WO2009151039A1 - 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
- Publication number
- WO2009151039A1 WO2009151039A1 PCT/JP2009/060490 JP2009060490W WO2009151039A1 WO 2009151039 A1 WO2009151039 A1 WO 2009151039A1 JP 2009060490 W JP2009060490 W JP 2009060490W WO 2009151039 A1 WO2009151039 A1 WO 2009151039A1
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- WO
- WIPO (PCT)
- Prior art keywords
- group
- substituted
- organic
- unsubstituted aromatic
- unsubstituted
- Prior art date
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- -1 arylamine compound Chemical class 0.000 claims abstract description 67
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims abstract description 28
- 230000005525 hole transport Effects 0.000 claims abstract description 25
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims abstract description 22
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 21
- 125000006617 triphenylamine group Chemical group 0.000 claims abstract description 18
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 14
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 14
- 125000001309 chloro group Chemical group Cl* 0.000 claims abstract description 14
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 14
- 125000001153 fluoro group Chemical group F* 0.000 claims abstract description 14
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 claims abstract description 12
- 125000004093 cyano group Chemical group *C#N 0.000 claims abstract description 11
- ROFVEXUMMXZLPA-UHFFFAOYSA-N Bipyridyl Chemical group N1=CC=CC=C1C1=CC=CC=N1 ROFVEXUMMXZLPA-UHFFFAOYSA-N 0.000 claims abstract description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 7
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 12
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 12
- 238000005401 electroluminescence Methods 0.000 claims description 9
- 125000001424 substituent group Chemical group 0.000 claims description 9
- 125000003342 alkenyl group Chemical group 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 25
- 239000010409 thin film Substances 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 87
- 150000001875 compounds Chemical class 0.000 description 47
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 18
- 239000012298 atmosphere Substances 0.000 description 15
- 238000005259 measurement Methods 0.000 description 15
- 125000005504 styryl group Chemical group 0.000 description 9
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 8
- 125000001624 naphthyl group Chemical group 0.000 description 8
- 125000005561 phenanthryl group Chemical group 0.000 description 8
- 125000001725 pyrenyl group Chemical group 0.000 description 8
- 239000012043 crude product Substances 0.000 description 7
- 239000012044 organic layer Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 125000004196 benzothienyl group Chemical group S1C(=CC2=C1C=CC=C2)* 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 125000003454 indenyl group Chemical group C1(C=CC2=CC=CC=C12)* 0.000 description 6
- 125000001041 indolyl group Chemical group 0.000 description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- 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 6
- 125000004076 pyridyl group Chemical group 0.000 description 6
- 125000000714 pyrimidinyl group Chemical group 0.000 description 6
- 125000005493 quinolyl group Chemical group 0.000 description 6
- 125000001567 quinoxalinyl group Chemical group N1=C(C=NC2=CC=CC=C12)* 0.000 description 6
- 125000004062 acenaphthenyl group Chemical group C1(CC2=CC=CC3=CC=CC1=C23)* 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
- 125000000499 benzofuranyl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 description 5
- 125000001164 benzothiazolyl group Chemical group S1C(=NC2=C1C=CC=C2)* 0.000 description 5
- 125000004541 benzoxazolyl group Chemical group O1C(=NC2=C1C=CC=C2)* 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010408 film Substances 0.000 description 5
- 125000002541 furyl group Chemical group 0.000 description 5
- 125000004593 naphthyridinyl group Chemical group N1=C(C=CC2=CC=CN=C12)* 0.000 description 5
- 125000004309 pyranyl group Chemical group O1C(C=CC=C1)* 0.000 description 5
- 125000003226 pyrazolyl group Chemical group 0.000 description 5
- 150000003222 pyridines Chemical class 0.000 description 5
- 125000001544 thienyl group Chemical group 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 4
- 125000005509 dibenzothiophenyl group Chemical group 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
- 239000000843 powder Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 4
