alkylthio group having 1 to 20 carbon atoms is represented by —SY 1
- the mono- or dialkylamino group having 1 to 20 carbon atoms is represented by —NHY 2 and —NY 2 Y 3 .
- Y 1 , Y 2 and Y 3 are the same as Y described above.
- Examples of the optional substituent for the alkylthio group, mono- or dialkylamino group include those described later.
- the arylthio group having 6 to 20 ring carbon atoms is a group represented by —SAr 1 , and Ar 1 is the same as Ar.
- Examples of the substituted arylthio group include an aryloxy group having a substituent described later.
- a mono- or diarylamino group having 6 to 40 ring carbon atoms (preferably 6 to 20) is represented by —NHAr 1 or —NAr 2 Ar 3 .
- Ar 1 , Ar 2 and Ar 3 are the same as Ar.
- Examples of the substituted mono- or diarylamino group include mono- or diarylamino groups having a substituent described later.
- R 13 is preferably a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, and a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, preferably a hydrogen atom, a phenyl group, 2-, 3-, or 4-methoxyphenyl group, 2-, 3-, or 4-trimethylsilylphenyl group, 2-, 3-, or 4-trifluoromethylphenyl group, 2-, 3-, or 4- Cyanophenyl group, 2-, 3-, or 4-fluorophenyl group, 1-naphthyl group, 2-naphthyl group, 2-pyridyl group, 3-pyridyl group, 4-pyridyl group, 2-pyrimidinyl group, 2-triazinyl group And a 2-bipyridyl group, a 9-phenanthryl group, a 1-pyrenyl group, a 3-fluoranthenyl group
- Two or more R 13 may be bonded to each other to form a substituted or unsubstituted saturated or unsaturated group forming a part of the ring.
- X 4 and X 5 are CR 13 and R 13 is bonded to each other to form a substituted or unsubstituted methylene group is excluded.
- Two or more R 13 may not be contiguous, for example, when X 1 and X 4 is CR 13, a substituted or unsubstituted, saturated or the two R 13 together are combined to form a ring An unsaturated divalent group may be formed.
- the three R 13 may be bonded to form a substituted or unsubstituted saturated or unsaturated trivalent group. .
- the substituted or unsubstituted saturated or unsaturated group forming the ring may contain one or more heteroatoms selected from a nitrogen atom, an oxygen atom, and a sulfur atom in its main skeleton.
- the ring formed by combining two or more R 13 groups is, for example, a carbon 6-membered ring, a carbon 7-membered ring, a hetero 5-membered ring containing one oxygen atom and the other being a carbon atom, one oxygen atom
- the number of rings is preferably 1 to 8, more preferably 1 to 4, and particularly preferably 1 or 2.
- these rings may be the same or different.
- Examples of the group represented by the formula (2) when two or more R 13 are bonded to form a ring (arbitrary substituents are omitted) include residues of the following compounds.
- the above residues are preferably the following residues.
- the bond may be bonded to any position of the aromatic ring containing the bond (excluding the nitrogen atom).
- HAr in the formula (2) is preferably represented by the following formulas (3) to (7).
- R 21 to R 66 are a hydrogen atom, a halogen atom, or a group selected from the groups described for R 13 .
- R 21 to R 28 may be bonded to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 21 to R 28 preferably one of R 21 , R 22 , R 24 , R 25 , R 27 and R 28 , more preferably R 21 , R 22 , R 27 and R 28.
- R 31 to R 38 may be bonded to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 31 to R 38 preferably one of R 31 and R 38 is a single bond and is bonded to L.
- R 41 to R 47 may be bonded to form a saturated or unsaturated group forming a ring.
- any one of R 41 to R 47 preferably one of R 41 , R 43 and R 47 is a single bond and is bonded to L.
- R 51 to R 57 may be bonded to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 51 to R 57 preferably one of R 51 , R 52 and R 57 is a single bond and is bonded to L.
- R 53 and R 54 combine to form a substituted or unsubstituted methylene group.
- R 61 to R 66 may combine to form a substituted or unsubstituted saturated or unsaturated group forming a ring.
- any one of R 61 to R 66 preferably one of R 61 , R 62 and R 66 is a single bond and is bonded to L.
- -L- (HAr) n represented by the formula (1a) is preferably bonded to any of the 3, 4, 7, and 12 positions of the benzo [k] fluoranthene skeleton of the formula (1). Bonding is particularly preferred.
- the benzo [k] fluoranthene derivative represented by the formula (1) is preferably represented by the following formula (8). (Wherein R 1 to R 3 , R 5 to R 12 , HAr, L, and n are the same as those in the above formula (1).)
- the benzo [k] fluoranthene derivative represented by the formula (1) is more preferably represented by the following formula (9). (Wherein R 1 to R 3 , R 5 , R 6 , R 8 to R 11 , HAr, L, and n are the same as those in the above formula (1).)
- R 3 and R 4 are active sites of benzo [k] fluoranthene, and R 3 or R 4 is a substituent, preferably -L- (HAr) n
- R 3 or R 4 is a substituent, preferably -L- (HAr) n
- L of the benzo [k] fluoranthene derivative represented by the formula (1), (8) or (9) is a single bond, a benzofluoranthene skeleton (charge transport site) and-(HAr) n (electron injection site) ) Is short, it is considered that the charge transfer in the molecule is smooth (electrons can move to the charge transport site in a short time). Therefore, it is considered that the drive voltage is reduced.
- L is a substituted or unsubstituted 2- to 4-valent residue of an aromatic hydrocarbon ring having 6 to 30 ring carbon atoms, a substituted or unsubstituted ring atom number of 5 to 5 A divalent to tetravalent residue of 30 heterocycles, or a divalent to tetravalent residue of a ring formed by bonding 2 to 3 rings selected from the aromatic hydrocarbon ring and heterocyclic ring with a single bond
- the distance between the benzo [k] fluoranthene skeleton and — (HAr) n becomes long, so that it is considered that the electronic involvement of the benzofluoranthene skeleton and — (HAr) n can be reduced.
- R 7 and R 12 each independently have 6 to 30 ring carbon atoms (preferably 6 to 20, more preferably 6 to 12).
- An aryl group is preferred, and it is particularly preferred that R 7 and R 12 are both phenyl groups.
- R 7 and R 12 are each an aryl group, the planarity of the benzo [k] fluoranthene skeleton is considered to be improved.
- the benzo [k] fluoranthene derivative with improved planarity it is considered that the overlap between molecules is large and the distance between the molecules is shortened, and the charge transport property of the benzo [k] fluoranthene derivative can be further enhanced.
- the hydrogen atom of the benzo [k] fluoranthene derivative of the present invention includes light hydrogen and deuterium.
- ring-forming carbon means carbon atoms constituting a saturated ring, an unsaturated ring, or an aromatic ring.
- Ring-forming atom means a carbon atom and a heteroatom constituting a heterosaturated ring, heterounsaturated ring, or heteroaromatic ring.
- fluorine atom methyl group, 1-, 2- or 3-pyridyl group, trimethylsilyl group, methoxy group, cyano group, 1- or 2-naphthyl group, 2-, 3- or 4-methoxyphenyl group 2-, 3- or 4-trimethylsilylphenyl group, 2-, 3- or 4-cyanophenyl group, 2-pyrimidyl group, 2-triazinyl group, 3- or 4-bipyridyl group, and the like.
- the benzo [k] fluoranthene derivative of the present invention described in detail above includes a benzo [k] fluoranthene skeleton having high planarity, and since the molecules overlap each other well, it is considered to have a high charge transport property.
- the benzo [k] fluoranthene skeleton has a higher charge transport property than, for example, a fluoranthene skeleton because of its high planarity.
