JP4849812B2 - Organic electroluminescent device and silicon compound - Google Patents
Organic electroluminescent device and silicon compound Download PDFInfo
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- JP4849812B2 JP4849812B2 JP2005086258A JP2005086258A JP4849812B2 JP 4849812 B2 JP4849812 B2 JP 4849812B2 JP 2005086258 A JP2005086258 A JP 2005086258A JP 2005086258 A JP2005086258 A JP 2005086258A JP 4849812 B2 JP4849812 B2 JP 4849812B2
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- 150000003377 silicon compounds Chemical class 0.000 title description 3
- 150000001875 compounds Chemical class 0.000 claims description 84
- 239000010410 layer Substances 0.000 claims description 72
- -1 R 42 Chemical compound 0.000 claims description 69
- 125000003118 aryl group Chemical group 0.000 claims description 41
- 125000001424 substituent group Chemical group 0.000 claims description 26
- 239000012044 organic layer Substances 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 238000005401 electroluminescence Methods 0.000 claims description 11
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 11
- 125000001072 heteroaryl group Chemical group 0.000 claims description 9
- 125000005678 ethenylene group Chemical group [H]C([*:1])=C([H])[*:2] 0.000 claims description 8
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 claims description 6
- 125000000732 arylene group Chemical group 0.000 claims description 4
- 125000002529 biphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C12)* 0.000 claims description 4
- 125000005549 heteroarylene group Chemical group 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 125000004957 naphthylene group Chemical group 0.000 claims description 3
- 125000005551 pyridylene group Chemical group 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 68
- 238000000034 method Methods 0.000 description 57
- 239000000463 material Substances 0.000 description 36
- 229910052751 metal Inorganic materials 0.000 description 24
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- 238000002347 injection Methods 0.000 description 20
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- VLKZOEOYAKHREP-UHFFFAOYSA-N methyl pentane Natural products CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 15
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 6
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- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 6
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 6
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- UWRZIZXBOLBCON-VOTSOKGWSA-N (e)-2-phenylethenamine Chemical compound N\C=C\C1=CC=CC=C1 UWRZIZXBOLBCON-VOTSOKGWSA-N 0.000 description 3
- 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 3
- BCMCBBGGLRIHSE-UHFFFAOYSA-N 1,3-benzoxazole Chemical compound C1=CC=C2OC=NC2=C1 BCMCBBGGLRIHSE-UHFFFAOYSA-N 0.000 description 3
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- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
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- 239000004698 Polyethylene Substances 0.000 description 3
- 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 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 150000001491 aromatic compounds Chemical class 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052741 iridium Inorganic materials 0.000 description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical group [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- 235000019341 magnesium sulphate Nutrition 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 125000001624 naphthyl group Chemical group 0.000 description 3
- 229960003540 oxyquinoline Drugs 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
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- 239000008096 xylene Substances 0.000 description 3
- KLCLIOISYBHYDZ-UHFFFAOYSA-N 1,4,4-triphenylbuta-1,3-dienylbenzene Chemical compound C=1C=CC=CC=1C(C=1C=CC=CC=1)=CC=C(C=1C=CC=CC=1)C1=CC=CC=C1 KLCLIOISYBHYDZ-UHFFFAOYSA-N 0.000 description 2
- GUPMCMZMDAGSPF-UHFFFAOYSA-N 1-phenylbuta-1,3-dienylbenzene Chemical compound C=1C=CC=CC=1[C](C=C[CH2])C1=CC=CC=C1 GUPMCMZMDAGSPF-UHFFFAOYSA-N 0.000 description 2
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 2
- XWIYUCRMWCHYJR-UHFFFAOYSA-N 1h-pyrrolo[3,2-b]pyridine Chemical compound C1=CC=C2NC=CC2=N1 XWIYUCRMWCHYJR-UHFFFAOYSA-N 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229940126062 Compound A Drugs 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-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
- ZCQWOFVYLHDMMC-UHFFFAOYSA-N Oxazole Chemical compound C1=COC=N1 ZCQWOFVYLHDMMC-UHFFFAOYSA-N 0.000 description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 229920000265 Polyparaphenylene Polymers 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
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- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 2
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- 125000004397 aminosulfonyl group Chemical group NS(=O)(=O)* 0.000 description 2
- XJHABGPPCLHLLV-UHFFFAOYSA-N benzo[de]isoquinoline-1,3-dione Chemical compound C1=CC(C(=O)NC2=O)=C3C2=CC=CC3=C1 XJHABGPPCLHLLV-UHFFFAOYSA-N 0.000 description 2
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- 229910052731 fluorine Inorganic materials 0.000 description 2
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- 125000005843 halogen group Chemical group 0.000 description 2
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- 230000008018 melting Effects 0.000 description 2
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- 238000001451 molecular beam epitaxy Methods 0.000 description 2
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 2
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- 125000002030 1,2-phenylene group Chemical group [H]C1=C([H])C([*:1])=C([*:2])C([H])=C1[H] 0.000 description 1
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 description 1
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- 125000001140 1,4-phenylene group Chemical group [H]C1=C([H])C([*:2])=C([H])C([H])=C1[*:1] 0.000 description 1
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- SULWTXOWAFVWOY-PHEQNACWSA-N 2,3-bis[(E)-2-phenylethenyl]pyrazine Chemical compound C=1C=CC=CC=1/C=C/C1=NC=CN=C1\C=C\C1=CC=CC=C1 SULWTXOWAFVWOY-PHEQNACWSA-N 0.000 description 1
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- 125000004974 2-butenyl group Chemical group C(C=CC)* 0.000 description 1
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 125000001494 2-propynyl group Chemical group [H]C#CC([H])([H])* 0.000 description 1
- BCHZICNRHXRCHY-UHFFFAOYSA-N 2h-oxazine Chemical compound N1OC=CC=C1 BCHZICNRHXRCHY-UHFFFAOYSA-N 0.000 description 1
- 125000000590 4-methylphenyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 1
- NNWNNQTUZYVQRK-UHFFFAOYSA-N 5-bromo-1h-pyrrolo[2,3-c]pyridine-2-carboxylic acid Chemical compound BrC1=NC=C2NC(C(=O)O)=CC2=C1 NNWNNQTUZYVQRK-UHFFFAOYSA-N 0.000 description 1
- LCGTWRLJTMHIQZ-UHFFFAOYSA-N 5H-dibenzo[b,f]azepine Chemical compound C1=CC2=CC=CC=C2NC2=CC=CC=C21 LCGTWRLJTMHIQZ-UHFFFAOYSA-N 0.000 description 1
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- 238000001228 spectrum Methods 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical compound C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 235000021286 stilbenes Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 125000000213 sulfino group Chemical group [H]OS(*)=O 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 125000006296 sulfonyl amino group Chemical group [H]N(*)S(*)(=O)=O 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 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
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
Description
本発明は、電気エネルギーを光に変換して発光できる有機電界発光素子に関する。 The present invention relates to an organic electroluminescent element capable of emitting light by converting electric energy into light.
今日、種々の表示素子に関する研究開発が活発であり、中でも有機電界発光(EL)素子(以下、EL素子、発光素子、または本発明の発光素子と称することがある)は、低電圧で高輝度の発光を得ることができるため、有望な表示素子として注目されている。 Today, research and development on various display elements are active, and among them, an organic electroluminescence (EL) element (hereinafter, sometimes referred to as an EL element, a light emitting element, or a light emitting element of the present invention) has high luminance at a low voltage. Therefore, it is attracting attention as a promising display element.
素子耐久性を改良するために、特許文献1に特定のシラン化合物およびこれらを含有する発光素子が提案され、該特許文献中に(4−25)、(4−26)、(4−27)、(4−28)が開示されているが、これらを用いた素子についてもさらなる耐久性向上が求められていた。
本発明の目的は、発光特性、素子駆動耐久性、および保存安定性が良好な有機電界発光素子およびこのような素子を実現することを可能にする化合物の提供にある。 An object of the present invention is to provide an organic electroluminescence device having good light emission characteristics, device driving durability, and storage stability, and a compound that makes it possible to realize such a device.
この課題は下記手段によって達成された。
(1)一対の電極間に、発光層を含む少なくとも一層の有機層を有する有機電界発光素子であって、前記有機層中に下記一般式(1)で表される化合物を少なくとも1種含む有機電界発光素子。
This object has been achieved by the following means.
(1) An organic electroluminescent device having at least one organic layer including a light emitting layer between a pair of electrodes, wherein the organic layer contains at least one compound represented by the following general formula (1) Electroluminescent device.
(式中、R11、R12は互いに独立にアリール基、ヘテロアリール基を表すが、R11、R12がフェニル基である場合、R11、R12上に置換基として含窒素へテロ環基を有することはない。Ar11、Ar12は互いに独立に一般式(2)で表される基を表す。) (In the formula, R 11 and R 12 each independently represents an aryl group or a heteroaryl group. When R 11 and R 12 are phenyl groups, nitrogen-containing heterocycles are substituted on R 11 and R 12 as substituents. (Ar 11 and Ar 12 each independently represent a group represented by the general formula (2).)
(式中、Ar21はアリーレン基またはヘテロアリーレン基を表し、R21、R22、R23 、R24はそれぞれ独立に置換基または水素原子を表す。L2は置換もしくは無置換のo−アリーレン、ビニレン、−NR−(Rは置換基を表す)、−O−、または、−S−を表し、mは0または1を表す。ただし、Ar 21 がフェニレン基である場合、mは1である。)
(2)一般式(1)において、R11、およびR12が無置換アリール基、または無置換ヘテロアリール基である請求項1記載の有機電界発光素子。
(3)一般式(2)において、mが1である(1)または(2)項に記載の有機電界発光素子。
(4)一般式(2)において、mが1であり、かつL2が置換もしくは無置換のo−アリーレン、またはビニレンである(1)〜(3)項のいずれか1項に記載の有機電界発光素子。
(5)前記一般式(1)で表される化合物が、下記一般式(4)で表される化合物であることを特徴とする(1)項に記載の有機電界発光素子。
(In the formula, Ar 21 represents an arylene group or a heteroarylene group, R 21 , R 22 , R 23 , and R 24 each independently represents a substituent or a hydrogen atom. L 2 represents a substituted or unsubstituted o-arylene. , Vinylene, -NR- (R represents a substituent), -O-, or -S-, and m represents 0 or 1. However, when Ar 21 is a phenylene group, m is 1. Yes. )
(2) The organic electroluminescent device according to claim 1, wherein, in the general formula (1), R 11 and R 12 are an unsubstituted aryl group or an unsubstituted heteroaryl group.