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Natural products C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 3
- VKOLBYNBPONPAE-UHFFFAOYSA-N 2-[3,5-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical compound O1C(C)(C)C(C)(C)OB1C1=CC(B2OC(C)(C)C(C)(C)O2)=CC(B2OC(C)(C)C(C)(C)O2)=C1 VKOLBYNBPONPAE-UHFFFAOYSA-N 0.000 description 3
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 3
- 108091006149 Electron carriers Proteins 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
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- ZEEBGORNQSEQBE-UHFFFAOYSA-N [2-(3-phenylphenoxy)-6-(trifluoromethyl)pyridin-4-yl]methanamine Chemical compound C1(=CC(=CC=C1)OC1=NC(=CC(=C1)CN)C(F)(F)F)C1=CC=CC=C1 ZEEBGORNQSEQBE-UHFFFAOYSA-N 0.000 description 3
- LJHFUFVRZNYVMK-CYBMUJFWSA-N [3-[4-(aminomethyl)-6-(trifluoromethyl)pyridin-2-yl]oxyphenyl]-[(3R)-3-hydroxypyrrolidin-1-yl]methanone Chemical compound NCC1=CC(=NC(=C1)C(F)(F)F)OC=1C=C(C=CC=1)C(=O)N1C[C@@H](CC1)O LJHFUFVRZNYVMK-CYBMUJFWSA-N 0.000 description 3
- 125000000641 acridinyl group Chemical group C1(=CC=CC2=NC3=CC=CC=C3C=C12)* 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 150000004982 aromatic amines Chemical class 0.000 description 3
- IPWKHHSGDUIRAH-UHFFFAOYSA-N bis(pinacolato)diboron Chemical compound O1C(C)(C)C(C)(C)OB1B1OC(C)(C)C(C)(C)O1 IPWKHHSGDUIRAH-UHFFFAOYSA-N 0.000 description 3
- 238000004440 column chromatography Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 239000003480 eluent Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 125000004625 phenanthrolinyl group Chemical group N1=C(C=CC2=CC=C3C=CC=NC3=C12)* 0.000 description 3
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
- BGXZWVJYHNOQMR-UHFFFAOYSA-N 2-[3,5-bis(6-pyridin-2-ylpyridin-2-yl)phenyl]-6-pyridin-2-ylpyridine Chemical compound N1=CC=CC=C1C1=CC=CC(C=2C=C(C=C(C=2)C=2N=C(C=CC=2)C=2N=CC=CC=2)C=2N=C(C=CC=2)C=2N=CC=CC=2)=N1 BGXZWVJYHNOQMR-UHFFFAOYSA-N 0.000 description 2
- CUNDWXAGHMYTKE-UHFFFAOYSA-N 2-[3-[3,5-bis(6-pyridin-2-ylpyridin-2-yl)phenyl]-5-(6-pyridin-2-ylpyridin-2-yl)phenyl]-6-pyridin-2-ylpyridine Chemical group N1=CC=CC=C1C1=CC=CC(C=2C=C(C=C(C=2)C=2C=C(C=C(C=2)C=2N=C(C=CC=2)C=2N=CC=CC=2)C=2N=C(C=CC=2)C=2N=CC=CC=2)C=2N=C(C=CC=2)C=2N=CC=CC=2)=N1 CUNDWXAGHMYTKE-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
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- 125000002490 anilino group Chemical group [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 150000002430 hydrocarbons Chemical group 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- KZPYGQFFRCFCPP-UHFFFAOYSA-N 1,1'-bis(diphenylphosphino)ferrocene Chemical compound [Fe+2].C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1 KZPYGQFFRCFCPP-UHFFFAOYSA-N 0.000 description 1
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical group NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 description 1
- YWDUZLFWHVQCHY-UHFFFAOYSA-N 1,3,5-tribromobenzene Chemical compound BrC1=CC(Br)=CC(Br)=C1 YWDUZLFWHVQCHY-UHFFFAOYSA-N 0.000 description 1
- FXJXZYWFJAXIJX-UHFFFAOYSA-N 1,3-dibromo-5-(3,5-dibromophenyl)benzene Chemical group BrC1=CC(Br)=CC(C=2C=C(Br)C=C(Br)C=2)=C1 FXJXZYWFJAXIJX-UHFFFAOYSA-N 0.000 description 1
- PYSPHJZICRIMEI-UHFFFAOYSA-N 2-[3-[3,5-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane Chemical group O1C(C)(C)C(C)(C)OB1C1=CC(B2OC(C)(C)C(C)(C)O2)=CC(C=2C=C(C=C(C=2)B2OC(C)(C)C(C)(C)O2)B2OC(C)(C)C(C)(C)O2)=C1 PYSPHJZICRIMEI-UHFFFAOYSA-N 0.000 description 1
- NOECZPHCYMKZOF-UHFFFAOYSA-N 2-bromo-6-(6-pyridin-2-ylpyridin-2-yl)pyridine Chemical compound BrC1=CC=CC(C=2N=C(C=CC=2)C=2N=CC=CC=2)=N1 NOECZPHCYMKZOF-UHFFFAOYSA-N 0.000 description 1
- 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 1
- GOLORTLGFDVFDW-UHFFFAOYSA-N 3-(1h-benzimidazol-2-yl)-7-(diethylamino)chromen-2-one Chemical compound C1=CC=C2NC(C3=CC4=CC=C(C=C4OC3=O)N(CC)CC)=NC2=C1 GOLORTLGFDVFDW-UHFFFAOYSA-N 0.000 description 1
- LZPWAYBEOJRFAX-UHFFFAOYSA-N 4,4,5,5-tetramethyl-1,3,2$l^{2}-dioxaborolane Chemical compound CC1(C)O[B]OC1(C)C LZPWAYBEOJRFAX-UHFFFAOYSA-N 0.000 description 1
- 101150003085 Pdcl gene Proteins 0.000 description 1
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical group C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 1
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 1
- REAYFGLASQTHKB-UHFFFAOYSA-N [2-[3-(1H-pyrazol-4-yl)phenoxy]-6-(trifluoromethyl)pyridin-4-yl]methanamine Chemical compound N1N=CC(=C1)C=1C=C(OC2=NC(=CC(=C2)CN)C(F)(F)F)C=CC=1 REAYFGLASQTHKB-UHFFFAOYSA-N 0.000 description 1
- CUJRVFIICFDLGR-UHFFFAOYSA-N acetylacetonate Chemical compound CC(=O)[CH-]C(C)=O CUJRVFIICFDLGR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