- the benzo [k] fluoranthene skeleton has high charge durability, and when the benzo [k] fluoranthene derivative of the present invention is used in an organic EL device, an improvement in life can be expected.
- holes may flow to the electron injecting layer side, the benzo [k] fluoranthene derivative of the present invention has hole resistance, so it is considered that deterioration of the element can be prevented.
- the benzo [k] fluoranthene derivative of the present invention has a benzo [k] fluoranthene skeleton, the affinity (Af) is increased.
- the adjacent metal complex layer or reducing dopant layer Can be expected to show good electron injection properties.
- the benzo [k] fluoranthene derivative of the present invention is considered to lower the driving voltage of the organic EL device.
- a heterocyclic ring such as a pyridine ring can be coordinated to a metal atom using an unshared electron pair on the nitrogen atom, so that it is considered that the affinity with the electrode is increased.
- the bipyridine structure or phenanthroline structure contained in HAr of the benzo [k] fluoranthene derivative of the present invention it is considered that two nitrogen atoms are present at a position where a chelate can be easily formed with a lithium ion or the like.
- two nitrogen atoms of the bipyridine structure can rotate around a single bond, it is considered that the distance can be changed according to the ionic radius of the coordinated metal ion.
- HAr contains two nitrogen atoms that are likely to form a chelate with a metal ion, so that the metal ion can be easily captured on the cathode side. Therefore, the organic EL element is more intensive than benzimidazolyl groups and other heterocyclic groups. It is thought that the electron injection property can be improved.
- the distance between two nitrogen atoms is increased as compared with the case of the bipyridine structure, and for example, ions having a small ionic radius such as lithium ions are captured. It is thought that it becomes difficult to do.
- the benzo [k] fluoranthene derivative of the present invention is a compound having a benzo [k] fluoranthene structure and a bipyridine structure or a similar structure in one molecule, and has excellent charge transport properties and charge durability. And a compound having both electron injection properties and electron injection properties.
- the benzo [k] fluoranthene derivative of the present invention is preferably used as a material for an organic EL device, and more preferably used as an electron injection material or an electron transport material for an organic EL device. This is because HAr mediates transfer of electrons from the adjacent layer. Moreover, it is considered that the benzo [k] fluoranthene derivative of the present invention can be suitably used as a triplet energy barrier material for the reasons described later.
- the benzo [k] fluoranthene skeleton which is the basic skeleton of the benzo [k] fluoranthene derivative of the present invention, has a high triplet energy and a high confinement effect of triplet excitons, so that it is in contact with the light emitting layer of an organic EL element, for example. It is considered that a TTF (Triplet-Triplet Fusion) phenomenon can be promoted by using it as a material for the barrier layer.
- the benzo [k] fluoranthene skeleton which is the basic skeleton of the benzo [k] fluoranthene derivative of the present invention, is characterized by improved molecular stacking in a thin film due to its high planarity and increased electron transport properties.
- the benzo [k] fluoranthene derivative of the present invention contains HAr, which is a nitrogen-containing heterocycle having high electron injection properties from a metal-containing layer such as an electrode, it has a low driving voltage without further stacking of an electron injection layer. It is considered that an organic EL element can be realized.
- the benzo [k] fluoranthene derivative of the present invention is a compound having both an electron injection / transport function and a triplet energy barrier function (triplet barrier function).
- the benzo [k] fluoranthene derivative of the present invention is a compound including a structural part having a triplet barrier function (triplet barrier structural part) and a structural part having an electron injection / transport function.
- the structural moiety is an individual cyclic structure (monocyclic or condensed polycyclic excluding substituents) contained in the compound.
- the triplet barrier structure site means a structure site having the lowest (smaller) triplet energy among the structure sites contained in the compound. That is, it is a structural site that mainly determines the triplet energy of the compound.
- the triplet energy of the triplet barrier structure site refers to the triplet energy of an independent cyclic structure in which hydrogen is substituted at the bonding position between the structure sites except for the substituent.
- the triplet barrier structure site must be a fused polycyclic aromatic hydrocarbon compound. The reason will be described below.
- the transition state of a condensed ring composed of hydrocarbons is based on a ⁇ - ⁇ * transition involving a ⁇ electron cloud of a cyclic structure.
- the spread of the ⁇ electron cloud is small, and the influence on the excited state of the light emitting layer is small.
- the transition state in the case of having an unshared electron pair at the structural site is that a strong interaction occurs with triplet excitons generated in the light-emitting layer due to the participation of the unshared electron pair, and the host 3 Promotes deactivation of doublet excitons.
- the triplet barrier structure portion of the barrier material must be a condensed ring mainly composed of hydrocarbons that form an excited triplet state based on the ⁇ - ⁇ * transition.
- the triplet energy of the barrier material is preferably larger than the triplet energy of the host of the light emitting layer.
- the triplet barrier function of the barrier material is largely determined by the triplet barrier structure site.
- a triplet is present in the structural part having the lowest triplet energy among the structural parts of the barrier material. Energy transitions. From this, when the triplet barrier structure site
- the structural site where the triplet energy is the lowest (small) among the structural sites contained in the compound is not composed of carbon and hydrogen, the compound does not have a triplet barrier structural site. It becomes.
- the TTF phenomenon is a phenomenon in which singlet excitons are generated by collisional fusion of triplet excitons. If this TTF phenomenon is used, not only the 25% singlet excitons that are generated initially but also triplet excitons are generated. Singlet excitons generated by collisional fusion of term excitons can also be used for light emission, and the light emission efficiency of the device can be increased.
- the barrier layer containing the benzo [k] fluoranthene derivative of the present invention is adjacent to the light emitting layer of the fluorescent element.
- the barrier layer containing the benzo [k] fluoranthene derivative of the present invention for a fluorescent element, it is considered that a TTF phenomenon is caused and a highly efficient organic EL element can be realized.
- the barrier layer of the present invention is a layer having a barrier function against triplet energy, and the functions thereof are different from those of the hole barrier layer and the charge barrier layer.
- the barrier layer, electron injection layer or electron transport layer containing the benzo [k] fluoranthene derivative of the present invention preferably further contains a reducing dopant.
- the reducing dopant include donor metals, donor metal compounds, and donor metal complexes. These reducing dopants may be used alone or in combination of two or more.
- the reducing dopant is a material that donates electrons (referred to as an electron donating material).
- This electron-donating material is an organic material that forms, together with the electron-donating material, another organic material included in the barrier layer, the electron injection layer, or the electron transport layer, or a layer adjacent to the barrier layer, the electron injection layer, or the electron transport layer.
- the donor metal means a metal having a work function of 3.8 eV or less, preferably an alkali metal, an alkaline earth metal, or a rare earth metal, and more preferably Cs, Li, Na, Sr, K, Mg, Ca, Ba. , Yb, Eu and Ce.
- the donor metal compound is a compound containing the above donor metal, preferably a compound containing an alkali metal, an alkaline earth metal or a rare earth metal, and more preferably a halide, oxide or carbonic acid of these metals. Salt, borate.
- MOx M is a donor metal
- x is 0.5 to 1.5
- MFx x is 1 to 3
- the donor metal complex is a complex of the above-described donor metal, and preferably an alkali metal, alkaline earth metal, or rare earth metal organometallic complex.
- An organometallic complex represented by the following formula (I) is preferable.
- M is a donor metal
- Q is a ligand, preferably a carboxylic acid derivative, diketone derivative or quinoline derivative, and n is an integer of 1 to 4.
- the donor metal complex examples include a tungsten turbine described in JP-A-2005-72012. Further, phthalocyanine compounds whose central metals are alkali metals and alkaline earth metals described in JP-A-11-345687 can also be used as donor metal complexes.