(3) The organic electroluminescent element according to the item (1) or (2), wherein m is 1 in the general formula (2).
(4) The organic according to any one of (1) to (3) , wherein in general formula (2), m is 1 and L 2 is a substituted or unsubstituted o-arylene or vinylene. Electroluminescent device.
(5) The compound represented by the general formula (1), characterized in that a compound represented by the SL one general formula (4) (1) The organic electroluminescent device according to item.
(6)一般式(2)において、mが0であり、Ar 21 がビフェニレン基、ナフチレン基、アントラニレン基、ピリジレン基である(1)または(2)項に記載の有機電界発光素子。
(7)一般式(4)で表される化合物。
(6) In the general formula (2), m Ri is 0 der, Ar 21 is a biphenylene group, naphthylene group, anthranylene group, a pyridylene group (1) or (2) The organic electroluminescent device according to item.
(7) compounds represented by a general formula (4).
(式中、R 41、R42、R43、R44、R45、R46はそれぞれ独立にアルキル基、アリール基、互いに結合して芳香環を形成する基を表す。g、hはそれぞれ独立に0から4の整数を表す。i、jはそれぞれ独立に0から2の整数を表す。k、lはそれぞれ独立に0〜5の整数を表す。)
(In the formula , R 41 , R 42 , R 43 , R 44 , R 45 , and R 46 each independently represent an alkyl group, an aryl group, or a group that combines with each other to form an aromatic ring. G and h are each independently. And i and j each independently represent an integer from 0 to 2. k and l each independently represent an integer from 0 to 5. )
本発明の発光素子は発光特性、耐久性が優れる。 The light emitting device of the present invention is excellent in light emitting characteristics and durability.
本発明の好ましい実施態様は、一対の電極間に、発光層を含む少なくとも一層の有機層を有する有機電界発光素子であって、前記有機層中に下記一般式(1)で表される化合物を少なくとも1種含む有機電界発光素子である。 A preferred embodiment of the present invention is an organic electroluminescent device having at least one organic layer including a light emitting layer between a pair of electrodes, wherein the compound represented by the following general formula (1) is contained in the organic layer. It is an organic electroluminescent element containing at least one kind.
一般式(1)について説明する。R11、R12はアリール基、またはヘテロアリール基を表す。R11、R12として好ましくは単環、2環、および3環のアリール基またはヘテロアリール基であり、さらに好ましくはフェニル基、ナフチル基、ピリジル基、カルバゾリル基であり、最も好ましくはフェニル基である。R11、R12は置換基を有しても良い。R11、R12がフェニル基である場合、R11、R12上に置換基として含窒素へテロ環基を有することはない。置換基としては、好ましくは以下の置換基Aが挙げられる。 The general formula (1) will be described. R 11 and R 12 represent an aryl group or a heteroaryl group. R 11 and R 12 are preferably monocyclic, bicyclic, and tricyclic aryl groups or heteroaryl groups, more preferably phenyl groups, naphthyl groups, pyridyl groups, and carbazolyl groups, and most preferably phenyl groups. is there. R 11 and R 12 may have a substituent. When R 11 and R 12 are phenyl groups, they do not have a nitrogen-containing heterocyclic group as a substituent on R 11 and R 12 . Preferred examples of the substituent include the following substituent A.
(置換基A)
アルキル基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜10であり、例えばメチル、エチル、iso−プロピル、tert−ブチル、n−オクチル、n−デシル、n−ヘキサデシル、シクロプロピル、シクロペンチル、シクロヘキシルなどが挙げられる。)、アルケニル基(好ましくは炭素数2〜30、より好ましくは炭素数2〜20、特に好ましくは炭素数2〜10であり、例えばビニル、アリル、2−ブテニル、3−ペンテニルなどが挙げられる。)、アルキニル基(好ましくは炭素数2〜30、より好ましくは炭素数2〜20、特に好ましくは炭素数2〜10であり、例えばプロパルギル、3−ペンチニルなどが挙げられる。)、アリール基(好ましくは炭素数6〜30、より好ましくは炭素数6〜20、特に好ましくは炭素数6〜12であり、例えばフェニル、p−メチルフェニル、ナフチル、アントラニルなどが挙げられる。)、アミノ基(好ましくは炭素数0〜30、より好ましくは炭素数0〜20、特に好ましくは炭素数0〜10であり、例えばアミノ、メチルアミノ、ジメチルアミノ、ジエチルアミノ、ジベンジルアミノ、ジフェニルアミノ、ジトリルアミノなどが挙げられる。)、アルコキシ基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜10であり、例えばメトキシ、エトキシ、ブトキシ、2−エチルヘキシロキシなどが挙げられる。)、アリールオキシ基(好ましくは炭素数6〜30、より好ましくは炭素数6〜20、特に好ましくは炭素数6〜12であり、例えばフェニルオキシ、1−ナフチルオキシ、2−ナフチルオキシなどが挙げられる。)、ヘテロアリールオキシ基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばピリジルオキシ、ピラジルオキシ、ピリミジルオキシ、キノリルオキシなどが挙げられる。)、アシル基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばアセチル、ベンゾイル、ホルミル、ピバロイルなどが挙げられる。)、アルコキシカルボニル基(好ましくは炭素数2〜30、より好ましくは炭素数2〜20、特に好ましくは炭素数2〜12であり、例えばメトキシカルボニル、エトキシカルボニルなどが挙げられる。)、アリールオキシカルボニル基
(Substituent A)
An alkyl group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 10 carbon atoms, such as methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n- Decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), an alkenyl group (preferably having 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 10 carbon atoms, For example, vinyl, allyl, 2-butenyl, 3-pentenyl, etc.), alkynyl group (preferably having 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 10 carbon atoms, For example, propargyl, 3-pentynyl, etc.), aryl groups (preferably having 6 to 30 carbon atoms, more preferably A prime number of 6 to 20, particularly preferably a carbon number of 6 to 12, such as phenyl, p-methylphenyl, naphthyl, anthranyl, etc., an amino group (preferably a carbon number of 0 to 30, more preferably a carbon number). 0 to 20, particularly preferably 0 to 10 carbon atoms, such as amino, methylamino, dimethylamino, diethylamino, dibenzylamino, diphenylamino, ditolylamino, etc.), an alkoxy group (preferably 1 to 1 carbon atoms). 30, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 10 carbon atoms, and examples thereof include methoxy, ethoxy, butoxy, 2-ethylhexyloxy and the like, and aryloxy groups (preferably 6 carbon atoms). -30, more preferably 6-20 carbons, particularly preferably 6-12 carbons, Phenyloxy, 1-naphthyloxy, 2-naphthyloxy, etc.), heteroaryloxy group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, and particularly preferably 1 to 12 carbon atoms). For example, pyridyloxy, pyrazyloxy, pyrimidyloxy, quinolyloxy, etc.), acyl group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, Acetyl, benzoyl, formyl, pivaloyl, etc.), an alkoxycarbonyl group (preferably having 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as methoxycarbonyl, Ethoxycarbonyl, etc.), aryloxycarbonyl group
(好ましくは炭素数7〜30、より好ましくは炭素数7〜20、特に好ましくは炭素数7〜12であり、例えばフェニルオキシカルボニルなどが挙げられる。)、アシルオキシ基(好ましくは炭素数2〜30、より好ましくは炭素数2〜20、特に好ましくは炭素数2〜10であり、例えばアセトキシ、ベンゾイルオキシなどが挙げられる。)、アシルアミノ基(好ましくは炭素数2〜30、より好ましくは炭素数2〜20、特に好ましくは炭素数2〜10であり、例えばアセチルアミノ、ベンゾイルアミノなどが挙げられる。)、アルコキシカルボニルアミノ基(好ましくは炭素数2〜30、より好ましくは炭素数2〜20、特に好ましくは炭素数2〜12であり、例えばメトキシカルボニルアミノなどが挙げられる。)、アリールオキシカルボニルアミノ基(好ましくは炭素数7〜30、より好ましくは炭素数7〜20、特に好ましくは炭素数7〜12であり、例えばフェニルオキシカルボニルアミノなどが挙げられる。)、スルホニルアミノ基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばメタンスルホニルアミノ、ベンゼンスルホニルアミノなどが挙げられる。)、スルファモイル基(好ましくは炭素数0〜30、より好ましくは炭素数0〜20、特に好ましくは炭素数〜12であり、例えばスルファモイル、メチルスルファモイル、ジメチルスルファモイル、フェニルスルファモイルなどが挙げられる。)、カルバモイル基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばカルバモイル、メチルカルバモイル、ジエチルカルバモイル、フェニルカルバモイルなどが挙げられる。)、アルキルチオ基(好ましくは炭素数1〜30、より好ましくは炭素数
1〜20、特に好ましくは炭素数1〜12であり、例えばメチルチオ、エチルチオなどが挙げられる。)、アリールチオ基(好ましくは炭素数6〜30、より好ましくは炭素数6〜20、特に好ましくは炭素数6〜12であり、例えばフェニルチオなどが挙げられる。)、ヘテロアリールチオ基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばピリジルチオ、2−ベンズイミゾリルチオ、2−ベンズオキサゾリルチオ、2−ベンズチアゾリルチオなどが挙げられる。)、スルホニル基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばメシル、トシルなどが挙げられる。)、スルフィニル基
(Preferably 7 to 30 carbon atoms, more preferably 7 to 20 carbon atoms, particularly preferably 7 to 12 carbon atoms, such as phenyloxycarbonyl), acyloxy group (preferably 2 to 30 carbon atoms). More preferably 2 to 20 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as acetoxy and benzoyloxy), acylamino group (preferably 2 to 30 carbon atoms, more preferably 2 carbon atoms). To 20, particularly preferably 2 to 10 carbon atoms, such as acetylamino, benzoylamino, etc.), an alkoxycarbonylamino group (preferably 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms, especially Preferably, it has 2 to 12 carbon atoms, and examples thereof include methoxycarbonylamino and the like. Rubonylamino group (preferably having 7 to 30 carbon atoms, more preferably 7 to 20 carbon atoms, particularly preferably 7 to 12 carbon atoms, such as phenyloxycarbonylamino), sulfonylamino group (preferably C1-C30, More preferably, it is C1-C20, Most preferably, it is C1-C12, for example, methanesulfonylamino, benzenesulfonylamino, etc. are mentioned), sulfamoyl groups (preferably C0-C0). 30, more preferably 0 to 20 carbon atoms, particularly preferably 12 to 12 carbon atoms, such as sulfamoyl, methylsulfamoyl, dimethylsulfamoyl, phenylsulfamoyl, etc.), carbamoyl group (preferably 1-30 carbon atoms, more preferably 1-20 carbon atoms, particularly preferably charcoal 1 to 12, for example, carbamoyl, methylcarbamoyl, diethylcarbamoyl, phenylcarbamoyl, etc.), alkylthio group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably carbon number). 1 to 12, for example, methylthio, ethylthio, etc.), arylthio groups (preferably having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenylthio A heteroarylthio group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, and particularly preferably 1 to 12 carbon atoms such as pyridylthio, 2-benzimidazolylthio, 2-benzoxazolylthio, 2-benzthiazolylthio and the like. A phonyl group (preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, and particularly preferably 1 to 12 carbon atoms, and examples thereof include mesyl and tosyl. ), Sulfinyl group