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- 239000004305 biphenyl Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- ZADPBFCGQRWHPN-UHFFFAOYSA-N boronic acid Chemical compound OBO ZADPBFCGQRWHPN-UHFFFAOYSA-N 0.000 description 1
- RQROZNWAYYQBOG-UHFFFAOYSA-N c1cc(-c2cc(-c3ncccc3)nc(-c(cc3cc4)cnc3c(nc3)c4cc3-c3nc(-c4ccccn4)cc(-c4ccccn4)c3)c2)ncc1 Chemical compound c1cc(-c2cc(-c3ncccc3)nc(-c(cc3cc4)cnc3c(nc3)c4cc3-c3nc(-c4ccccn4)cc(-c4ccccn4)c3)c2)ncc1 RQROZNWAYYQBOG-UHFFFAOYSA-N 0.000 description 1
- AJNYMOZVGHVWKV-UHFFFAOYSA-N c1cc(-c2cccc(-c3cc(-c4cc(-c5cccc(-c6ccccn6)n5)cc(-c5ccccn5)n4)nc(-c4ncccc4)c3)n2)ncc1 Chemical compound c1cc(-c2cccc(-c3cc(-c4cc(-c5cccc(-c6ccccn6)n5)cc(-c5ccccn5)n4)nc(-c4ncccc4)c3)n2)ncc1 AJNYMOZVGHVWKV-UHFFFAOYSA-N 0.000 description 1
- MRETYUUVVHECEF-UHFFFAOYSA-N c1cc(-c2nc(-c(c(-c3nc(-c4ccccn4)ccc3)c3)cc(-c4nc(-c5ccccn5)ccc4)c3-c3nc(-c4ncccc4)ccc3)ccc2)ncc1 Chemical compound c1cc(-c2nc(-c(c(-c3nc(-c4ccccn4)ccc3)c3)cc(-c4nc(-c5ccccn5)ccc4)c3-c3nc(-c4ncccc4)ccc3)ccc2)ncc1 MRETYUUVVHECEF-UHFFFAOYSA-N 0.000 description 1
- FSLVPEPKAGDCLC-UHFFFAOYSA-N c1cc(-c2nc(-c3cc(-c4cc(-c5cccc(-c6cccc(-c7ccccn7)n6)c5)nc(-c5cccc(-c6nc(-c7ncccc7)ccc6)c5)c4)ccc3)ccc2)ncc1 Chemical compound c1cc(-c2nc(-c3cc(-c4cc(-c5cccc(-c6cccc(-c7ccccn7)n6)c5)nc(-c5cccc(-c6nc(-c7ncccc7)ccc6)c5)c4)ccc3)ccc2)ncc1 FSLVPEPKAGDCLC-UHFFFAOYSA-N 0.000 description 1
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- JVZRCNQLWOELDU-UHFFFAOYSA-N gamma-Phenylpyridine Natural products C1=CC=CC=C1C1=CC=NC=C1 JVZRCNQLWOELDU-UHFFFAOYSA-N 0.000 description 1
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- 150000004820 halides Chemical class 0.000 description 1
- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical compound [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 1
- 150000002503 iridium Chemical class 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 150000007978 oxazole derivatives Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 235000011056 potassium acetate Nutrition 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
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000007979 thiazole derivatives Chemical class 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- C07D401/14—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 three or more hetero rings
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- 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
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- H05B33/00—Electroluminescent light sources
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Definitions
- the present invention relates to an organic electroluminescence element which is a self-luminous element suitable for various display devices. Specifically, the present invention relates to an organic electroluminescence element using an arylamine derivative and a pyridine derivative (hereinafter abbreviated as an organic EL element). .).
- organic EL elements are self-luminous elements, they have been actively researched because they are brighter and more visible than liquid crystal elements and are capable of clear display.
- JP-A-8-48656 Japanese Patent No. 3194657
- Non-Patent Document 2 the use of triplet excitons has been attempted for the purpose of further improving the luminous efficiency, and the use of phosphorescent compounds has been studied (for example, see Non-Patent Document 2).
- the light emitting layer can also be produced by doping a charge transporting compound generally called a host material with a fluorescent compound or a phosphorescent compound.
- a charge transporting compound generally called a host material
- a fluorescent compound or a phosphorescent compound.
- selection of an organic material in an organic EL element greatly affects various characteristics such as efficiency and durability of the element (see Non-patent document 2).
- the light injected from both electrodes is recombined in the light emitting layer to obtain light emission.
- positive and negative charges are obtained. It is necessary to provide an element with excellent carrier balance in which holes are injected and transported efficiently and recombined.
- phthalocyanines such as copper phthalocyanine (hereinafter abbreviated as CuPc) have been proposed as hole-injecting materials used in organic EL devices (see, for example, Patent Document 3).
- a material having a phenylenediamine structure has been widely used (for example, see Patent Document 4).
- arylamine-based materials containing a benzidine skeleton have been used as hole transport materials (see, for example, Patent Document 5).