- the reducing dopant is preferably an alkali metal, alkaline earth metal, rare earth metal, alkali metal oxide, alkali metal halide, alkaline earth metal oxide, alkaline earth metal halide, rare earth metal
- alkali metal preferably an alkali metal, alkaline earth metal, rare earth metal, alkali metal oxide, alkali metal halide, alkaline earth metal oxide, alkaline earth metal halide, rare earth metal
- oxides, rare earth metal halides, alkali metal organic complexes, alkaline earth metal organic complexes and rare earth metal organic complexes more preferably alkali metal It is an 8-quinolinol complex.
- the triplet energy of the compound constituting the barrier layer comprising the benzo [k] fluoranthene derivative of the present invention must be higher than the triplet energy of the host mainly constituting the light emitting layer.
- the benzo [k] fluoranthene derivative of the present invention contained in the barrier layer and the host and dopant contained in the light emitting layer satisfy the following formulas (1) and (2).
- E T h, E T b, and E T d represent the triplet energy of the host material, the nitrogen-containing heterocyclic derivative of the barrier layer, and the dopant, respectively.
- FIG. 1 is a schematic configuration diagram of an organic EL element showing an example of an embodiment of the present invention.
- FIG. 2 schematically shows the lowest excited singlet energy level and the lowest excited triplet energy level of each layer.
- the triplet energy is the difference between the energy in the lowest excited triplet state and the energy in the ground state
- the singlet energy (sometimes referred to as an energy gap) is the lowest excited singlet state. The difference between energy and ground state energy.
- the organic EL element of the present invention may be an element having an anode, a light emitting layer, an electron transport zone, and a cathode in this order.
- the organic EL device shown in FIG. 20, the electron transport zone 30, and the cathode 40 are laminated in this order.
- a hole transport zone 50 is preferably provided between the anode 10 and the light emitting layer 20.
- the electron transport zone has a configuration including only a barrier layer.
- the electron transport zone only needs to include the barrier layer, and the embodiment of only the barrier layer does not prevent the insertion of the electron injection layer having a higher injection property.
- the general compound conventionally used as an electron injection layer can be used, and a hetero ring-containing compound is preferable.
- Triplet excitons generated by recombination on the dopant molecule quickly transfer energy to the host molecule. That is, triplet excitons collide with each other on the host efficiently by the TTF phenomenon without the triplet excitons of the host moving to the dopant, so that singlet excitons are generated. Furthermore, since the singlet energy E S d of the dopant is smaller than the singlet energy E S h of the host, the singlet exciton generated by the TTF phenomenon transfers energy from the host to the dopant, and the fluorescence of the dopant. Contributes to light emission.
- the barrier layer prevents triplet excitons generated in the light-emitting layer from diffusing into the electron transport band, and increases the density of triplet excitons by confining the triplet excitons in the light-emitting layer. It has a function to cause a phenomenon efficiently.
- the triplet energy E T b of the compound constituting the barrier layer is larger than E T h and further larger than E T d. preferable. Since the barrier layer prevents triplet excitons generated in the light emitting layer from diffusing into the electron transport band, the host triplet excitons efficiently become singlet excitons in the light emitting layer, The singlet exciton moves onto the dopant and is optically deactivated.
- the material forming the barrier layer is the benzo [k] fluoranthene derivative of the present invention. Since the benzo [k] fluoranthene derivative of the present invention has hole resistance, it is hardly deteriorated and the life of the device can be extended.
- the barrier layer containing the benzo [k] fluoranthene derivative of the present invention can also play a role of electron injection / transport function, electrons injected into the barrier material donate more electrons through the electron transport structure site. Cheap. That is, by moving to a structural part having a high LUMO level, it contributes to electron injection into the light emitting layer.
- a low work function metal-containing layer may be provided between the electron transport zone and the cathode.
- the low work function metal-containing layer is a layer containing a low work function metal or a low work function metal compound. Even if it is formed of only a low work function metal or a low work metal compound, it is formed by adding a low work function metal, a low work function metal compound, or a low work function metal complex as a donor to the material used for the electron transport layer. May be.
- a low work function metal means a metal having a work function of 3.8 eV or less. Examples of the metal having a low work function of 3.8 eV or less include alkali metals and alkaline earth metals. Examples of the alkali metal include Li, Na, K, and Cs.
- alkaline earth metal examples include Mg, Ca, Sr, and Ba. Other examples include Yb, Eu and Ce.
- the oxide, halide, carbonate, borate of a low work metal function is preferable.
- Halides include fluoride, chloride and bromide, with fluoride being preferred.
- LiF is preferably used.
- the low work function metal complex is a low work function metal complex, and an alkali metal, alkaline earth metal, or rare earth metal organometallic complex is preferable.
- the light emitting layer of the organic EL device of the present invention preferably contains at least one anthracene derivative represented by the following formula (4) or a pyrene derivative represented by the following formula (5) as a host.
- Anthracene derivative represented by the formula (4) is the following compound.
- Ar 11 and Ar 12 are each independently a substituted or unsubstituted monocyclic group having 5 to 50 ring atoms, a substituted or unsubstituted condensed ring group having 8 to 50 ring atoms, or a monocyclic group. And a group composed of a combination of a condensed ring group.
- R 101 to R 108 each independently represents a hydrogen atom, a substituted or unsubstituted monocyclic group having 5 to 50 ring atoms, a substituted or unsubstituted condensed ring group having 8 to 50 ring atoms, a monocycle A group composed of a combination of a group and a condensed ring group, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, a substituted or unsubstituted group An alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 50 ring carbon atoms, a substituted or unsubstituted silyl group, a halogen atom , A group selected from
- the monocyclic group in the formula (4) is a group composed of only a ring that is not condensed.
- monocyclic groups having 5 to 50 ring-forming atoms include aromatic groups such as phenyl group, biphenyl group, terphenyl group, and quarterphenyl group, Heterocyclic groups such as pyridyl group, pyrazyl group, pyrimidyl group, triazinyl group, furyl group and thienyl group are mentioned, and phenyl group, biphenyl group and terphenyl group are preferable.
- the condensed ring group is a group in which two or more ring structures are condensed.
- Specific examples of the condensed ring group having 8 to 50 ring atoms include naphthyl group, phenanthryl group, anthryl group, chrysenyl group, benzoanthryl group, benzoyl group.
- Phenanthryl group triphenylenyl group, benzocrisenyl group, indenyl group, fluorenyl group, 9,9-dimethylfluorenyl group, benzofluorenyl group, dibenzofluorenyl group, fluoranthenyl group, benzofluoranthenyl group, etc.
- condensed heterocyclic groups such as benzofuranyl group, benzothiophenyl group, indolyl group, dibenzofuranyl group, dibenzothiophenyl group, carbazolyl group, quinolyl group, phenanthrolinyl group, etc.
- alkyl group having 1 to 50 carbon atoms a cycloalkyl group having 3 to 50 ring carbon atoms, an alkoxy group having 1 to 50 carbon atoms, an aryloxy group having 6 to 50 ring carbon atoms, and a substituted or unsubstituted silyl group.
- the aralkyl group having 7 to 50 carbon atoms is represented by —Y—Z. Examples of Y include alkylene examples corresponding to the above alkyl examples, and examples of Z include the above aryl examples.
- the aryl moiety of the C 7-50 aralkyl group has 6 to 49 carbon atoms (preferably 6 to 30, more preferably 6 to 20, particularly preferably 6 to 12), and the alkyl moiety has 1 to 44 carbon atoms (preferably 1 To 30, more preferably 1 to 20, still more preferably 1 to 10, and particularly preferably 1 to 6)), and examples thereof include a benzyl group, a phenylethyl group, and a 2-phenylpropan-2-yl group.
- the anthracene derivative represented by the formula (4) is preferably any of the following anthracene derivatives (A), (B), and (C), and is selected according to the configuration of the organic EL element to be applied and the required characteristics. .