(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばメタンスルフィニル、ベンゼンスルフィニルなどが挙げられる。)、ウレイド基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばウレイド、メチルウレイド、フェニルウレイドなどが挙げられる。)、リン酸アミド基(好ましくは炭素数1〜30、より好ましくは炭素数1〜20、特に好ましくは炭素数1〜12であり、例えばジエチルリン酸アミド、フェニルリン酸アミドなどが挙げられる。)、ヒドロキシ基、メルカプト基、ハロゲン原子(例えばフッ素原子、塩素原子、臭素原子、ヨウ素原子)、シアノ基、スルホ基、カルボキシル基、ニトロ基、ヒドロキサム酸基、スルフィノ基、ヒドラジノ基、イミノ基、ヘテロ環基(好ましくは炭素数1〜30、より好ましくは炭素数1〜12であり、ヘテロ原子としては、例えば窒素原子、酸素原子、硫黄原子、具体的には例えばイミダゾリル、ピリジル、キノリル、フリル、チエニル、ピペリジル、モルホリノ、ベンズオキサゾリル、ベンズイミダゾリル、ベンズチアゾリル、カルバゾリル基、アゼピニル基などが挙げられる。)、シリル基(好ましくは炭素数3〜40、より好ましくは炭素数3〜30、特に好ましくは炭素数3〜24であり、例えばトリメチルシリル、トリフェニルシリルなどが挙げられる。)などが挙げられる。 (Preferably 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methanesulfinyl, benzenesulfinyl, etc.), ureido group (preferably 1 carbon atom) To 30, more preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as ureido, methylureido, phenylureido, etc.), phosphoric acid amide groups (preferably 1 to 30 carbon atoms). , More preferably 1 to 20 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as diethyl phosphoric acid amide and phenyl phosphoric acid amide), hydroxy group, mercapto group, halogen atom (for example, fluorine atom) , Chlorine atom, bromine atom, iodine atom), cyano group, sulfo group, carboxyl group, nitro group, hydroxam Group, sulfino group, hydrazino group, imino group, heterocyclic group (preferably having 1 to 30 carbon atoms, more preferably 1 to 12 carbon atoms, and examples of the hetero atom include nitrogen atom, oxygen atom, sulfur atom, Specifically, examples include imidazolyl, pyridyl, quinolyl, furyl, thienyl, piperidyl, morpholino, benzoxazolyl, benzimidazolyl, benzthiazolyl, carbazolyl group, azepinyl group, etc., silyl group (preferably having 3 to 40 carbon atoms). More preferably, it has 3 to 30 carbon atoms, particularly preferably 3 to 24 carbon atoms, and examples thereof include trimethylsilyl, triphenylsilyl and the like.
R11、R12が有する置換基としてはアルキル基、アリール基が好ましく、アリール基がより好ましく、フェニル基がさらに好ましいが、R11、R12は置換基を有さないことが最も好ましい。 As the substituent that R 11 and R 12 have, an alkyl group and an aryl group are preferable, an aryl group is more preferable, and a phenyl group is more preferable, but R 11 and R 12 most preferably have no substituent.
Ar11、Ar12は一般式(2)で表される基を表し、互いに同じでも異なっていてもよい。 Ar 11 and Ar 12 represent a group represented by the general formula (2), and may be the same as or different from each other.
次に一般式(2)で表される基について説明する。
Ar21はアリーレン基、またはヘテロアリーレン基を表す。Ar21として好ましくはフェニレン基、ビフェニレン基、ナフチレン基、アントラニレン基、ピリジレン基であり、より好ましくはフェニレン基、ビフェニレン基であり、さらに好ましくはp‐フェニレン基である。
Next, the group represented by the general formula (2) will be described.
Ar 21 represents an arylene group or a heteroarylene group. Ar 21 is preferably a phenylene group, a biphenylene group, a naphthylene group, an anthranylene group, or a pyridylene group, more preferably a phenylene group or a biphenylene group, and still more preferably a p-phenylene group.
Ar21はさらに置換基を有しても良く、置換基の例としては前記R11、R12における置換基Aと同じであり、好ましい例も同じであるが、Ar21は置換基を有さないことが最も好ましい。 Ar 21 may further have a substituent, and examples of the substituent are the same as the substituent A in R 11 and R 12 described above, and preferred examples are also the same, but Ar 21 has a substituent. Most preferably not.
R21、R22、R23、R24は置換基または水素原子を表す。置換基の例は前記R11、R12における置換基Aと同じであり、それぞれアルキル基、アリール基、ヘテロアリール基、結合して芳香環を形成する基が好ましく、アリール基、結合して芳香環を形成する基がより好ましく、結合して芳香環を形成する基がさらに好ましい。 R 21 , R 22 , R 23 and R 24 represent a substituent or a hydrogen atom. Examples of the substituent are the same as the substituent A in R 11 and R 12 , and are preferably an alkyl group, an aryl group, a heteroaryl group, and a group that is bonded to form an aromatic ring. A group that forms a ring is more preferable, and a group that combines to form an aromatic ring is more preferable.
L2は置換もしくは無置換のo−アリーレン、ビニレン、−NR−、−O−、または、−S−を表す。−NR−におけるRは置換基を表し、前記置換基Aの例と同じである。 L 2 represents substituted or unsubstituted o-arylene, vinylene, —NR—, —O—, or —S—. R in —NR— represents a substituent, which is the same as the example of the substituent A.
L2として好ましくは置換もしくは無置換のo−アリーレン、ビニレン、−NR−であり、より好ましくは無置換のo−アリーレン、ビニレンであり、さらに好ましくは無置換のo−フェニレンである。 L 2 is preferably substituted or unsubstituted o-arylene, vinylene, and —NR—, more preferably unsubstituted o-arylene and vinylene, and further preferably unsubstituted o-phenylene.
mは0または1を表し、好ましくは0である。ただし、Ar 21 がフェニレン基である場合、mは1である。m=0の場合、R22及びR23が結合している炭素原子同士が連結することを意味する。
m represents 0 or 1, and is preferably 0. However, m is 1 when Ar 21 is a phenylene group. When m = 0, it means that the carbon atoms to which R 22 and R 23 are bonded are connected to each other.
以下に本発明の化合物の具体的化合物例を示すが、本発明はこれらに限定されない。 Specific examples of the compound of the present invention are shown below, but the present invention is not limited thereto.
本発明の別の好ましい実施態様は、一般式(3)または一般式(4)で表される化合物である。 Another preferred embodiment of the present invention is a compound represented by formula (3) or formula (4).
(式中、R31、R32 はそれぞれ独立に互いに結合して芳香環を形成する基を表す。R33、R34、R35、R36、R41、R42、R43、R44、R45、R46はそれぞれ独立にアルキル基、アリール基、互いに結合して芳香環を形成する基を表す。a、bはそれぞれ独立に2から4の整数を表す。g、hはそれぞれ独立に0から4の整数を表す。c、dはそれぞれ独立に0から8の整数を表す。i、jはそれぞれ独立に0から2の整数を表す。e、f、k、lはそれぞれ独立に0〜5の整数を表す。)
(In the formula, R 31 and R 32 each independently represent a group forming an aromatic ring by bonding to each other. R 33 , R 34 , R 35 , R 36 , R 41 , R 42 , R 43 , R 44 , R 45 and R 46 each independently represents an alkyl group, an aryl group, or a group that is bonded to each other to form an aromatic ring, a and b each independently represents an integer of 2 to 4. g and h are each independently Represents an integer of 0 to 4. c and d each independently represents an integer of 0 to 8. i and j each independently represents an integer of 0 to 2. e, f, k, and l each independently represents 0. Represents an integer of ~ 5.)
一般式(3)について説明する。一般式(3)中、R31、R32 はそれぞれ独立に互いに結合して芳香環を形成する基を表し、R33、R34、R35、R36はそれぞれ独立にアルキル基、アリール基、互いに結合して芳香環を形成する基を表す。R31、R32、R33、R34、R35としてはアリール基が好ましく、フェニル基、ナフチル基、ビフェニル基がより好ましく、フェニル基がさらに好ましい。
The general formula (3) will be described. In general formula (3), R 31 and R 32 each independently represent a group that forms an aromatic ring by bonding to each other , and R 33 , R 34 , R 35 , and R 36 each independently represent an alkyl group, an aryl group, A group that forms an aromatic ring by bonding to each other. R 31 , R 32 , R 33 , R 34 , and R 35 are preferably aryl groups, more preferably phenyl groups, naphthyl groups, and biphenyl groups, and even more preferably phenyl groups.
a、bはそれぞれ独立に2から4までの整数を表す。
a, b are to table an integer from 2 to 4 independently.
c、dはそれぞれ独立に0から8までの整数を表し、0から6が好ましく、0から4がさらに好ましく、0が最も好ましい。e、fは0〜5の整数を表し、0〜3が好ましく、0もしくは1がさらに好ましく、0が最も好ましい。 c and d each independently represents an integer of 0 to 8, preferably 0 to 6, more preferably 0 to 4, and most preferably 0. e and f represent an integer of 0 to 5, preferably 0 to 3, more preferably 0 or 1, and most preferably 0.
次に一般式(4)について説明する。一般式(4)中、R41、R42、R45、R46はそれぞれ独立にアルキル基、アリール基、互いに結合して芳香基を形成する基を表し、好ましい例は前記R31、R32、R33、R34、R35、R36と同じである。 Next, general formula (4) will be described. In the general formula (4), R 41 , R 42 , R 45 , and R 46 each independently represent an alkyl group, an aryl group, or a group that combines with each other to form an aromatic group, and preferred examples include the R 31 , R 32. , R 33 , R 34 , R 35 , R 36 are the same.