- Tris (8-hydroxyquinoline) aluminum (hereinafter abbreviated as Alq), which is a typical light emitting material, is generally used as an electron transport material, but has a generally used hole transport material. Since the electron mobility of Alq is lower than that of hole mobility, and the work function of Alq is 5.8 eV, it cannot be said that there is sufficient hole blocking ability, so some of the holes pass through the light emitting layer. And efficiency will be reduced.
- the ionization potential value and electron affinity value of the material are set in stages, and the hole injection layer and the electron injection layer respectively.
- Patent Document 6 an element in which two or more layers are stacked has been developed (see, for example, Patent Document 6), it cannot be said that the materials used are sufficient in any of light emission efficiency, drive voltage, and element lifetime.
- the object of the present invention is to combine various materials for organic EL elements excellent in hole and electron injection / transport performance, thin film stability and durability, and achieve high efficiency, low driving voltage, and long life organic EL. It is to provide an element.
- the physical characteristics of the organic compound suitable for the present invention include (1) good hole and electron injection characteristics, (2) fast movement speed of holes and electrons, and (3) electrons and holes. It can be mentioned that it has excellent blocking ability, (4) that the thin film state is stable, and (5) that it has excellent heat resistance.
- the physical characteristics of the element suitable for the present invention include (1) high luminous efficiency, (2) low emission start voltage, (3) low practical driving voltage, and (4) long life. Can be said.
- the present inventors have demonstrated that the arylamine-based material is excellent in hole injection and transport capability, thin film stability and durability, and pyridine derivatives having electron affinity. Focusing on the excellent electron injection and transport capability, thin film stability and durability, various organic ELs selected from specific arylamine compounds and specific pyridine derivatives and combined to achieve carrier balance As a result of producing an element and intensively evaluating the characteristics of the element, the present invention was completed.
- the following organic EL elements are provided.
- the hole injection layer has three or more triphenylamine structures in the molecule.
- the hole transport layer contains an arylamine compound having two triphenylamine structures in the molecule, and the electron transport layer is substituted by the following general formula (1):
- An organic electroluminescence device comprising a bipyridyl compound.
- R 1 to R 7 may be the same or different and each represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, or a linear or branched alkyl group having 1 to 6 carbon atoms
- n1 represents an integer of 2 to 4
- a 1 represents A divalent to tetravalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent to tetravalent group of a substituted or unsubstituted aromatic heterocyclic ring, a divalent to tetravalent group of a substituted or unsubstituted condensed polycyclic aromatic, or Trivalent group represented by general formula (2)
- R 8 to R 19 may be the same or different, and are a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, and the number of carbon atoms.
- n2 represents an integer of 1 to 3
- R 20 to R 25 may be the same or different from each other, fluorine atom, chlorine atom, cyano group, trifluoromethyl group, linear or branched alkyl group having 1 to 6 carbon atoms, carbon atom number) 1 to 6 linear or branched alkenyl groups, substituted or unsubstituted aromatic hydrocarbon groups, substituted or unsubstituted aromatic heterocyclic groups, or substituted or unsubstituted condensed polycyclic aromatic groups, In the case where a plurality of these substituents are bonded to the same benzene ring, they may form a ring with each other, r 20 to r 25 represent 0 or an integer of 1 to 4, and A 5 represents the following structure (It represents a divalent group represented by formulas (B) to (F) or a single bond.)
- n2 represents an integer of 1 to 3
- R 26 to R 32 may be the same or different and each represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, or a linear or branched alkyl group having 1 to 6 carbon atoms
- n3 represents an integer of 3 or 4
- a 6 represents Represents a trivalent or tetravalent group of a substituted or unsubstituted aromatic hydrocarbon, a trivalent or tetravalent group of a substituted or unsubstituted aromatic heterocyclic ring, a trivalent or tetravalent group of a substituted or unsubstituted condensed polycyclic aromatic .
- Specific examples of the hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group include the following groups. From these groups, 1 to 3 hydrogen atoms are further reduced to form divalent to tetravalent groups.
- Substituent for substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group or substituted or unsubstituted condensed polycyclic aromatic group represented by A 1 in general formula (1) Specific examples include a fluorine atom, a chlorine atom, a cyano group, a hydroxyl group, a nitro group, a linear or branched alkyl group having 1 to 6 carbon atoms, and further substituted May be.
- Aromatic hydrocarbon group substituted or unsubstituted aromatic heterocyclic group, substituted or unsubstituted, substituted or unsubstituted aromatic hydrocarbon group represented by R 1 to R 7 in general formula (1)
- Specific examples of the condensed polycyclic aromatic group include phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, styryl group, naphthyl group, anthryl group, acenaphthenyl group, fluorenyl group, phenanthryl group, indenyl group, pyrenyl group, pyridyl group.
- substituent for are fluorine atom, chlorine atom, trifluoromethyl group, linear or branched alkyl group having 1 to 6 carbon atoms, phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, Styryl, naphthyl, fluorenyl, phenanthryl, indenyl, pyrenyl, pyridyl, bipyridyl, pyrimidyl, quinolyl, isoquinolyl, indolyl, carbazolyl, quinoxalyl, pyrazolyl, Further, it may be substituted.