- Ar 11 and Ar 12 in formula (4) are each independently a substituted or unsubstituted condensed ring group having 8 to 50 ring atoms.
- the anthracene derivative can be classified into a case where Ar 11 and Ar 12 are the same substituted or unsubstituted condensed ring group and a case where they are different substituted or unsubstituted condensed ring groups.
- Anthracene derivatives which are substituted or unsubstituted condensed ring groups in which Ar 11 and Ar 12 in formula (4) are different (including differences in substitution position) are particularly preferred, and preferred specific examples of the condensed ring are as described above. Of these, naphthyl group, phenanthryl group, benzanthryl group, 9,9-dimethylfluorenyl group, and dibenzofuranyl group are preferable.
- Ar 11 and Ar 12 in formula (4) are a substituted or unsubstituted monocyclic group having 5 to 50 ring atoms, and the other is a substituted or unsubstituted ring atom having 8 to 8 ring atoms. 50 condensed ring groups.
- Ar 12 is a naphthyl group, phenanthryl group, benzoanthryl group, 9,9-dimethylfluorenyl group, dibenzofuranyl group
- Ar 11 is a phenyl group substituted with a monocyclic group or a condensed ring group. It is a group.
- Ar 12 is a condensed ring group
- Ar 11 is an unsubstituted phenyl group.
- the condensed ring group is particularly preferably a phenanthryl group, a 9,9-dimethylfluorenyl group, a dibenzofuranyl group, or a benzoanthryl group.
- Ar 11 and Ar 12 in formula (4) are each independently a substituted or unsubstituted monocyclic group having 5 to 50 ring atoms.
- both Ar 11 and Ar 12 are substituted or unsubstituted phenyl groups.
- Ar 11 is an unsubstituted phenyl group
- Ar 12 is a monocyclic group
- Ar 11 and Ar 12 are each independently a monocyclic group. In some cases, it may be a phenyl group having a condensed ring group as a substituent.
- a monocyclic group as a substituent is a phenyl group, a biphenyl group, and a condensed ring group is a naphthyl group, a phenanthryl group, a 9,9-dimethylfluorenyl group, a dibenzofuranyl group, or a benzoanthryl group.
- Ar 111 and Ar 222 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms.
- L 101 and L 102 each independently represent a substituted or unsubstituted divalent aryl group or heterocyclic group having 6 to 30 ring carbon atoms.
- m is an integer from 0 to 1
- n is an integer from 1 to 4
- s is an integer from 0 to 1
- t is an integer from 0 to 3.
- L 101 or Ar 111 is bonded to any of the 1 to 5 positions of pyrene
- L 102 or Ar 222 is bonded to any of the 6 to 10 positions of pyrene.
- L 101 and L 102 in Formula (5) are preferably a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, a substituted or unsubstituted naphthylene group, a substituted or unsubstituted terphenylene group, and a substituted or unsubstituted group. It is a divalent aryl group composed of a substituted fluorenylene group and a combination of these substituents. Further, this substituent is the same as the substituent in “substituted or unsubstituted...” In the formula (1).
- the substituent of L 101 and L 102 is preferably an alkyl group having 1 to 20 carbon atoms.
- M in the formula (5) is preferably an integer of 0 to 1.
- N in the formula (5) is preferably an integer of 1 to 2.
- s is preferably an integer of 0 to 1.
- T in the general formula (5) is preferably an integer of 0 to 2.
- the aryl group of Ar 111 and Ar 222 is the same as each group in formula (1).
- a substituted or unsubstituted aryl group having 6 to 20 ring carbon atoms more preferably a substituted or unsubstituted aryl group having 6 to 16 ring carbon atoms, and preferred specific examples of the aryl group include a phenyl group. Naphthyl group, phenanthryl group, fluorenyl group, biphenyl group, anthryl group, pyrenyl group.
- the light emitting layer containing the anthracene derivative represented by the formula (4) or the pyrene derivative represented by the formula (5) is preferably a barrier layer, an electron injection layer or an electron containing the benzo [k] fluoranthene derivative of the present invention. It is in contact with the transport layer.
- the light emitting layer is in contact with the barrier layer containing the benzo [k] fluoranthene derivative of the present invention, the electron injection layer, or the electron transport layer, the light emission efficiency can be increased by utilizing the TTF phenomenon.
- the light emitting layer may contain a light emitting dopant (phosphorescent dopant and / or fluorescent dopant).
- the fluorescent dopant is a compound that can emit light from singlet excitons. Fluorescent dopants are required from amine compounds, aromatic compounds, chelate complexes such as tris (8-quinolinolato) aluminum complex, coumarin derivatives, tetraphenylbutadiene derivatives, bisstyrylarylene derivatives, oxadiazole derivatives, etc.
- a compound selected according to the emission color is preferable, a styrylamine compound, a styryldiamine compound, an arylamine compound, an aryldiamine compound, and an aromatic compound are more preferable, and a condensed polycyclic amine derivative and an aromatic compound are further preferable.
- These fluorescent dopants may be used alone or in combination.
- Y represents a substituted or unsubstituted condensed aryl group having 10 to 50 ring carbon atoms.
- Ar 101 and Ar 102 each represent a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms or a substituted or unsubstituted heterocyclic group having 5 to 50 ring atoms.
- Specific examples of Y include the above-mentioned fused aryl groups, and preferred are a substituted or unsubstituted anthryl group, a substituted or unsubstituted pyrenyl group, and a substituted or unsubstituted chrysenyl group.
- Ar 101 and Ar 102 include the aryl group or heterocyclic group described above, preferably a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted biphenyl group, a substituted group. Alternatively, it is an unsubstituted terphenyl group or a substituted or unsubstituted dibenzofuranyl group.
- n is an integer of 1 to 4.
- n is preferably an integer of 1 to 2.
- alkyl group, alkoxy group, aryl group, aryloxy group, and heterocyclic group in the formula (12) include those exemplified above.
- a benzo [k] fluoranthene compound represented by the following formula (13) is preferable.
- X 301 to X 306 and X 308 to X 311 each independently represents a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted ring forming atom number of 5;
- X 307 and X 312 each independently represent a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, substituted or unsubstituted carbon It is selected from alkyl groups having 1 to 20 and substituted or unsubstituted cycloalkyl groups having 3 to 8 ring carbon atoms.
- X303 and X304 are mutually different substituents.
- adjacent substituents may be bonded to each other to form a saturated or unsaturated cyclic structure, and these cyclic structures may be substituted.
- X 303 or X 304 in formula (13) is preferably a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms. Further, a preferred substituent of “substituted or unsubstituted” in formula (13) is a cyano group or a halogen atom.
- the dopant is preferably a dopant exhibiting fluorescence emission having a main peak wavelength of 550 nm or less, and more preferably a blue light emitting dopant.
- the main peak wavelength refers to the peak wavelength of the emission spectrum that maximizes the emission intensity in the emission spectrum
- the main peak wavelength of 550 nm corresponds to about green light emission.
- WO2008 / 023759A1 WO2008 / 023759A1
- WO2009 / 107596A1 WO2009 / 081857A1
- US2009 / 0243473A1 US2008.
- / 0014464A1 US2009 / 0021160A1, etc. can be appropriately selected and used.
- Synthesis example 1 (A) Synthesis of 7,12-diphenylbenzo [k] fluoranthen-3-ylboronic acid According to the following scheme, 7,12-diphenylbenzo [k] fluoranthen-3-ylboronic acid was synthesized.
- the obtained yellow solid was recrystallized with 200 ml of toluene.
- the crystals were collected by filtration to obtain 19.8 g (yield: 74%) of a yellow solid, 3-bromo-7,12-diphenylbenzo [k] fluoranthene.