R43、R44はそれぞれ独立にアルキル基、アリール基、互いに結合して芳香環を形成する基を表す。置換基の例としては前記R31、R32、R33、R34、R35、R36と同じであり、アリール基、互いに結合して芳香環あるいはヘテロ芳香環を形成する基が好ましく、アリール基、互いに結合して芳香環を形成することがさらに好ましく、互いに結合してベンゼン環を形成することが最も好ましい。 R 43 and R 44 each independently represents an alkyl group, an aryl group, or a group that is bonded to each other to form an aromatic ring. Examples of the substituent are the same as R 31 , R 32 , R 33 , R 34 , R 35 , and R 36, and are preferably an aryl group or a group that is bonded to each other to form an aromatic ring or a heteroaromatic ring. More preferably, they are bonded to each other to form an aromatic ring, and most preferably bonded to each other to form a benzene ring.
g、hはそれぞれ独立に0から4までの整数を表し、0から2が好ましく、0もしくは1がさらに好ましく、0が最も好ましい。i、jはそれぞれ独立に0から2の整数を表し、1もしくは2が好ましく、2が最も好ましい。k、lは、0〜5の整数を表し、0〜3が好ましく、0もしくは1がさらに好ましく、0が最も好ましい。 g and h each independently represent an integer of 0 to 4, preferably 0 to 2, more preferably 0 or 1, and most preferably 0. i and j each independently represents an integer of 0 to 2, preferably 1 or 2, and most preferably 2. k and l represent an integer of 0 to 5, preferably 0 to 3, more preferably 0 or 1, and most preferably 0.
一般式(3)で表される化合物の具体的化合物例は、上記具体的化合物例のうち、(1−2)などが挙げられ、一般式(4)で表される化合物の具体的化合物例は、(2−1)、(2−3)、(2−5)、(2−6)、(2−7)、(2−9)、(2−10)などが挙げられるが本発明はこれらに限定されない。
Specific compound examples of the compound represented by the general formula (3) include ( 1-2) among the above specific compound examples, and specific compound examples of the compound represented by the general formula (4) (2-1), (2-3), (2-5), (2-6), (2-7), (2-9), (2-10) and the like can be mentioned. Is not limited to these.
本発明の化合物の製造方法について述べる。一般式(3)あるいは一般式(4)で表される化合物は例えば下記のスキームに従って合成できる。 A method for producing the compound of the present invention will be described. The compound represented by the general formula (3) or the general formula (4) can be synthesized, for example, according to the following scheme.
(式中、X、Yはハロゲン原子を表し、R1、R2、R3、R4はそれぞれ独立にアルキル基、アリール基、互いに結合して芳香環を形成する基を表す。a、bは0から4の整数を表し、c、dは、0〜5の整数を表す。) (In the formula, X and Y represent a halogen atom, and R 1 , R 2 , R 3 , and R 4 each independently represent an alkyl group, an aryl group, or a group that combines with each other to form an aromatic ring. A, b Represents an integer of 0 to 4, and c and d represent an integer of 0 to 5.)
前記スキームの中間体Aは種々の公知の炭素−ケイ素結合形成反応を利用して合成可能であり、その方法は特に限定しないが、例えば、ザ・ケミストリー・オブ・オルガニック・シリコン・コンパウンド、パート1(The Chemistry of Organic Silicon compounds, part1) (John Wiley & Sons) P.655〜761などに記載されている手法を利用して合成することができる。 The intermediate A in the scheme can be synthesized by utilizing various known carbon-silicon bond forming reactions, and the method is not particularly limited. For example, The Chemistry of Organic Silicon Compound, Part 1 (The Chemistry of Organic Silicon compounds, part 1) (John Wiley & Sons) It can synthesize | combine using the method described in P.655-761.
一般式(3)あるいは一般式(4)で表される化合物は中間体Aから種々の公知の炭素−窒素結合形成反応を利用して合成可能であり、その方法は特に限定しないが、例えばジャーナル・オブ・アメリカン・ケミカル・ソシエティ(Journal of American Chemical Society), 118, 7215 (1996)あるいはジャーナル・オブ・アメリカン・ケミカル・ソシエティ(Journal of American Chemical Society), 118, 7217 (1996)などに記載されているようなパラジウム触媒を用いた方法を利用して合成する手法が好ましい。 The compound represented by the general formula (3) or the general formula (4) can be synthesized from the intermediate A using various known carbon-nitrogen bond forming reactions, and the method is not particularly limited.・ Journal of American Chemical Society, 118, 7215 (1996) or Journal of American Chemical Society, 118, 7217 (1996) A method of synthesis using a method using a palladium catalyst is preferred.
パラジウム触媒としては、特に限定しないが、例えば、パラジウムテトラキストリフェニルホスフィン、パラジウムカーボン、酢酸パラジウム、パラジウムジクロライド(dppf)(dppf:1,1’−ビスジフェニルホスフィノフェロセン)などが挙げられる。トリフェニルホスフィン、P(t−Bu)3などの配位子を同時に添加しても良い。 The palladium catalyst is not particularly limited, and examples thereof include palladium tetrakistriphenylphosphine, palladium carbon, palladium acetate, palladium dichloride (dppf) (dppf: 1,1′-bisdiphenylphosphinoferrocene) and the like. A ligand such as triphenylphosphine or P (t-Bu) 3 may be added simultaneously.
本反応は、塩基を用いたほうが好ましい。用いる塩基の種類は特に限定しないが、例えば、炭酸ナトリウム、酢酸ナトリウム、炭酸カリウム、炭酸ルビジウム、トリエチルアミン、t−ブトキシナトリウム、t−ブトキシカリウムなどが挙げられる。用いる塩基の量は特に限定しないが、カルバゾールあるいはその誘導体、イミノスチルベンあるいはその誘導体に対して、好ましくは0.1〜20当量、特に好ましくは1〜10当量である。 In this reaction, it is preferable to use a base. Although the kind of base to be used is not particularly limited, examples thereof include sodium carbonate, sodium acetate, potassium carbonate, rubidium carbonate, triethylamine, sodium t-butoxy, potassium t-butoxy and the like. The amount of the base to be used is not particularly limited, but is preferably 0.1 to 20 equivalents, particularly preferably 1 to 10 equivalents with respect to carbazole or a derivative thereof, iminostilbene or a derivative thereof.
本反応は溶媒を用いた方が好ましい。用いる溶媒は特に限定しないが、例えば、エタノール、水、エチレングリコールジメチルエーテル、ジエチレングリコールジメチルエーテル、ジメチルホルムアミド、トルエン、テトラヒドロフラン、キシレン、メシチレンおよびそれらの混合溶媒を用いることができる。 In this reaction, it is preferable to use a solvent. Although the solvent to be used is not particularly limited, for example, ethanol, water, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, dimethylformamide, toluene, tetrahydrofuran, xylene, mesitylene, and a mixed solvent thereof can be used.
本発明の化合物を合成する際の反応温度は特に限定はないが、好ましくは20〜220℃、好ましくは20〜180℃、より好ましくは20〜160℃である。 Although the reaction temperature at the time of synthesize | combining the compound of this invention does not have limitation in particular, Preferably it is 20-220 degreeC, Preferably it is 20-180 degreeC, More preferably, it is 20-160 degreeC.
一般式(1)、一般式(3)、または一般式(4)で表される化合物(以下、本発明の化合物ともいう)は低分子化合物であっても良く、また、オリゴマー化合物、ポリマー化合物(重量平均分子量(ポリスチレン換算)は好ましくは1000〜5000000、より好ましくは2000〜1000000、さらに好ましくは3000〜100000である。)であっても良い。ポリマー化合物の場合、一般式(1)、一般式(2)、一般式(3)、または一般式(4)で表される構造がポリマー主鎖中に含まれても良く、また、ポリマー側鎖に含まれていても良い。また、ポリマー化合物の場合、ホモポリマー化合物であっても良く、共重合体であっても良い。本発明の化合物は低分子化合物が好ましい。 The compound represented by the general formula (1), the general formula (3), or the general formula (4) (hereinafter, also referred to as the compound of the present invention) may be a low molecular compound, or an oligomer compound or a polymer compound. (The weight average molecular weight (in terms of polystyrene) is preferably 1000 to 5000000, more preferably 2000 to 1000000, and still more preferably 3000 to 100,000). In the case of a polymer compound, a structure represented by the general formula (1), the general formula (2), the general formula (3), or the general formula (4) may be included in the polymer main chain. It may be included in the chain. In the case of a polymer compound, it may be a homopolymer compound or a copolymer. The compound of the present invention is preferably a low molecular compound.
本発明の発光素子に関して説明する。本発明の発光素子は、本発明の化合物を利用する素子であればシステム、駆動方法、利用形態など特に問わない。代表的な発光素子として有機EL(エレクトロルミネッセンス)素子を挙げることができる。 The light emitting device of the present invention will be described. The light emitting device of the present invention is not particularly limited as long as it is a device using the compound of the present invention, such as a system, a driving method, and a usage form. An organic EL (electroluminescence) element can be mentioned as a typical light emitting element.
本発明の発光素子において、本発明の化合物の作用や含有する層は特に限定されないが、正孔輸送層または発光層中に含まれることが好ましく、発光層中に含まれることがより好ましく、発光層中にホスト材料として含まれることがさらに好ましい。 In the light emitting device of the present invention, the action of the compound of the present invention and the layer to be contained are not particularly limited, but are preferably contained in the hole transport layer or the light emitting layer, more preferably contained in the light emitting layer. More preferably, it is contained as a host material in the layer.
本発明の発光素子において、有機層中に本発明の化合物が主成分として含まれることが好ましい。本発明の化合物が正孔輸送層に含まれる場合、本発明の化合物を単独又は複数用いるのが好ましく、さらに本発明以外の他の化合物を混合してもよい。
一方、本発明の化合物が発光層中に含まれる場合、本発明の化合物と発光材料との比は層全質量に対して発光材料が0.01質量%以上20質量%以下であることが好ましく、0.1質量%以上15質量%以下であることがより好ましく、0.5質量%以上10質量%以下であることがさらに好ましい。
In the light-emitting device of the present invention, the organic layer preferably contains the compound of the present invention as a main component. When the compound of this invention is contained in a positive hole transport layer, it is preferable to use the compound of this invention individually or in multiple, Furthermore, you may mix other compounds other than this invention.