- aromatic hydrocarbon group aromatic heterocyclic group or condensed polycyclic aromatic group, specifically, phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, styryl group, naphthyl group, anthryl group, acenaphthenyl group, Fluorenyl, phenanthryl, indenyl, pyrenyl, pyridyl, pyrimidyl, furanyl, pyranyl, thiophenyl, quinolyl, isoquinolyl, benzofuranyl, benzothiophenyl, indolyl, carbazolyl, benzoxazolyl Group, benzothiazolyl group,
- substituent for are fluorine atom, chlorine atom, trifluoromethyl group, linear or branched alkyl group having 1 to 6 carbon atoms, phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, Examples thereof include a styryl group, a naphthyl group, a fluorenyl group, a phenanthryl group, an indenyl group, and a pyrenyl group, which may be further substituted.
- aromatic hydrocarbon group aromatic heterocyclic group or condensed polycyclic aromatic group, specifically, phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, styryl group, naphthyl group, anthryl group, acenaphthenyl group, Fluorenyl, phenanthryl, indenyl, pyrenyl, pyridyl, pyrimidyl, furanyl, pyranyl, thiophenyl, quinolyl, isoquinolyl, benzofuranyl, benzothiophenyl, indolyl, carbazolyl, benzoxazolyl Group, benzothiazolyl
- substituent for are fluorine atom, chlorine atom, trifluoromethyl group, linear or branched alkyl group having 1 to 6 carbon atoms, phenyl group, biphenylyl group, terphenylyl group, tetrakisphenyl group, Examples thereof include a styryl group, a naphthyl group, a fluorenyl group, a phenanthryl group, an indenyl group, and a pyrenyl group, which may be further substituted.
- Specific examples of the hydrocarbon group, aromatic heterocyclic group or condensed polycyclic aromatic group include the following groups. From these groups, 2 or 3 hydrogen atoms are further reduced to form a trivalent or tetravalent group.
- Substituent for the substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group or substituted or unsubstituted condensed polycyclic aromatic group represented by A 6 in the general formula (5) Specific examples include a fluorine atom, a chlorine atom, a cyano group, a hydroxyl group, a nitro group, a linear or branched alkyl group having 1 to 6 carbon atoms, and further substituted May be.
- the substituted bipyridyl compound represented by the general formula (1) or the general formula (5) used in the organic EL device of the present invention may be used as a constituent material of the electron transport layer of the organic EL device. it can.
- An arylamine compound having two phenylamine structures can be used as a constituent material of a hole injection layer or a hole transport layer of an organic EL device.
- the arylamine compound having three or more triphenylamine structures in the molecule represented by the general formula (3) is an arylamine compound having two triphenylamine structures in the molecule represented by the general formula (4). Compared with the above, it has a high hole mobility and is a preferred compound as a material for the hole injection layer.
- the organic EL element of the present invention combines materials for organic EL elements that are excellent in hole / electron injection / transport performance, thin film stability and durability in consideration of carrier balance. Compared to EL elements, the hole transport efficiency to the hole transport layer is improved, and the electron transport efficiency from the electron transport layer to the light emitting layer is also improved, so that the light emission efficiency is improved and the driving voltage is reduced. The durability of the organic EL element can be improved. It has become possible to realize organic EL elements with high efficiency, low drive voltage, and long life.
- the organic EL device of the present invention selects a specific arylamine compound and a specific pyridine derivative excellent in hole and electron injection / transport performance, thin film stability and durability, and is combined so that carrier balance can be achieved, An organic EL element with high efficiency, low drive voltage, and long life can be realized. Luminous efficiency and driving voltage and durability of conventional organic EL elements can be improved.
- the substituted bipyridyl compound represented by the general formula (1) or the general formula (5) used in the organic EL device of the present invention includes, for example, various aromatic hydrocarbon compounds and condensed polycyclic aromatic compounds.
- a boronic acid or boronic acid ester synthesized by a reaction of a halide of a compound or an aromatic heterocyclic compound with pinacol borane or bis (pinacolato) diboron see, for example, Non-Patent Document 3
- pinacol borane or bis (pinacolato) diboron see, for example, Non-Patent Document 3
- various halogenopyridines are used in a Suzuki cup.
- a substituted bipyridyl compound can be synthesized by performing a cross-coupling reaction such as a ring (see, for example, Non-Patent Document 4).
- An arylamine compound having three or more triphenylamine structures in the molecule represented by the general formula (3) or a trimethylamine in the molecule represented by the general formula (4) used in the organic EL device of the present invention An arylamine compound having two phenylamine structures can be synthesized by a known method. (For example, see Patent Documents 7 to 9)
- an anode (transparent electrode) 2 As the structure of the organic EL device of the present invention, an anode (transparent electrode) 2, a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport are sequentially formed on a glass substrate 1 as shown in FIG. Examples include a layer 7, an electron injection layer 8, and a cathode 9, and a layer having a hole blocking layer 6 between the light emitting layer 5 and the electron transport layer 7 as shown in FIG. 1.
- several organic layers can be omitted.
- an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode are sequentially formed on a glass substrate. You can also.
- an electrode material having a large work function such as ITO or gold is used as the anode of the organic EL element of the present invention.