- the produced solid was collected by filtration, washed with water and methanol, and then dried under reduced pressure.
- the obtained solid was purified by silica gel chromatography to obtain 1.98 g of a yellow solid.
- the ionization potential was measured using an atmospheric photoelectron spectrometer (manufactured by Riken Keiki Co., Ltd .: AC-3). Specifically, it was determined by irradiating the material with light and measuring the amount of electrons generated by charge separation at that time.
- the energy gap was measured from the absorption edge of the absorption spectrum of the toluene solution of Compound 1 or 2. Specifically, the absorption spectrum was measured using a commercially available visible / ultraviolet spectrophotometer, and calculated from the wavelength (absorption edge) at which the spectrum started rising.
- Example 4 Manufacture of organic EL element A glass substrate (manufactured by Geomatic Co., Ltd.) with an ITO transparent electrode (anode) of 25 mm ⁇ 75 mm ⁇ 1.1 mm thickness was subjected to ultrasonic cleaning in isopropyl alcohol for 5 minutes, and then UV ozone cleaning For 30 minutes. The cleaned glass substrate with a transparent electrode line was mounted on a substrate holder of a vacuum vapor deposition apparatus, and a compound HT-1 having a thickness of 50 nm was first formed to cover the transparent electrode line. The HT-1 film functions as a hole injection layer.
- the compound HT-2 was vapor-deposited to form a 45 nm-thick HT-2 film on the HT-1 film.
- the HT-2 film functions as a hole transport layer.
- Compound BH-1 (host material) and compound BD-1 (dopant material) were deposited on the HT-2 film at a film thickness ratio of 20: 1 to form an organic layer having a film thickness of 25 nm. This organic layer functions as a light emitting layer.
- Compound 1 was deposited on the light emitting layer to form an electron transport layer having a thickness of 25 nm. Thereafter, LiF was formed to a thickness of 1 nm.
- metal Al was deposited to a thickness of 80 nm to form a metal cathode, thereby producing an organic EL light emitting device.
- Example 5 and Comparative Examples 1 and 2 Manufacture and Evaluation of Organic EL Device Example except that Compound 2 (Example 5), ET-1 (Comparative Example 1) or ET-2 (Comparative Example 2) was used instead of Compound 1 to form an electron transport layer
- Example 3 an organic EL device was produced and evaluated. The results are shown in Table 2.
- Example 6 Manufacture and Evaluation of Organic EL Element An organic EL element was prepared and evaluated in the same manner as in Example 5 except that a light emitting layer was formed using BD-2 instead of BD-1. The results are shown in Table 2.
- Example 7 A 25 mm ⁇ 75 mm ⁇ 1.1 mm thick glass substrate with ITO transparent electrode (anode) (manufactured by Geomatic) was ultrasonically cleaned in isopropyl alcohol for 5 minutes, and then UV ozone cleaning was performed for 30 minutes.
- the cleaned glass substrate with a transparent electrode line was mounted on a substrate holder of a vacuum vapor deposition apparatus, and a compound HT-1 having a thickness of 50 nm was first formed to cover the transparent electrode line.
- the HT-1 film functions as a hole injection layer.
- the compound HT-2 was vapor-deposited to form a 45 nm-thick HT-2 film on the HT-1 film.
- the HT-2 film functions as a hole transport layer.
- Compound BH-1 (host material) and compound BD-1 (dopant material) were deposited on the HT-2 film at a film thickness ratio of 20: 1 to form a light emitting layer having a film thickness of 25 nm.
- Compound 1 and lithium quinolinolate (Liq) were vapor-deposited on the light emitting layer at a film thickness ratio of 1: 1 to form an electron transport layer having a film thickness of 25 nm on the light emitting layer.
- metal Al was deposited to a thickness of 80 nm to form a metal cathode, thereby producing an organic EL device.
- the obtained organic EL device was evaluated in the same manner as in Example 3. The results are shown in Table 3.
- Examples 8 to 9 and Comparative Examples 3 to 4 Production and Evaluation of Organic EL Device Electron transport using Compound 2 (Example 8), Compound 3 (Example 9), ET-1 (Comparative Example 3) or ET-2 (Comparative Example 4) instead of Compound 1