On the other hand, when the compound of the present invention is contained in the light emitting layer, the ratio of the compound of the present invention to the light emitting material is preferably 0.01% by mass or more and 20% by mass or less of the light emitting material with respect to the total mass of the layer. The content is more preferably 0.1% by mass or more and 15% by mass or less, and further preferably 0.5% by mass or more and 10% by mass or less.
本発明の発光素子中に含まれる発光材料は一重項励起子から発光する蛍光発光性化合物、または、三重項励起子から発光する燐光発光性化合物のいずれであっても良い。例えばベンゾオキサゾールおよびそれらの誘導体、ベンゾイミダゾールおよびそれらの誘導体、ベンゾチアゾールおよびそれらの誘導体、スチリルベンゼンおよびそれらの誘導体、ポリフェニルおよびそれらの誘導体、ジフェニルブタジエンおよびそれらの誘導体、テトラフェニルブタジエンおよびそれらの誘導体、ナフタルイミドおよびそれらの誘導体、クマリンおよびそれらの誘導体、縮合芳香族化合物、ペリノンおよびそれらの誘導体、オキサジアゾールおよびそれらの誘導体、オキサジンおよびそれらの誘導体、アルダジンおよびそれらの誘導体、ピラリジンおよびそれらの誘導体、シクロペンタジエンおよびそれらの誘導体、ビススチリルアントラセンおよびそれらの誘導体、キナクリドンおよびそれらの誘導体、ピロロピリジンおよびそれらの誘導体、チアジアゾロピリジンおよびそれらの誘導体、シクロペンタジエンおよびそれらの誘導体、スチリルアミンおよびそれらの誘導体、ジケトピロロピロールおよびそれらの誘導体、芳香族ジメチリディンおよびそれらの化合物、8−キノリノールおよびそれらの誘導体の金属錯体やピロメテンおよびそれらの誘導
体の金属錯体、希土類錯体、遷移金属錯体に代表される各種金属錯体等、ポリチオフェン、ポリフェニレン、ポリフェニレンビニレン等のポリマー化合物、有機シランおよびそれらの誘導体等が挙げられる。発光材料は好ましくは縮合芳香族化合物、キナクリドンおよびそれらの誘導体、ジケトピロロピロールおよびそれらの誘導体、ピロメテンおよびそれらの誘導体の金属錯体、希土類錯体、遷移金属錯体であり、さらに好ましくは縮合芳香族化合物、遷移金属錯体である。
The light-emitting material contained in the light-emitting element of the present invention may be either a fluorescent compound that emits light from singlet excitons or a phosphorescent compound that emits light from triplet excitons. For example, benzoxazole and derivatives thereof, benzimidazole and derivatives thereof, benzothiazole and derivatives thereof, styrylbenzene and derivatives thereof, polyphenyl and derivatives thereof, diphenylbutadiene and derivatives thereof, tetraphenylbutadiene and derivatives thereof , Naphthalimide and their derivatives, coumarin and their derivatives, condensed aromatic compounds, perinones and their derivatives, oxadiazole and their derivatives, oxazine and their derivatives, aldazine and their derivatives, pyralidine and their derivatives , Cyclopentadiene and their derivatives, bisstyrylanthracene and their derivatives, quinacridone and their derivatives, pyrrolopyridine And their derivatives, thiadiazolopyridine and their derivatives, cyclopentadiene and their derivatives, styrylamine and their derivatives, diketopyrrolopyrrole and their derivatives, aromatic dimethylidin and their compounds, 8-quinolinol and their Metal complexes of pyroxene derivatives, metal complexes of pyromethene and their derivatives, various metal complexes represented by rare earth complexes, transition metal complexes, polymer compounds such as polythiophene, polyphenylene, polyphenylene vinylene, organic silanes and their derivatives, etc. It is done. The light-emitting material is preferably a condensed aromatic compound, quinacridone and derivatives thereof, diketopyrrolopyrrole and derivatives thereof, metal complexes of pyromethene and derivatives thereof, rare earth complexes, transition metal complexes, more preferably condensed aromatic compounds , A transition metal complex.
3重項励起子から発光する燐光発光性化合物の場合は特に遷移金属錯体が好ましい。遷移金属錯体の中心金属は特に限定されないが、好ましくはイリジウム、白金、レニウム、またはルテニウムであり、より好ましくはイリジウムまたは白金であり、特に好ましくはイリジウムである。遷移金属錯体の中でも、オルトメタル化錯体が非常に好ましい。オルトメタル化錯体(Orthometalated Complex)とは、山本明夫著「有機金属 基礎と応用」、150頁および232頁、裳華房社(1982年)やH.Yersin著「フォトケミストリー・アンド・フォトフィジックス・オブ・コーディナーション・コンパウンド(Photochemistry and Photophysics of Coordination Compound)」、71〜77頁および135〜146頁、Springer−Verlag社(1987年)等に記載されている化合物群の総称である。 In the case of a phosphorescent compound that emits light from triplet excitons, a transition metal complex is particularly preferable. The central metal of the transition metal complex is not particularly limited, but is preferably iridium, platinum, rhenium, or ruthenium, more preferably iridium or platinum, and particularly preferably iridium. Of the transition metal complexes, orthometalated complexes are very preferred. The orthometalated complex is “A basic and application of organometallics” written by Akio Yamamoto, pages 150 and 232, Hankabo (1982), H. Yersin, “Photochemistry and Photophysics and Photophysics of Coordination Compound”, 71-77 and 135-146, published by Springer-Verlag, Inc. (1987) It is a general term for a group of compounds.
上記燐光材料は、20℃以上における燐光量子収率が70%以上であるのが好ましく、より好ましくは80%以上であり、さらに好ましくは85%以上である。 The phosphorescent material preferably has a phosphorescent quantum yield of 70% or higher at 20 ° C. or higher, more preferably 80% or higher, and still more preferably 85% or higher.
上記燐光発光材料としては、例えばUS 6303231 B1、US6097147、WO 00/57676、WO 00/70655、WO 01/08230、WO 01/39234 A2、WO 01/41512 A1、WO 02/02714 A2、WO 02/15645 A1、特開2001−247859、特願2000−33561、特願2001−189539、特願2001−248165、特願2001−33684、特願2001−239281、特願2001−219909、EP 1211257、特開2002−226495、特開2002−234894、特開2001−247859、特開2001−298470、特開2002−173674、特開2002−203678、特開2002−203679等の各号の公報および明細書や、ネイチャー(Nature)、395巻、151頁(1998年)、アプライド・フィジックス・レターズ(Applied Physics Letters)、75巻、4頁(1999年)、ポリマー・プレプリンツ(Polymer Preprints)、41巻、770頁(2000年)、ジャーナル・オブ・アメリカン・ケミカル・ソシエティ(Jounal of American Chemical Society)、123巻、4304頁(2001年)、アプライド・フィジックス・レターズ(Applied Physics Letters)、79巻、2082頁(1999年)等の文献に記載されているものが好適に利用できる。 Examples of the phosphorescent material include US 6303231 B1, US 6097147, WO 00/57676, WO 00/70655, WO 01/08230, WO 01/39234 A2, WO 01/41512 A1, WO 02/02714 A2, and WO 02 /. Japanese Patent Application No. 15645 A1, Japanese Patent Application No. 2001-247859, Japanese Patent Application No. 2000-33561, Japanese Patent Application No. 2001-189539, Japanese Patent Application No. 2001-248165, Japanese Patent Application No. 2001-339684, Japanese Patent Application No. 2001-239281, Japanese Patent Application No. 2001-219909, and EP 12111257. 2002-226495, JP 2002-234894, JP 2001-247659, JP 2001-298470, JP 2002-173675, JP 2002-203678, JP 2002-2036 79 and other publications and specifications, Nature, 395, 151 (1998), Applied Physics Letters, 75, 4 (1999), Polymer Preprints (Polymer Preprints), 41, 770 (2000), Journal of American Chemical Society, 123, 4304 (2001), Applied Physics Letters (Appli) Physics Letters), 79, 2082 (1999) and the like can be suitably used.
本発明の化合物を含有する発光素子の有機層の形成方法は、特に限定されるものではないが、抵抗加熱蒸着、電子ビーム、スパッタリング、分子積層法、コーティング法、インクジェット法、印刷法などの方法が用いられ、特性面、製造面で抵抗加熱蒸着、コーティング法、転写法が好ましい。 The method for forming the organic layer of the light-emitting device containing the compound of the present invention is not particularly limited, but methods such as resistance heating vapor deposition, electron beam, sputtering, molecular lamination method, coating method, inkjet method, printing method, etc. In view of characteristics and production, resistance heating vapor deposition, coating method, and transfer method are preferable.
本発明の発光素子は陽極、陰極の一対の電極間に発光層を含む少なくとも一層の有機化合物膜を形成した素子であり、発光層のほか正孔注入層、正孔輸送層、電子注入層、電子輸送層、保護層などを有してもよく、またこれらの各層はそれぞれ他の機能を備えたものであってもよい。各層の形成にはそれぞれ種々の材料を用いることができる。 The light-emitting element of the present invention is an element in which at least one organic compound film including a light-emitting layer is formed between a pair of electrodes of an anode and a cathode. In addition to the light-emitting layer, a hole injection layer, a hole transport layer, an electron injection layer, An electron transport layer, a protective layer, and the like may be included, and each of these layers may have other functions. Various materials can be used for forming each layer.
本発明の発光素子で用いられる基材は、特に限定されないが、ジルコニア安定化イットリウム、ガラス等の無機材料、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート等のポリエステルや、ポリエチレン、ポリカーボネート、ポリエーテルスルホン、ポリアリレート、アリルジグリコールカーボネート、ポリイミド、ポリシクロオレフィン、ノルボルネン樹脂、ポリ(クロロトリフルオロエチレン)、テフロン(登録商標)、ポリテトラフルオロエチレン−ポリエチレン共重合体等の高分子量材料であっても良い。 The substrate used in the light-emitting device of the present invention is not particularly limited, but inorganic materials such as zirconia-stabilized yttrium and glass, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyethylene, polycarbonate, and polyethersulfone. High molecular weight materials such as polyarylate, allyl diglycol carbonate, polyimide, polycycloolefin, norbornene resin, poly (chlorotrifluoroethylene), Teflon (registered trademark), polytetrafluoroethylene-polyethylene copolymer good.