- an arylamine compound having high hole mobility and having three or more triphenylamine structures in the molecule is used as the hole injection layer.
- an arylamine compound having two triphenylamine structures in the molecule is used as the hole transport layer.
- the light emitting layer and hole blocking layer of the organic EL device of the present invention aluminum complexes, styryl derivatives, thiazole derivatives, oxazole derivatives, carbazole derivatives, polydialkylfluorene derivatives, and the like are used. Further, as a host material for the light emitting layer, for example, a phosphor such as quinacridone, coumarin, or rubrene can be used.
- Examples of phosphorescent emitters include green phosphorescent emitters such as iridium complexes of phenylpyridine (Ir (PPy) 3 ), blue phosphorescent emitters such as FIrpic and FIr6, and red phosphorescent emitters such as Btp 2 Ir (acac).
- green phosphorescent emitters such as iridium complexes of phenylpyridine (Ir (PPy) 3
- blue phosphorescent emitters such as FIrpic and FIr6
- red phosphorescent emitters such as Btp 2 Ir (acac).
- CBP hole injecting / transporting host material 4,4′-di (N-carbazolyl) biphenyl
- a substituted bipyridyl compound can also be used.
- a substituted bipyridyl compound is used as the electron transport layer of the organic EL device of the present invention.
- the organic EL device of the present invention may have an electron injection layer as shown in FIGS.
- the electron injection layer lithium fluoride or the like can be used.
- an electrode material having a low work function such as aluminum or an alloy having a lower work function such as aluminum magnesium is used as the electrode material.
- the organic EL element has a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, and an electron transport layer on a glass substrate 1 on which an ITO electrode is previously formed as a transparent anode 2. 7, an electron injection layer 8 and a cathode (aluminum electrode) 9 were deposited in this order.
- the glass substrate 1 on which ITO having a thickness of 150 nm was formed was subjected to ultrasonic cleaning in isopropyl alcohol for 20 minutes, and then subjected to boiling cleaning for 20 minutes on a hot plate heated to 150 ° C. Then, this glass substrate with ITO was attached in a vacuum vapor deposition machine, and after performing oxygen plasma treatment for 5 minutes, the pressure was reduced to 0.001 Pa or less.
- a compound 3-1 having the following structural formula was formed to a thickness of 20 nm as a hole injection layer 3 so as to cover the transparent electrode 2.
- a compound 4-1 having the following structural formula was formed as the hole transport layer 4 so as to have a film thickness of 40 nm.
- a compound 1-8 having the following structural formula was formed as an electron transport layer 7 to a thickness of 30 nm.
- lithium fluoride was formed as the electron injection layer 8 so as to have a film thickness of 0.5 nm.
- 150 nm of aluminum was deposited to form the cathode 9.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3 except that Compound 1-2 having the following structural formula was formed to a thickness of 30 nm instead of Compound 1-8 as the electron transport layer 7.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3 except that the compound 1-3 having the following structural formula was formed to a thickness of 30 nm instead of the compound 1-8 as the electron transport layer 7.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 1-6 having the following structural formula was formed to a thickness of 30 nm instead of Compound 1-8 as the electron transport layer 7.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3 except that Compound 1-18 having the following structural formula was formed to a thickness of 30 nm instead of Compound 1-8 as the electron transport layer 7.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 3-4 having the following structural formula was formed to a thickness of 20 nm instead of Compound 3-1 as hole injection layer 3.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 3-6 having the following structural formula was formed to a thickness of 20 nm in place of Compound 3-1 as hole injection layer 3.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 3-14 having the following structural formula was formed to a thickness of 20 nm in place of Compound 3-1 as hole injection layer 3.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3 except that the hole injection layer 3 was formed by replacing the compound 3-1 with a compound 3-15 having the following structural formula so as to have a film thickness of 20 nm.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 4-4 having the following structural formula was formed to a thickness of 40 nm instead of Compound 4-1 as the hole transport layer 4.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 4-6 having the following structural formula was formed to a film thickness of 40 nm instead of Compound 4-1 as hole transport layer 4.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 4-9 having the following structural formula was formed to a thickness of 40 nm instead of Compound 4-1 as the hole transport layer 4.
- the characteristic measurement was performed by applying DC voltage in air
- An organic EL device was produced in the same manner as in Example 3, except that Compound 4-13 having the following structural formula was formed to a thickness of 40 nm instead of Compound 4-1 as the hole transport layer 4.
- the characteristic measurement was performed by applying DC voltage in air
- Example 1 An organic EL device was produced in the same manner as in Example 3 except that Alq was formed to a thickness of 30 nm as the electron transport layer 7 instead of the compound 1-8. About the produced organic EL element, the characteristic measurement was performed by applying DC voltage in air
- Comparative Example 2 An organic EL device was produced in the same manner as in Comparative Example 1 except that CuPc was formed to a thickness of 20 nm instead of the compound 3-1 as the hole injection layer 3. About the produced organic EL element, the characteristic measurement was performed by applying DC voltage in air
- the organic EL device of the present invention improves the carrier balance inside the organic EL device by combining a specific arylamine compound and a specific substituted bipyridyl compound, and compared with a conventional organic EL device using CuPc and Alq. Thus, it was found that an organic EL element having a low driving voltage and a long lifetime can be realized.