- An organic EL device was prepared and evaluated in the same manner as in Example 7 except that the layer was formed. The results are shown in Table 3.
- Example 10 Production and Evaluation of Organic EL Element An organic EL element was prepared and evaluated in the same manner as in Example 7 except that BD-2 was used instead of BD-1 to form a light emitting layer. The results are shown in Table 3.
- the triplet energy of BH-1 of the host material is 1.8 eV when calculated by the same method as for compound 1 to compound 3, and the value of compound 1 to compound 3 is sufficiently larger than this, so that the light emitting layer It is conceivable that a triplet exciton confinement effect is produced.
- the organic EL element comprising the benzo [k] fluoranthene derivative of the present invention can be used for a display panel or a lighting panel for a large-sized television where low power consumption is desired.
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Abstract
Description
nは1~3の整数であり、
HArは下記式(2)で表される基である。)
式(3)においてR21~R28の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R21~R28のいずれか1つは単結合であり、Lと結合しており、R24とR25が結合して置換もしくは無置換のメチレン基を形成する場合を除く。
式(4)においてR31~R38の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R31~R38のいずれか1つは単結合であり、Lと結合している。
式(5)においてR41~R47の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R41~R47のいずれか1つは単結合であり、Lと結合している。
式(6)においてR51~R57の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R51~R57のいずれか1つは単結合であり、Lと結合しており、R53とR54が結合して置換もしくは無置換のメチレン基を形成する場合を除く。
式(7)においてR61~R66の2個以上が結合して環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R61~R66のいずれか1つは単結合であり、Lと結合している。)
具体的には、フッ素原子、メチル基、1-、2-又は3-ピリジル基、トリメチルシリル基、メトキシ基、シアノ基、1-又は2-ナフチル基、2-、3-又は4-メトキシフェニル基、2-、3-又は4-トリメチルシリルフェニル基、2-、3-又は4-シアノフェニル基、2-ピリミジル基、2-トリアジニル基、3-又は4-ビピリジル基などが挙げられる。
このように、本発明のベンゾ[k]フルオランテン誘導体は、電子注入・輸送機能及び3重項エネルギー障壁機能(トリプレット障壁機能)の両方を備える化合物である。
障壁材料のトリプレット障壁機能は、トリプレット障壁構造部位によって主として決定される。一般に、発光層で生成された3重項励起子が、隣接する障壁材料へそのエネルギーを遷移させる場合、障壁材料の各構造部位のうち、最も低い3重項エネルギーを有する構造部位に3重項エネルギーが遷移する。このことから、各構造部位のうち最も低い3重項エネルギーを有するトリプレット障壁構造部位が縮合多環芳香族炭化水素化合物である場合、障壁材料はトリプレット障壁機能を効果的に発揮する。以上の理由より、化合物に含まれる構造部位の中で3重項エネルギーが最も低くなる(小さい)構造部位が炭素と水素から構成されていない場合は、当該化合物はトリプレット障壁構造部位を有しないこととなる。
有機EL素子に電圧を印加すると、陽極、陰極から電子と正孔が注入され、注入された電子と正孔は発光層内で再結合し励起子を生成する。そのスピン状態は、1重項励起子が25%、3重項励起子が75%である。従来知られている蛍光素子においては、1重項励起子が基底状態に緩和するときに光を発するが、残りの3重項励起子については光を発することなく熱的失活過程を経て基底状態に戻る。しかしながら、S.M.Bachiloらによれば(J.Phys.Cem.A,104,7711(2000))、当初生成した75%の3重項励起子のうち、1/5が1重項励起子に変化する。
TTF現象とは3重項励起子の衝突融合により1重項励起子が生成する現象であり、このTTF現象を利用すれば、当初生成する25%の1重項励起子だけでなく、3重項励起子の衝突融合により生じる1重項励起子も発光に利用でき、素子の発光効率を高めることができる。
本発明では、本発明のベンゾ[k]フルオランテン誘導体を含有する障壁層を蛍光素子の発光層に隣接させることが好ましい。本発明のベンゾ[k]フルオランテン誘導体を含んでなる障壁層を蛍光素子に用いることによってTTF現象を引き起こし、高効率な有機EL素子を実現することができると考えられる。
尚、本発明の障壁層は3重項エネルギーに対する障壁機能を有する層であり、正孔障壁層及び電荷障壁層とはその機能が異なる。
還元性ドーパントとしては、ドナー性金属、ドナー性金属化合物及びドナー性金属錯体が挙げられ、これら還元性ドーパントは1種単独で使用してもよいし、2種以上を組み合わせて使用してもよい。
ここで、還元性ドーパントとは、電子を供与する材料(電子供与性材料という)である。この電子供与性材料は、当該電子供与性材料と共に障壁層、電子注入層又は電子輸送層に含まれる他の有機材料、もしくは障壁層、電子注入層又は電子輸送層に隣接する層を構成する有機材料と相互作用し、ラジカルアニオンを生じさせる材料、又は電子供与性ラジカルを有する材料である。
ドナー性金属化合物とは、上記のドナー性金属を含む化合物であり、好ましくはアルカリ金属、アルカリ土類金属又は希土類金属を含む化合物であり、より好ましくはこれらの金属のハロゲン化物、酸化物、炭酸塩、ホウ酸塩である。例えば、MOx(Mはドナー性金属、xは0.5~1.5)、MFx(xは1~3)、M(CO3)x(xは0.5~1.5)で表される化合物である。
ETb>ETh・・・(1)
ETd>ETh・・・(2)
(ETh、ETb及びETdは、それぞれホスト材料、障壁層の含窒素複素環誘導体及びドーパントの3重項エネルギーを示す。)
本発明のベンゾ[k]フルオランテン誘導体を含む障壁層は、電子注入・輸送機能の役割も果たすことができるので、障壁材料に注入された電子は、電子輸送構造部位を介してより電子を供与しやすい。即ちLUMO準位の高い構造部位へと移動することによって、発光層への電子注入に寄与することとなる。
R101~R108は、それぞれ独立に、水素原子、置換若しくは無置換の環形成原子数5~50の単環基、置換若しくは無置換の環形成原子数8~50の縮合環基、単環基と縮合環基との組合せから構成される基、置換若しくは無置換の炭素数1~50のアルキル基、置換若しくは無置換の環形成炭素数3~50のシクロアルキル基、置換若しくは無置換の炭素数1~50のアルコキシ基、置換若しくは無置換の炭素数7~50のアラルキル基、置換若しくは無置換の環形成炭素数6~50のアリールオキシ基、置換若しくは無置換のシリル基、ハロゲン原子、シアノ基から選ばれる基である。)
環形成原子数5~50(好ましくは5~30、より好ましくは5~20)の単環基として具体的には、フェニル基、ビフェニル基、ターフェニル基、クォーターフェニル基等の芳香族基、ピリジル基、ピラジル基、ピリミジル基、トリアジニル基、フリル基、チエニル基等の複素環基が挙げられ、フェニル基、ビフェニル基、ターフェニル基が好ましい。
前記環形成原子数8~50(好ましくは8~30、より好ましくは8~20)の縮合環基として具体的には、ナフチル基、フェナントリル基、アントリル基、クリセニル基、ベンゾアントリル基、ベンゾフェナントリル基、トリフェニレニル基、ベンゾクリセニル基、インデニル基、フルオレニル基、9,9-ジメチルフルオレニル基、ベンゾフルオレニル基、ジベンゾフルオレニル基、フルオランテニル基、ベンゾフルオランテニル基等の縮合芳香族環基や、ベンゾフラニル基、ベンゾチオフェニル基、インドリル基、ジベンゾフラニル基、ジベンゾチオフェニル基、カルバゾリル基、キノリル基、フェナントロリニル基等の縮合複素環基が挙げられ、ナフチル基、フェナントリル基、アントリル基、9,9-ジメチルフルオレニル基、フルオランテニル基、ベンゾアントリル基、ジベンゾチオフェニル基、ジベンゾフラニル基、カルバゾリル基が好ましい。