陽極は正孔注入層、正孔輸送層、発光層などに正孔を供給するものであり、金属、合金、金属酸化物、電気伝導性化合物、またはこれらの混合物などを用いることができ、好ましくは仕事関数が4eV以上の材料である。具体例としては酸化スズ、酸化亜鉛、酸化インジウム、酸化インジウムスズ(ITO)等の導電性金属酸化物、あるいは金、銀、クロム、ニッケル等の金属、さらにこれらの金属と導電性金属酸化物との混合物または積層物、ヨウ化銅、硫化銅などの無機導電性物質、ポリアニリン、ポリチオフェン、ポリピロールなどの有機導電性材料、およびこれらとITOとの積層物などが挙げられ、好ましくは、導電性金属酸化物であり、特に、生産性、高導電性、透明性等の点からITOが好ましい。陽極の膜厚は材料により適宜選択可能であるが、通常10nm〜5μmの範囲のものが好ましく、より好ましくは50nm〜1μmであり、更に好ましくは100nm〜500nmである。 The anode supplies holes to a hole injection layer, a hole transport layer, a light emitting layer, and the like, and a metal, an alloy, a metal oxide, an electrically conductive compound, or a mixture thereof can be used. Is a material having a work function of 4 eV or more. Specific examples include conductive metal oxides such as tin oxide, zinc oxide, indium oxide and indium tin oxide (ITO), metals such as gold, silver, chromium and nickel, and these metals and conductive metal oxides. Inorganic conductive materials such as copper iodide and copper sulfide, organic conductive materials such as polyaniline, polythiophene, and polypyrrole, and laminates of these with ITO, preferably conductive metals It is an oxide, and ITO is particularly preferable from the viewpoint of productivity, high conductivity, transparency, and the like. Although the film thickness of the anode can be appropriately selected depending on the material, it is usually preferably in the range of 10 nm to 5 μm, more preferably 50 nm to 1 μm, still more preferably 100 nm to 500 nm.
陽極は通常、ソーダライムガラス、無アルカリガラス、透明樹脂基板などの上に層形成したものが用いられる。ガラスを用いる場合、その材質については、ガラスからの溶出イオンを少なくするため、無アルカリガラスを用いることが好ましい。また、ソーダライムガラスを用いる場合、シリカなどのバリアコートを施したものを使用することが好ましい。基板の厚みは、機械的強度を保つのに十分であれば特に制限はないが、ガラスを用いる場合には、通常0.2mm以上、好ましくは0.7mm以上のものを用いる。 As the anode, a layer formed on a soda-lime glass, non-alkali glass, a transparent resin substrate or the like is usually used. When glass is used, it is preferable to use non-alkali glass as the material in order to reduce ions eluted from the glass. Moreover, when using soda-lime glass, it is preferable to use what gave barrier coatings, such as a silica. The thickness of the substrate is not particularly limited as long as it is sufficient to maintain the mechanical strength, but when glass is used, a thickness of 0.2 mm or more, preferably 0.7 mm or more is usually used.
陽極の作製には材料によって種々の方法が用いられるが、例えばITOの場合、電子ビーム法、スパッタリング法、抵抗加熱蒸着法、化学反応法(ゾルーゲル法など)、酸化インジウムスズの分散物の塗布などの方法で膜形成される。
陽極は洗浄その他の処理により、素子の駆動電圧を下げたり、発光効率を高めることも可能である。例えばITOの場合、UV−オゾン処理、プラズマ処理などが効果的である。
Various methods are used for producing the anode depending on the material. For example, in the case of ITO, an electron beam method, a sputtering method, a resistance heating vapor deposition method, a chemical reaction method (sol-gel method, etc.), a coating of a dispersion of indium tin oxide, etc. A film is formed by this method.
The anode can be subjected to cleaning or other treatments to lower the drive voltage of the element or increase the light emission efficiency. For example, in the case of ITO, UV-ozone treatment, plasma treatment, etc. are effective.
陰極は電子注入層、電子輸送層、発光層などに電子を供給するものであり、電子注入層、電子輸送層、発光層などの負極と隣接する層との密着性やイオン化ポテンシャル、安定性等を考慮して選ばれる。陰極の材料としては金属、合金、金属ハロゲン化物、金属酸化物、電気伝導性化合物、またはこれらの混合物を用いることができ、具体例としてはアルカリ金属(例えばLi、Na、K等)およびそのフッ化物または酸化物、アルカリ土類金属(例えばMg、Ca等)およびそのフッ化物または酸化物、金、銀、鉛、アルミニウム、ナトリウム−カリウム合金またはそれらの混合金属、リチウム−アルミニウム合金またはそれらの混合金属、マグネシウム−銀合金またはそれらの混合金属、インジウム、イッテリビウム等の希土類金属等が挙げられ、好ましくは仕事関数が4eV以下の材料であり、より好ましくはアルミニウム、リチウム−アルミニウム合金またはそれらの混合金属、マグネシウム−銀合金またはそれらの混合金属等である。陰極は、上記化合物および混合物の単層構造だけでなく、上記化合物および混合物を含む積層構造を取ることもできる。例えば、アルミニウム/フッ化リチウム、アルミニウム/酸化リチウム の積層構造が好ましい。陰極の膜厚は材料により適宜選択可能であるが、通常10nm〜5μmの範囲のものが好ましく、より好ましくは50nm〜1μmであり、更に好ましくは100nm〜1μmである。 The cathode supplies electrons to the electron injection layer, the electron transport layer, the light emitting layer, etc., and the adhesion, ionization potential, stability, etc., between the negative electrode and the adjacent layer such as the electron injection layer, electron transport layer, light emitting layer, etc. Selected in consideration of As a material for the cathode, a metal, an alloy, a metal halide, a metal oxide, an electrically conductive compound, or a mixture thereof can be used. Specific examples include an alkali metal (for example, Li, Na, K, etc.) and its fluoride. Or oxides, alkaline earth metals (eg Mg, Ca, etc.) and their fluorides or oxides, gold, silver, lead, aluminum, sodium-potassium alloys or their mixed metals, lithium-aluminum alloys or their mixtures Examples thereof include metals, magnesium-silver alloys or mixed metals thereof, rare earth metals such as indium and ytterbium, preferably materials having a work function of 4 eV or less, more preferably aluminum, lithium-aluminum alloys or mixed metals thereof. , Magnesium-silver alloys or mixed metals thereofThe cathode can take not only a single layer structure of the compound and the mixture but also a laminated structure containing the compound and the mixture. For example, a laminated structure of aluminum / lithium fluoride and aluminum / lithium oxide is preferable. The film thickness of the cathode can be appropriately selected depending on the material, but is usually preferably in the range of 10 nm to 5 μm, more preferably 50 nm to 1 μm, still more preferably 100 nm to 1 μm.
陰極の作製には電子ビーム法、スパッタリング法、抵抗加熱蒸着法、コーティング法などの方法が用いられ、金属を単体で蒸着することも、二成分以上を同時に蒸着することもできる。さらに、複数の金属を同時に蒸着して合金電極を形成することも可能であり、またあらかじめ調整した合金を蒸着させてもよい。
陽極および陰極のシート抵抗は低い方が好ましく、数百Ω/□以下が好ましい。
For production of the cathode, methods such as an electron beam method, a sputtering method, a resistance heating vapor deposition method, and a coating method are used, and a metal can be vapor-deposited alone or two or more components can be vapor-deposited simultaneously. Furthermore, a plurality of metals can be vapor-deposited simultaneously to form an alloy electrode, or a previously prepared alloy may be vapor-deposited.
The sheet resistance of the anode and cathode is preferably low, and is preferably several hundred Ω / □ or less.
発光層の材料は、電界印加時に陽極または正孔注入層、正孔輸送層から正孔を注入することができると共に陰極または電子注入層、電子輸送層から電子を注入することができる機能や、注入された電荷を移動させる機能、正孔と電子の再結合の場を提供して発光させる機能を有する層を形成することができるものであれば何でもよく、例えばベンゾオキサゾール、ベンゾイミダゾール、ベンゾチアゾール、スチリルベンゼン、ポリフェニル、ジフェニルブタジエン、テトラフェニルブタジエン、ナフタルイミド、クマリン、ペリレン、ペリノン、オキサジアゾール、アルダジン、ピラリジン、シクロペンタジエン、ビススチリルアントラセン、キナクリドン、ピロロピリジン、チアジアゾロピリジン、シクロペンタジエン、スチリルアミン、芳香族ジメチリディン化合物、8−キノリノールの金属錯体や希土類錯体に代表される各種金属錯体、ポリチオフェン、ポリフェニレン、ポリフェニレンビニレン等のポリマー化合物、有機シラン、イリジウムトリスフェニルピリジン錯体、および、白金ポルフィリン錯体に代表される遷移金属錯体、および、それらの誘導体等が挙げられる。発光層の材料の少なくとも一つは、りん光材料である。発光層の膜厚は特に限定されるものではないが、通常1nm〜5μmの範囲のものが好ましく、より好ましくは5nm〜1μmであり、更に好ましくは10nm〜500nmである。
発光層の形成方法は、特に限定されるものではないが、抵抗加熱蒸着、電子ビーム、スパッタリング、分子積層法、コーティング法(スピンコート法、キャスト法、ディップコート法など)、インクジェット法、印刷法、LB法、転写法などの方法が用いられ、好ましくは抵抗加熱蒸着、コーティング法である。
The material of the light emitting layer is a function that can inject holes from the anode or hole injection layer, hole transport layer and cathode or electron injection layer, electron transport layer when an electric field is applied, Any material can be used as long as it can form a layer having a function of transferring injected charges and a function of emitting light by providing a recombination field of holes and electrons, such as benzoxazole, benzimidazole, and benzothiazole. , Styrylbenzene, polyphenyl, diphenylbutadiene, tetraphenylbutadiene, naphthalimide, coumarin, perylene, perinone, oxadiazole, aldazine, pyralidine, cyclopentadiene, bisstyrylanthracene, quinacridone, pyrrolopyridine, thiadiazolopyridine, cyclopentadiene , Styrylamine, Represented by aromatic dimethylidin compounds, various metal complexes represented by 8-quinolinol metal complexes and rare earth complexes, polymer compounds such as polythiophene, polyphenylene, polyphenylene vinylene, organic silanes, iridium trisphenylpyridine complexes, and platinum porphyrin complexes. Transition metal complexes and derivatives thereof. At least one of the materials of the light emitting layer is a phosphorescent material. Although the film thickness of a light emitting layer is not specifically limited, Usually, the thing of the range of 1 nm-5 micrometers is preferable, More preferably, it is 5 nm-1 micrometer, More preferably, it is 10 nm-500 nm.