- the organic EL device of the present invention which combines a specific arylamine compound and a specific pyridine derivative, can improve the light emission efficiency and reduce the driving voltage, thereby improving the durability of the organic EL device. It has become possible to expand into home appliances and lighting applications.
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Abstract
Description
1.少なくとも陽極電極、正孔注入層、正孔輸送層、発光層、電子輸送層及び陰極電極をこの順に有する有機エレクトロルミネッセンス素子において、前記正孔注入層が分子中にトリフェニルアミン構造を3個以上有するアリールアミン化合物を含有し、前記正孔輸送層が分子中にトリフェニルアミン構造を2個有するアリールアミン化合物を含有し、かつ前記電子輸送層が下記一般式(1)で表される置換されたビピリジル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。
本発明の有機EL素子に用いられる、前記一般式(3)で表される分子中にトリフェニルアミン構造を3個以上有するアリールアミン化合物または前記一般式(4)で表される分子中にトリフェニルアミン構造を2個有するアリールアミン化合物は、有機EL素子の正孔注入層または正孔輸送層の構成材料として使用することができる。
前記一般式(3)で表される分子中にトリフェニルアミン構造を3個以上有するアリールアミン化合物は前記一般式(4)で表される分子中にトリフェニルアミン構造を2個有するアリールアミン化合物と比較して、正孔の移動度が高く正孔注入層の材料として好ましい化合物である。
高効率、低駆動電圧、長寿命の有機EL素子を実現することが可能となった。
正孔注入層としては、正孔の移動度が高い、分子中にトリフェニルアミン構造を3個以上有するアリールアミン化合物が用いられる。
正孔輸送層としては、分子中にトリフェニルアミン構造を2個有するアリールアミン化合物が用いられる。
また、発光層のホスト材料として、例えば、キナクリドン、クマリン、ルブレンなどの蛍光体を用いることができる。燐光発光体としては、フェニルピリジンのイリジウム錯体(Ir(PPy)3)などの緑色の燐光発光体、FIrpic、FIr6などの青色の燐光発光体、Btp2Ir(acac)などの赤色の燐光発光体などが用いられ、このときのホスト材料としては正孔注入・輸送性のホスト材料4,4’-ジ(N-カルバゾリル)ビフェニル(以後、CBPと略称する)などを用いることによっても、高性能の有機EL素子を作製することができる。
陰極としては、アルミニウムのような仕事関数の低い電極材料や、アルミニウムマグネシウムのような、より仕事関数の低い合金が電極材料として用いられる。
窒素雰囲気下、反応容器に1,3,5-トリブロモベンゼン8.6g、ビス(ピナコラート)ジボロン(PIN2B2)25.0g、酢酸カリウム24.1g、予めモレキュラーシーブス4Aで脱水したジメチルスルホキシド250ml、PdCl2(dppf)-CH2Cl21.35gを加えて加熱し、80℃で20時間撹拌を行った。室温まで冷却した後、反応液を水1000mlに加え、30分撹拌した。ろ過によって析出物をろ別し、析出物をメタノール洗浄した。粗製物を酢酸エチル200mlに溶解させ、不溶物をろ過によって除き、ろ液を濃縮乾固することによって1,3,5-トリス(4,4,5,5-テトラメチル-[1,3,2]ジオキサボロラン-2-イル)ベンゼン7.1g(収率57%)の白色粉体を得た。
前記実施例1と同様に、3,5,3’,5’-テトラブロモビフェニルとビス(ピナコラート)ジボロンから3,5,3’,5’-テトラキス(4,4,5,5-テトラメチル-[1,3,2]ジオキサボロラン-2-イル)ビフェニルを合成した。得られた3,5,3’,5’-テトラキス(4,4,5,5-テトラメチル-[1,3,2]ジオキサボロラン-2-イル)ビフェニル3.2g、6-ブロモ-2,2’-ビピリジン4.5g、2M炭酸カリウム水溶液28.7ml、テトラキス(トリフェニルホスフィン)パラジウム(0)0.3g、トルエン110ml、エタノール25mlを窒素置換した反応容器に加え、攪拌しながら22時間加熱還流した。室温まで冷却し、水100ml、クロロホルム300mlを加えて分液し、有機層をさらに水100mlで洗浄した。有機層を無水硫酸マグネシウムで脱水した後、濃縮することによって粗製物を得た。粗製物をカラムクロマトグラフ(担体:NHシリカゲル、溶離液:クロロホルム/n-ヘキサン)によって精製し、3,5,3’,5’-テトラキス(2,2’-ビピリジン-6-イル)ビフェニル(化合物1-18)2.4g(収率64%)の白色粉末を得た。
(1,3,5-トリス(2,2’-ビピリジン-6-イル)ベンゼン(化合物1-2)の合成)
実施例1で得られた、前記1,3,5-トリス(4,4,5,5-テトラメチル-[1,3,2]ジオキサボロラン-2-イル)ベンゼン2.5g、6-ブロモ-2,2’-ビピリジン3.8g、1M炭酸カリウム水溶液32.3ml、テトラキス(トリフェニルホスフィン)パラジウム(0)0.32g、トルエン108ml、エタノール27mlを窒素雰囲気下、反応容器に加え、攪拌しながら18時間加熱還流した。室温まで冷却し、水100ml、トルエン100mlを加えて分液し、有機層をさらに水100mlで洗浄した。有機層を無水硫酸マグネシウムで脱水した後、濃縮することによって粗製物を得た。粗製物をカラムクロマトグラフ(担体:NHシリカゲル、溶離液:クロロホルム/n-ヘキサン)によって精製し、1,3,5-トリス(2,2’-ビピリジン-6-イル)ベンゼン(化合物1-2)1.1g(収率38%)の白色粉末を得た。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.70Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.68Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.78Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.73Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.75Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.77Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.95Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.88Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.85Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.74Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.82Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.81Vであった。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、3.76Vであった。