炭素数7~50のアラルキル基は-Y-Zと表され、Yの例として上記のアルキルの例に対応するアルキレンの例が挙げられ、Zの例として上記のアリールの例が挙げられる。炭素数7~50アラルキル基のアリール部分は炭素数6~49(好ましくは6~30、より好ましくは6~20、特に好ましくは6~12)、アルキル部分は炭素数1~44(好ましくは1~30、より好ましくは1~20、さらに好ましくは1~10、特に好ましくは1~6))であり、例えばベンジル基、フェニルエチル基、2-フェニルプロパン-2-イル基である。
当該アントラセン誘導体は、式(4)におけるAr11及びAr12が、それぞれ独立に、置換若しくは無置換の環形成原子数8~50の縮合環基となっている。当該アントラセン誘導体としては、Ar11及びAr12が同一の置換若しくは無置換の縮合環基である場合、及び異なる置換若しくは無置換の縮合環基である場合に分けることができる。
当該アントラセン誘導体は、式(4)におけるAr11及びAr12の一方が置換若しくは無置換の環形成原子数5~50の単環基であり、他方が置換若しくは無置換の環形成原子数8~50の縮合環基となっている。
好ましい形態として、Ar12がナフチル基、フェナントリル基、ベンゾアントリル基、9,9-ジメチルフルオレニル基、ジベンゾフラニル基であり、Ar11が単環基又は縮合環基が置換されたフェニル基である。
好ましい単環基、縮合環基の具体的な基は上述した通りである。
別の好ましい形態として、Ar12が縮合環基であり、Ar11が無置換のフェニル基である。この場合、縮合環基として、フェナントリル基、9,9-ジメチルフルオレニル基、ジベンゾフラニル基、ベンゾアントリル基が特に好ましい。
当該アントラセン誘導体は、式(4)におけるAr11及びAr12が、それぞれ独立に、置換若しくは無置換の環形成原子数5~50の単環基となっている。
好ましい形態として、Ar11、Ar12ともに置換若しくは無置換のフェニル基である。
さらに好ましい形態として、Ar11が無置換のフェニル基であり、Ar12が単環基、縮合環基を置換基として持つフェニル基である場合と、Ar11、Ar12がそれぞれ独立に単環基、縮合環基を置換基として持つフェニル基である場合がある。
前記置換基としての好ましい単環基、縮合環基の具体例は上述した通りである。さらに好ましくは、置換基としての単環基としてフェニル基、ビフェニル基、縮合環基として、ナフチル基、フェナントリル基、9,9-ジメチルフルオレニル基、ジベンゾフラニル基、ベンゾアントリル基である。
L101及びL102は、それぞれ独立に、置換もしくは無置換の環形成炭素数6~30の2価のアリール基または複素環基を示す。
mは0~1の整数、nは1~4の整数、sは0~1の整数、tは0~3の整数である。
また、L101又はAr111はピレンの1~5位のいずれかに結合し、L102又はAr222はピレンの6~10位のいずれかに結合する。)
また、この置換基としては、式(1)における「置換もしくは無置換の・・・」における置換基と同様である。L101及びL102の置換基は、好ましくは、炭素数1~20のアルキル基である。
一般式(5)におけるtは、好ましくは0~2の整数である。
Ar111及びAr222のアリール基は、式(1)における各基と同様である。
好ましくは、置換もしくは無置換の環形成炭素数6~20のアリール基、より好ましくは、置換もしくは無置換の環形成炭素数6~16のアリール基、アリール基の好ましい具体例としては、フェニル基、ナフチル基、フェナントリル基、フルオレニル基、ビフェニル基、アントリル基、ピレニル基である。
上記蛍光性ドーパントは一重項励起子から発光することのできる化合物である。蛍光性ドーパントとしては、アミン系化合物、芳香族化合物、トリス(8-キノリノラト)アルミニウム錯体等のキレート錯体、クマリン誘導体、テトラフェニルブタジエン誘導体、ビススチリルアリーレン誘導体、オキサジアゾール誘導体等から、要求される発光色に合わせて選ばれる化合物であることが好ましく、スチリルアミン化合物、スチリルジアミン化合物、アリールアミン化合物、アリールジアミン化合物、芳香族化合物がより好ましく、縮合多環アミン誘導体、芳香族化合物がさらに好ましい。これらの蛍光性ドーパントは単独でもまた複数組み合わせて使用してもよい。
Ar101、Ar102は、それぞれ置換もしくは無置換の環形成炭素数6~50のアリール基、又は置換もしくは無置換の環形成原子数5~50の複素環基を示す。
Yの具体例としては、前述した縮合アリール基が挙げられ、好ましくは置換もしくは無置換のアントリル基、置換もしくは無置換のピレニル基、置換もしくは無置換のクリセニル基である。
Ar101、Ar102の具体例としては、前述したアリール基又は複素環基が挙げられ、好ましくは置換もしくは無置換のフェニル基、置換もしくは無置換のナフチル基、置換もしくは無置換のビフェニル基、置換もしくは無置換のターフェニル基、置換もしくは無置換のジベンゾフラニル基である。
nは1~4の整数である。nは1~2の整数であることが好ましい。)
X307及びX312は、それぞれ独立に、置換もしくは無置換の環形成炭素数6~30のアリール基、置換もしくは無置換の環形成原子数5~30の複素環基、置換もしくは無置換の炭素数1~20のアルキル基、及び置換もしくは無置換の環形成炭素数3~8のシクロアルキル基から選ばれる。
但し、X303とX304は、互いに異なる置換基である。
また、X301~X312において、隣接する置換基同士は互いに結合して飽和もしくは不飽和の環状構造を形成してもよく、これら環状構造は置換されてもよい。)
主ピーク波長とは、発光スペクトラムにおける発光強度が最大となる発光スペクトルのピーク波長をいい、主ピーク波長550nmとは緑色発光程度に相当する。当該波長領域ではTTF現象を利用した蛍光発光素子の発光効率の向上が望まれる。480nm以下の青色発光を示す蛍光発光素子においては、より高い発光効率の向上が期待できる。
5-ブロモアセナフテン25.4g(107.3mmol)、脱水ベンゼン500mlに、2,3-ジクロロ-5,6-ジシアノ-1,4-ベンゾキノン(DDQ)29.2g(128.7mmol)を加え、加熱還流下、6時間攪拌した。さらに、反応混合物にDDQ6.0g(26.4mmol)を加え、4時間加熱攪拌した。放冷後、沈殿物を濾別し、クロロホルムで洗浄した。濾液を合わせて、10%水酸化ナトリウム水溶液、水で洗浄した。分液後、有機相を無水硫酸ナトリウムで乾燥し、溶媒を留去した。減圧下、乾燥し、褐色の固体、5-ブロモアセナフチレン13.0g(収率51.6%)を得た。
1,3-ジフェニルイソベンゾフラン14.9g(55.2mmol)、5-ブロモ-アセナフチレン12.8g(55.2mmol)及びトルエン50mlの混合物を加熱還流下、16時間攪拌した。溶媒を留去後、酢酸1200mlを加え、80℃に加熱した。この混合物に、48%HBr水溶液150mlを加え、80℃にて1時間攪拌した。室温まで冷却後、沈殿物を濾取し、メタノールで洗浄した。得られた黄色固体をトルエン200mlで再結晶化した。結晶を濾取し、黄色固体、3-ブロモ-7,12-ジフェニルベンゾ[k]フルオランテン19.8g(収率:74%)を得た。
3-ブロモ-7,12-ジフェニルベンゾ[k]フルオランテン30.8g(64.0mmol)を脱水テトラヒドロフラン400ml、脱水トルエン300mlに溶解させ、-70℃に冷却し、n-ブチルリチウム44.6ml(70.4mmol)を滴下して1時間撹拌し、トリイソプリピルボロン酸エステル44.0ml(192mmol)を加え、2時間かけて室温まで昇温した。10%塩酸200mlを加え、2時間撹拌した。沈殿物を濾取し、トルエンで洗浄し、減圧下、乾燥し、黄色の固体、7,12-ジフェニルベンゾ[k]フルオランテン-3-イルボロン酸25.14g(収率88%)を得た。
(c)4-(4-ブロモフェニル)-2-フェニル-6-(2-ピリジル)ピリミジンの合成
下記スキームにしたがって、4-(4-ブロモフェニル)-2-フェニル-6-(2-ピリジル)ピリミジンの合成を行った。
アルゴン雰囲気下、4-ブロモベンズアルデヒド25.3g(137mmol)のエタノール(500ml)溶液に2-アセチルピリジン15.6ml(139mmol)およびナトリウムメトキシド25.3g(28%メタノール溶液、131mmol)を加え、室温にて8時間攪拌を行った。生成した固体をろ取しメタノールで洗浄して、白色固体、(E)-3-(4-ブロモフェニル)-1-(2-ピリジル)-2-プロペン-1-オン、13.1g(収率33%)を得た。
アルゴン雰囲気下、(E)-3-(4-ブロモフェニル)-1-(2-ピリジル)-2-プロペン-1-オン13.0g(45.1mmol)のエタノール160ml溶液に、ベンズアミジン塩酸塩7.3g(46.6mmol)および水酸化ナトリウム3.6g(90mmol)を加え、16時間加熱還流撹拌した。反応混合物を室温に冷却後、生成した固体をろ取し、水、メタノールで洗浄し、薄茶色固体、4-(4-ブロモフェニル)-2-フェニル-6-(2-ピリジル)ピリミジン4.31g(収率25%)を得た。
下記方法で、化合物1及び2の下記物性値を測定した。測定結果を表1に示す。
(1)三重項エネルギー(ET)
市販の装置F-4500(日立社製)を用いて測定した。ETの換算式は、以下の通りである。
ET(eV)=1239.85/λedge
「λedge」とは、縦軸がりん光強度、横軸が波長であるりん光スペクトルにおいて、りん光スペクトルの短波長側の立ち上がり部分に接線を引き、その接線と横軸の交点の波長値を意味する。単位:nm。