The method for forming the light emitting layer is not particularly limited, but resistance heating vapor deposition, electron beam, sputtering, molecular lamination method, coating method (spin coating method, casting method, dip coating method, etc.), inkjet method, printing method , LB method, transfer method and the like are used, preferably resistance heating vapor deposition and coating method.
発光層は単一化合物で形成されても良いし、複数の化合物で形成されても良い。また、発光層は一つであっても複数であっても良く、それぞれの層が異なる発光色で発光して、例えば、白色を発光しても良い。単一の発光層から白色を発光しても良い。発光層が複数の場合は、それぞれの発光層は単一材料で形成されていても良いし、複数の化合物で形成されていても良い。 The light emitting layer may be formed of a single compound or a plurality of compounds. Further, the light emitting layer may be one or plural, and each layer may emit light with different emission colors, for example, white light may be emitted. White light may be emitted from a single light emitting layer. When there are a plurality of light emitting layers, each light emitting layer may be formed of a single material or may be formed of a plurality of compounds.
本発明の有機電界発光素子の発光層は積層構造を少なくとも一つ有していても良い。積層数は2層以上50層以下が好ましく、4層以上30層以下がより好ましく、6層以上20層以下がさらに好ましい。 The light emitting layer of the organic electroluminescent element of the present invention may have at least one laminated structure. The number of stacked layers is preferably 2 or more and 50 or less, more preferably 4 or more and 30 or less, and still more preferably 6 or more and 20 or less.
積層を構成する各層の膜厚は特に限定されないが、0.2nm以上、20nm以下が好ましく、0.4nm以上、15nm以下がより好ましく、0.5nm以上10nm以下がさらに好ましく、1nm以上5nm以下が特に好ましい。 The thickness of each layer constituting the stack is not particularly limited, but is preferably 0.2 nm or more and 20 nm or less, more preferably 0.4 nm or more and 15 nm or less, further preferably 0.5 nm or more and 10 nm or less, and more preferably 1 nm or more and 5 nm or less. Particularly preferred.
本発明の有機電界発光素子の発光層は複数のドメイン構造を有していても良い。発光層中に他のドメイン構造を有していても良い。各ドメインの径は、0.2nm以上10nm以下が好ましく、0.3nm以上5nm以下がより好ましく、0.5nm以上3nm以下がさらに好ましく、0.7nm以上2nm以下が特に好ましい。 The light emitting layer of the organic electroluminescent element of the present invention may have a plurality of domain structures. The light emitting layer may have another domain structure. The diameter of each domain is preferably from 0.2 nm to 10 nm, more preferably from 0.3 nm to 5 nm, still more preferably from 0.5 nm to 3 nm, and particularly preferably from 0.7 nm to 2 nm.
正孔注入層、正孔輸送層の材料は、陽極から正孔を注入する機能、正孔を輸送する機能、陰極から注入された電子を障壁する機能のいずれか有しているものであればよい。その具体例としては、カルバゾール、トリアゾール、オキサゾール、オキサジアゾール、イミダゾール、ポリアリールアルカン、ピラゾリン、ピラゾロン、フェニレンジアミン、アリールアミン、アミノ置換カルコン、スチリルアントラセン、フルオレノン、ヒドラゾン、スチルベン、シラザン、芳香族第三級アミン化合物、スチリルアミン化合物、芳香族ジメチリディン系化合物、ポルフィリン系化合物、ポリシラン系化合物、ポリ(N−ビニルカルバゾール)、アニリン系共重合体、チオフェンオリゴマー、ポリチオフェン等の導電性高分子オリゴマー、有機シラン誘導体、カーボン膜、本発明の化合物、および、それらの誘導体等が挙げられる。正孔注入層、正孔輸送層の膜厚は特に限定されるものではないが、通常1nm〜5μmの範囲のものが好ましく、 The material of the hole injection layer and the hole transport layer may be any one having a function of injecting holes from the anode, a function of transporting holes, or a function of blocking electrons injected from the cathode. Good. Specific examples include carbazole, triazole, oxazole, oxadiazole, imidazole, polyarylalkane, pyrazoline, pyrazolone, phenylenediamine, arylamine, amino-substituted chalcone, styrylanthracene, fluorenone, hydrazone, stilbene, silazane, aromatic group Tertiary amine compounds, styrylamine compounds, aromatic dimethylidin compounds, porphyrin compounds, polysilane compounds, poly (N-vinylcarbazole), aniline copolymers, thiophene oligomers, conductive polymer oligomers such as polythiophene, organic Examples include silane derivatives, carbon films, compounds of the present invention, and derivatives thereof. The thicknesses of the hole injection layer and the hole transport layer are not particularly limited, but those in the range of usually 1 nm to 5 μm are preferable,
より好ましくは5nm〜1μmであり、更に好ましくは10nm〜500nmである。正孔注入層、正孔輸送層は上述した材料の1種または2種以上からなる単層構造であってもよいし、同一組成または異種組成の複数層からなる多層構造であってもよい。
正孔注入層、正孔輸送層の形成方法としては、真空蒸着法やLB法、前記正孔注入輸送材料を溶媒に溶解または分散させてコーティングする方法(スピンコート法、キャスト法、ディップコート法など)、インクジェット法、印刷法、転写法が用いられる。コーティング法の場合、樹脂成分と共に溶解または分散することができ、樹脂成分としては例えば、ポリ塩化ビニル、ポリカーボネート、ポリスチレン、ポリメチルメタクリレート、ポリブチルメタクリレート、ポリエステル、ポリスルホン、ポリフェニレンオキシド、ポリブタジエン、ポリ(N−ビニルカルバゾール)、炭化水素樹脂、ケトン樹脂、フェノキシ樹脂、ポリアミド、エチルセルロース、酢酸ビニル、ABS樹脂、ポリウレタン、メラミン樹脂、不飽和ポリエステル樹脂、アルキド樹脂、エポキシ樹脂、シリコン樹脂などが挙げられる。
More preferably, it is 5 nm-1 micrometer, More preferably, it is 10 nm-500 nm. The hole injection layer and the hole transport layer may have a single-layer structure composed of one or more of the materials described above, or may have a multilayer structure composed of a plurality of layers having the same composition or different compositions.
As a method for forming the hole injection layer and the hole transport layer, a vacuum deposition method, an LB method, a method in which the hole injection / transport material is dissolved or dispersed in a solvent (a spin coating method, a casting method, a dip coating method). Etc.), an inkjet method, a printing method, and a transfer method are used. In the case of the coating method, it can be dissolved or dispersed together with the resin component. Examples of the resin component include polyvinyl chloride, polycarbonate, polystyrene, polymethyl methacrylate, polybutyl methacrylate, polyester, polysulfone, polyphenylene oxide, polybutadiene, and poly (N -Vinyl carbazole), hydrocarbon resin, ketone resin, phenoxy resin, polyamide, ethyl cellulose, vinyl acetate, ABS resin, polyurethane, melamine resin, unsaturated polyester resin, alkyd resin, epoxy resin, silicone resin, and the like.
電子注入層、電子輸送層の材料は、陰極から電子を注入する機能、電子を輸送する機能、陽極から注入された正孔を障壁する機能のいずれか有しているものであればよい。その具体例としては、トリアゾール、オキサゾール、オキサジアゾール、イミダゾール、フルオレノン、アントラキノジメタン、アントロン、ジフェニルキノン、チオピランジオキシド、カルボジイミド、フルオレニリデンメタン、ジスチリルピラジン、ナフタレン、ペリレン等の芳香環テトラカルボン酸無水物、フタロシアニン、8−キノリノールの金属錯体やメタルフタロシアニン、ベンゾオキサゾールやベンゾチアゾールを配位子とする金属錯体に代表される各種金属錯体、有機シラン、本発明の化合物、および、それらの誘導体等が挙げられる。電子注入層、電子輸送層の膜厚は特に限定されるものではないが、通常1nm〜5μmの範囲のものが好ましく、 The material for the electron injection layer and the electron transport layer may be any material having any one of a function of injecting electrons from the cathode, a function of transporting electrons, and a function of blocking holes injected from the anode. Specific examples include fragrances such as triazole, oxazole, oxadiazole, imidazole, fluorenone, anthraquinodimethane, anthrone, diphenylquinone, thiopyrandioxide, carbodiimide, fluorenylidenemethane, distyrylpyrazine, naphthalene, and perylene. Various metal complexes represented by cyclic tetracarboxylic acid anhydrides, metal complexes of phthalocyanine, 8-quinolinol, metal phthalocyanines, metal complexes having benzoxazole and benzothiazole as ligands, organic silanes, compounds of the present invention, and Examples thereof include derivatives thereof. The thicknesses of the electron injection layer and the electron transport layer are not particularly limited, but those in the range of usually 1 nm to 5 μm are preferable,
より好ましくは5nm〜1μmであり、更に好ましくは10nm〜500nmである。電子注入層、電子輸送層は上述した材料の1種または2種以上からなる単層構造であってもよいし、同一組成または異種組成の複数層からなる多層構造であってもよい。
電子注入層、電子輸送層の形成方法としては、真空蒸着法やLB法、前記電子注入輸送材料を溶媒に溶解または分散させてコーティングする方法(スピンコート法、キャスト法、ディップコート法など)、インクジェット法、印刷法、転写法などが用いられる。コーティング法の場合、樹脂成分と共に溶解または分散することができ、樹脂成分としては例えば、正孔注入輸送層の場合に例示したものが適用できる。
More preferably, it is 5 nm-1 micrometer, More preferably, it is 10 nm-500 nm. The electron injection layer and the electron transport layer may have a single layer structure composed of one or more of the above-described materials, or may have a multilayer structure composed of a plurality of layers having the same composition or different compositions.
As a method for forming the electron injection layer and the electron transport layer, a vacuum deposition method, an LB method, a method in which the electron injection / transport material is dissolved or dispersed in a solvent (a spin coating method, a casting method, a dip coating method, etc.), An ink jet method, a printing method, a transfer method, or the like is used. In the case of the coating method, it can be dissolved or dispersed together with the resin component. As the resin component, for example, those exemplified in the case of the hole injection transport layer can be applied.