実施例3において、電子輸送層7として化合物1-8に代えてAlqを膜厚30nmとなるように形成した以外は、同様の方法で有機EL素子を作製した。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、5.43Vであった。
比較例1において、正孔注入層3として化合物3-1に代えてCuPcを膜厚20nmとなるように形成した以外は、同様の方法で有機EL素子を作製した。
作製した有機EL素子について、大気中、常温下で直流電圧を印加することによって特性測定を行なった。その結果、電流密度10mA/cm2の電流を流したときの駆動電圧は、8.30Vであった。
2 透明陽極
3 正孔注入層
4 正孔輸送層
5 発光層
6 正孔阻止層
7 電子輸送層
8 電子注入層
9 陰極
Claims (4)
- 少なくとも陽極電極、正孔注入層、正孔輸送層、発光層、電子輸送層及び陰極電極をこの順に有する有機エレクトロルミネッセンス素子において、前記正孔注入層が分子中にトリフェニルアミン構造を3個以上有するアリールアミン化合物を含有し、前記正孔輸送層が分子中にトリフェニルアミン構造を2個有するアリールアミン化合物を含有し、かつ前記電子輸送層が下記一般式(1)で表される置換されたビピリジル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。
(式中、R1~R7は、同一でも異なってもよく水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、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し、n1は2ないし4の整数を表し、A1は置換もしくは無置換の芳香族炭化水素の2~4価基、置換もしくは無置換の芳香族複素環の2~4価基、置換もしくは無置換の縮合多環芳香族の2~4価基または下記一般式(2)で表される3価基
(式中、X、Y、Zは炭素原子または窒素原子を表す。)を表す。ただし、n1=2の場合、2つのビピリジル構造同士が直接結合することができるものとし、そのときA1は基ではない。) - 前記正孔注入層に含有される前記分子中にトリフェニルアミン構造を3個以上有するアリールアミン化合物が、下記一般式(3)で表されるアリールアミン化合物である請求項1記載の有機エレクトロルミネッセンス素子。
(式中、R8~R19は同一でも異なってもよくフッ素原子、塩素原子、シアノ基、トリフルオロメチル基、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、炭素原子数1ないし6の直鎖状もしくは分岐状のアルケニル基、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であって、これらの置換基が同一のベンゼン環に複数個結合している場合は互いに環を形成していても良い。r8~r19は0または1~4の整数を表し、A2、A3、A4は同一でも異なってもよく、下記構造式(B)~(F)で示される2価基、または単結合を表す。)
(式中、n2は1~3の整数を表す。)
- 前記正孔輸送層に含有される前記分子中にトリフェニルアミン構造を2個有するアリールアミン化合物が、下記一般式(4)で表されるアリールアミン化合物である請求項1または2に記載の有機エレクトロルミネッセンス素子。
(式中、R20~R25は同一でも異なってもよくフッ素原子、塩素原子、シアノ基、トリフルオロメチル基、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、炭素原子数1ないし6の直鎖状もしくは分岐状のアルケニル基、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であって、これらの置換基が同一のベンゼン環に複数個結合している場合は互いに環を形成していても良い。r20~r25は0または1~4の整数を表し、A5は下記構造式(B)~(F)で示される2価基、または単結合を表す。)
(式中、n2は1~3の整数を表す。)
- 前記置換されたビピリジル化合物が、下記一般式(5)で表されるアリールアミン化合物である請求項1~3のいずれかに記載の有機エレクトロルミネッセンス素子。
(式中、R26~R32は、同一でも異なってもよく水素原子、フッ素原子、塩素原子、シアノ基、トリフルオロメチル基、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し、n3は3または4の整数を表し、A6は置換もしくは無置換の芳香族炭化水素の2~4価基、置換もしくは無置換の芳香族複素環の2~4価基、置換もしくは無置換の縮合多環芳香族の2~4価基を表す。)
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Also Published As
Publication number | Publication date |
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JPWO2009151039A1 (ja) | 2011-11-17 |
JP5373787B2 (ja) | 2013-12-18 |
KR20110030544A (ko) | 2011-03-23 |
EP2299510A1 (en) | 2011-03-23 |
CN102057514B (zh) | 2016-03-30 |
US20120161107A1 (en) | 2012-06-28 |
EP2299510A4 (en) | 2012-03-28 |
US8716698B2 (en) | 2014-05-06 |
CN102057514A (zh) | 2011-05-11 |
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