大気下光電子分光装置(理研計器(株)社製:AC-3)を用いて測定した。具体的には、材料に光を照射し、その際に電荷分離によって生じる電子量を測定することにより求めた。
イオン化ポテンシャルとエネルギーギャップの測定値から算出した。エネルギーギャップは化合物1又は2のトルエン溶液の吸収スペクトルの吸収端から測定した。具体的には、市販の可視・紫外分光光度計を用いて吸収スペクトルを測定し、そのスペクトルが立ち上がり始める波長(吸収端)から算出した。
(1)有機EL素子の製造
25mm×75mm×1.1mm厚のITO透明電極(陽極)付きガラス基板(ジオマティック社製)をイソプロピルアルコール中で超音波洗浄を5分間行なった後、UVオゾン洗浄を30分間行なった。
洗浄後の透明電極ライン付きガラス基板を真空蒸着装置の基板ホルダーに装着し、まず透明電極ラインを覆うようにして膜厚50nmの化合物HT-1を成膜した。HT-1膜は正孔注入層として機能する。続けて、化合物HT-2を蒸着してHT-1膜上に膜厚45nmのHT-2膜を成膜した。HT-2膜は正孔輸送層として機能する。
HT-2膜上に化合物BH-1(ホスト材料)及び化合物BD-1(ドーパント材料)を20:1の膜厚比で蒸着し、膜厚25nmの有機層を成膜した。この有機層は発光層として機能する。発光層の上に化合物1を蒸着して膜厚25nmの電子輸送層を形成した。この後、LiFを膜厚1nmで成膜した。このLiF膜上に金属Alを80nm蒸着させ金属陰極を形成し有機EL発光素子を作製した。
作製した有機EL素子について、電流密度10mA/cm2における駆動時の素子性能(駆動電圧、発光効率及び発光色)、及び電流密度8mA/cm2において輝度が5%減少するまでの時間(輝度95%寿命)を測定した。結果を表2に示す。
有機EL素子の製造と評価
化合物1の代わりに化合物2(実施例5)、ET-1(比較例1)又はET-2(比較例2)を用いて電子輸送層を形成した以外は実施例3と同様にして有機EL素子を作製し評価した。結果を表2に示す。
25mm×75mm×1.1mm厚のITO透明電極(陽極)付きガラス基板(ジオマティック社製)をイソプロピルアルコール中で超音波洗浄を5分間行なった後、UVオゾン洗浄を30分間行なった。
洗浄後の透明電極ライン付きガラス基板を真空蒸着装置の基板ホルダーに装着し、まず透明電極ラインを覆うようにして膜厚50nmの化合物HT-1を成膜した。HT-1膜は正孔注入層として機能する。続けて、化合物HT-2を蒸着してHT-1膜上に膜厚45nmのHT-2膜を成膜した。HT-2膜は正孔輸送層として機能する。
HT-2膜上に化合物BH-1(ホスト材料)及び化合物BD-1(ドーパント材料)を20:1の膜厚比で蒸着し、膜厚25nmの発光層を成膜した。発光層の上に化合物1とリチウムキノリノラート(Liq)を1:1の膜厚比で蒸着して、発光層上に膜厚25nmの電子輸送層を形成した。この電子輸送層上に金属Alを80nm蒸着させ金属陰極を形成し有機EL素子を作製した。
得られた有機EL素子を実施例3と同様にして評価した。結果を表3に示す。
有機EL素子の製造と評価
化合物1の代わりに化合物2(実施例8)、化合物3(実施例9)、ET-1(比較例3)又はET-2(比較例4)を用いて電子輸送層を形成した以外は実施例7と同様にして有機EL素子を作製し評価した。結果を表3に示す。
有機EL素子の製造と評価
BD-1の代わりにBD-2を用いて発光層を形成した他は実施例7と同様にして有機EL素子を作製し、評価した。結果を表3に示す。
効率・寿命・低電圧を同時に達成することは困難な技術であるが、本発明の実施例の結果から、化合物1~化合物3を用いることで、従来達成困難であった課題を解決することができた。
また、ベンゾフルオランテン環のアフィニティ(Af)が大きいことから、電子輸送層をリチウムキノレートとの共蒸着層とした際にも、駆動電圧が低い値となっていることが分かる。
化合物1~化合物3は、高い発光効率を実現しているが、この高効率の要因として、障壁材の効果が関与している可能性が示唆される。ホスト材料のBH-1の3重項エネルギーは、化合物1~化合物3と同様の方法で算出すると1.8eVであり、化合物1~化合物3の値はこれと比べ十分に大きいことから、発光層内への3重項励起子の閉じ込め効果が生じていることが考えられる。
Claims (10)
- 下記式(1)で表されるベンゾ[k]フルオランテン誘導体。
nは1~3の整数であり、
HArは下記式(2)で表される構造である。)
2つ以上のR13同士が結合して、置換もしくは無置換の飽和又は不飽和の基を形成してもよい。但し、X4とX5がCR13であって、該R13同士が結合して置換もしくは無置換のメチレン基を形成する場合を除く。) - HArが下記式(3)~(7)で表される含窒素複素環のひとつである請求項1に記載のベンゾ[k]フルオランテン誘導体。
式(3)においてR21~R28の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R21~R28のいずれか1つは単結合であり、Lと結合しており、R24とR25が結合して置換もしくは無置換のメチレン基を形成する場合を除く。
式(4)においてR31~R38の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R31~R38のいずれか1つは単結合であり、Lと結合している。
式(5)においてR41~R47の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R41~R47のいずれか1つは単結合であり、Lと結合している。
式(6)においてR51~R57の2個以上が結合して、環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R51~R57のいずれか1つは単結合であり、Lと結合しており、R53とR54が結合して置換もしくは無置換のメチレン基を形成する場合を除く。
式(7)においてR61~R66の2個以上が結合して環を形成する置換もしくは無置換の飽和又は不飽和の基を形成してもよい。ただし、R61~R66のいずれか1つは単結合であり、Lと結合している。) - nが1である請求項1~3のいずれか1項に記載のベンゾ[k]フルオランテン誘導体。
- 請求項1~4のいずれか1項に記載のベンゾ[k]フルオランテン誘導体を含む有機エレクトロルミネッセンス素子用材料。
- 前記有機エレクトロルミネッセンス素子用材料が、電子注入材料又は電子輸送材料である請求項5に記載の有機エレクトロルミネッセンス素子用材料。
- 陰極と陽極の間に発光層を含む1層以上の有機薄膜層が挟持されている有機エレクトロルミネッセンス素子において、前記有機薄膜層の少なくとも1層が、請求項1~4のいずれか1項に記載のベンゾ[k]フルオランテン誘導体を1種以上含有する有機エレクトロルミネッセンス素子。
- 前記有機薄膜層が電子注入層又は電子輸送層であり、前記電子注入層又は電子輸送層が、請求項1~4のいずれか1項に記載のベンゾ[k]フルオランテン誘導体を1種以上含有する請求項7に記載の有機エレクトロルミネッセンス素子。
- 前記ベンゾ[k]フルオランテン誘導体を含有する電子注入層又は電子輸送層が、還元性ドーパントをさらに含有する請求項8に記載の有機エレクトロルミネッセンス素子。
- 前記還元性ドーパントが、アルカリ金属、アルカリ土類金属、希土類金属、アルカリ金属の酸化物、アルカリ金属のハロゲン化物、アルカリ土類金属の酸化物、アルカリ土類金属のハロゲン化物、希土類金属の酸化物、希土類金属のハロゲン化物、アルカリ金属の有機錯体、アルカリ土類金属の有機錯体及び希土類金属の有機錯体からなる群から選択される1種以上である請求項9に記載の有機エレクトロルミネッセンス素子。
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KR1020127008614A KR101429832B1 (ko) | 2010-10-08 | 2011-10-07 | 벤조〔k〕플루오란텐 유도체 및 그것을 포함하여 이루어지는 유기 전기발광 소자 |
US13/504,575 US9273002B2 (en) | 2010-10-08 | 2011-10-07 | Benzo[k]fluoranthene derivative and organic electroluminescence device containing the same |
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JPWO2012046839A1 (ja) | 2014-02-24 |
TW201215659A (en) | 2012-04-16 |
US20120211743A1 (en) | 2012-08-23 |
EP2626346A4 (en) | 2014-03-19 |
CN102574797B (zh) | 2017-03-01 |
JP5909179B2 (ja) | 2016-04-26 |
EP2626346A1 (en) | 2013-08-14 |
CN102574797A (zh) | 2012-07-11 |
KR20130025858A (ko) | 2013-03-12 |
KR101429832B1 (ko) | 2014-08-12 |
US9273002B2 (en) | 2016-03-01 |
EP2626346B1 (en) | 2018-01-10 |
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