保護層の材料としては水分や酸素等の素子劣化を促進するものが素子内に入ることを抑止する機能を有しているものであればよい。その具体例としては、In、Sn、Pb、Au、Cu、Ag、Al、Ti、Ni等の金属、MgO、SiO、SiO2、Al2O3、GeO、NiO、CaO、BaO、Fe2O3、Y2O3、TiO2等の金属酸化物、MgF2、LiF、AlF3、CaF2等の金属フッ化物、SiNx、SiOxNy などの窒化物、ポリエチレン、ポリプロピレン、ポリメチルメタクリレート、ポリイミド、ポリウレア、ポリテトラフルオロエチレン、ポリクロロトリフルオロエチレン、ポリジクロロジフルオロエチレン、クロロトリフルオロエチレンとジクロロジフルオロエチレンとの
共重合体、テトラフルオロエチレンと少なくとも1種のコモノマーとを含むモノマー混合物を共重合させて得られる共重合体、共重合主鎖に環状構造を有する含フッ素共重合体、吸水率1%以上の吸水性物質、吸水率0.1%以下の防湿性物質等が挙げられる。
As a material for the protective layer, any material may be used as long as it has a function of preventing substances that promote device deterioration such as moisture and oxygen from entering the device. Specific examples thereof include metals such as In, Sn, Pb, Au, Cu, Ag, Al, Ti, and Ni, MgO, SiO, SiO 2 , Al 2 O 3 , GeO, NiO, CaO, BaO, and Fe 2 O. 3 , metal oxides such as Y 2 O 3 , TiO 2 , metal fluorides such as MgF 2 , LiF, AlF 3 , CaF 2 , SiN x , SiO x N y Such as nitride, polyethylene, polypropylene, polymethyl methacrylate, polyimide, polyurea, polytetrafluoroethylene, polychlorotrifluoroethylene, polydichlorodifluoroethylene, copolymer of chlorotrifluoroethylene and dichlorodifluoroethylene, tetrafluoroethylene And a copolymer obtained by copolymerizing a monomer mixture containing at least one comonomer, a fluorine-containing copolymer having a cyclic structure in the copolymer main chain, a water-absorbing substance having a water absorption of 1% or more, a water absorption of 0 .1% or less of moisture-proof substances and the like.
保護層の形成方法についても特に限定はなく、例えば真空蒸着法、スパッタリング法、反応性スパッタリング法、MBE(分子線エピタキシ)法、クラスターイオンビーム法、イオンプレーティング法、プラズマ重合法(高周波励起イオンプレーティング法)、プラズマCVD法、レーザーCVD法、熱CVD法、ガスソースCVD法、コーティング法、印刷法、転写法を適用できる。 There is no particular limitation on the method for forming the protective layer. For example, vacuum deposition, sputtering, reactive sputtering, MBE (molecular beam epitaxy), cluster ion beam, ion plating, plasma polymerization (high frequency excitation ions) Plating method), plasma CVD method, laser CVD method, thermal CVD method, gas source CVD method, coating method, printing method, and transfer method can be applied.
本発明の発光素子は、種々の公知の工夫により、光取り出し効率を向上させることができる。例えば、基板表面形状を加工する(例えば微細な凹凸パターンを形成する)、基板・ITO層・有機層の屈折率を制御する、基板・ITO層・有機層の膜厚を制御すること等により、光の取り出し効率を向上させ、外部量子効率を向上させることが可能である。 The light-emitting element of the present invention can improve the light extraction efficiency by various known devices. For example, by processing the substrate surface shape (for example, forming a fine concavo-convex pattern), controlling the refractive index of the substrate / ITO layer / organic layer, controlling the film thickness of the substrate / ITO layer / organic layer, etc. It is possible to improve light extraction efficiency and external quantum efficiency.
本発明の発光素子は、陽極側から発光を取り出す、いわゆる、トップエミッション方式であっても良い。 The light-emitting element of the present invention may be a so-called top emission type in which light emission is extracted from the anode side.
以下、本発明を実施例に基づきさらに詳細に説明するが、本発明はこれに限定されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to this.
実施例1
化合物A−1の合成
窒素気流下、1,4−ジブロモベンゼン20g、脱水ジエチルエーテル100mlを氷冷し、ここに1.6mol/lのノルマルブチルリチウム/ヘキサン溶液55mlを20分かけて滴下した。滴下終了後、氷浴をはずして室温まで昇温し、さらに攪拌した。30分後再び氷冷して、ここにジクロロジフェニルシラン10.7gを30分かけて滴下し、滴下終了後、室温まで昇温してさらに攪拌を続けた。3時間後、1.0mol/lの塩酸水溶液90mlを滴下し、滴下終了後、さらにクロロホルム200ml、水100mlを加えた。分液して得られた有機層を水洗後、硫酸マグネシウムで乾燥、ろ過後、溶媒を減圧下留去した。得られた白色固体をクロロホルム/メタノール混合溶媒から再結晶することで化合物A−1を15.0g(収率71%)得た。
Example 1
Synthesis of Compound A-1 Under a nitrogen stream, 20 g of 1,4-dibromobenzene and 100 ml of dehydrated diethyl ether were ice-cooled, and 55 ml of a 1.6 mol / l normal butyl lithium / hexane solution was added dropwise over 20 minutes. After completion of the dropwise addition, the ice bath was removed, the temperature was raised to room temperature, and the mixture was further stirred. After 30 minutes, the mixture was ice-cooled again, and 10.7 g of dichlorodiphenylsilane was added dropwise over 30 minutes. After completion of the addition, the temperature was raised to room temperature and stirring was continued. Three hours later, 90 ml of a 1.0 mol / l hydrochloric acid aqueous solution was added dropwise, and after completion of the dropwise addition, 200 ml of chloroform and 100 ml of water were further added. The organic layer obtained by liquid separation was washed with water, dried over magnesium sulfate and filtered, and then the solvent was distilled off under reduced pressure. The obtained white solid was recrystallized from a chloroform / methanol mixed solvent to obtain 15.0 g (yield 71%) of Compound A-1.
実施例2
参考化合物(1−1)の合成
窒素気流下、実施例1で合成した化合物A−1 2.6g、カルバゾール1.8g、2酢酸パラジウム0.08g、炭酸ルビジウム4.1g、トリス−t−ブチルホスフィン0.24g、キシレン50mlを加熱還流し、3時間攪拌した。反応の進行をTLC(薄層クロマトグラフィー)で追跡し、化合物Aの消失を確認した後、反応混合物中にクロロホルム50ml、水50mlを加え、分液した。得られた有機層を硫酸マグネシウムで乾燥させ、ろ過後、溶媒を減圧留去した。得られた固体をカラムクロマトグラフィー(ヘキサン/クロロホルム)で精製した後、ヘキサン/クロロホルム混合溶媒から再結晶することで参考化合物(1−1)を2.6g(収率75%)得た。化合物(1−1)の融点は274℃であった。
Example 2
Synthesis of Reference Compound (1-1) 2.6 g of Compound A-1 synthesized in Example 1 under a nitrogen stream, 1.8 g of carbazole, 0.08 g of palladium acetate, 4.1 g of rubidium carbonate, tris-t-butyl 0.24 g of phosphine and 50 ml of xylene were heated to reflux and stirred for 3 hours. The progress of the reaction was monitored by TLC (thin layer chromatography), and after confirming the disappearance of Compound A, 50 ml of chloroform and 50 ml of water were added to the reaction mixture, followed by liquid separation. The obtained organic layer was dried over magnesium sulfate and filtered, and then the solvent was distilled off under reduced pressure. The resulting solid was purified by column chromatography (hexane / chloroform) and then recrystallized from a hexane / chloroform mixed solvent to obtain 2.6 g (yield 75%) of the reference compound (1-1). The melting point of compound (1-1) was 274 ° C.
実施例3
化合物Bの合成
化合物Bは特開2001−97953号公報に例示化合物(1−1)として記載されており、この文献記載の方法により合成出来た。
Example 3
Synthesis of Compound B Compound B is described as Exemplified Compound (1-1) in JP-A No. 2001-97953 and could be synthesized by the method described in this document.
実施例4
例示化合物(2−1)の合成
窒素気流下、実施例1で合成した化合物A−1 5.0g、実施例2で合成した化合物B 5.4g、2酢酸パラジウム0.11g、トリス−t−ブチルホスフィン0.31g、t−ブトキシナトリウム3.9g、キシレン100mlを加熱還流し、3時間攪拌した。反応の進行をTLC(薄層クロマトグラフィー)で追跡し、化合物Aの消失を確認した後、反応混合物中にクロロホルム100ml、水100mlを加え、分液した。得られた有機層を硫酸マグネシウムで乾燥させ、ろ過後、溶媒を減圧留去した。得られた固体をカラムクロマトグラフィー(ヘキサン/クロロホルム)で精製した後、ヘキサン/クロロホルム混合溶媒から再結晶することで例示化合物(2−1)を4.8g(収率58%)得た。化合物(2−1)の融点は364℃であった。
Example 4
Synthesis of Exemplary Compound (2-1) Under a nitrogen stream, 5.0 g of Compound A-1 synthesized in Example 1, 5.4 g of Compound B synthesized in Example 2, 0.11 g of palladium diacetate, Tris-t- 0.31 g of butylphosphine, 3.9 g of t-butoxy sodium and 100 ml of xylene were heated to reflux and stirred for 3 hours. The progress of the reaction was monitored by TLC (Thin Layer Chromatography), and after confirming the disappearance of Compound A, 100 ml of chloroform and 100 ml of water were added to the reaction mixture for liquid separation. The obtained organic layer was dried over magnesium sulfate and filtered, and then the solvent was distilled off under reduced pressure. The obtained solid was purified by column chromatography (hexane / chloroform) and then recrystallized from a mixed solvent of hexane / chloroform to obtain 4.8 g (yield 58%) of Exemplary Compound (2-1). The melting point of the compound (2-1) was 364 ° C.
参考例1
CV(サイクリックボルタンメトリー)法による酸化波可逆性評価
本参考例は参考化合物のEL素子中での安定性を評価するため行った。
EL素子駆動時、正孔あるいは電子の電荷注入、輸送によって素子中の有機化合物材料は絶えず酸化あるいは還元を受けていると考えることができる。このため素子駆動時の有機化合物材料の安定性を評価するための一つの方法として有機化合物材料のCVを測定することが有効である。
Reference example 1
Evaluation of reversibility of oxidation wave by CV (cyclic voltammetry) method This reference example was carried out in order to evaluate the stability of a reference compound in an EL device.
When the EL element is driven, it can be considered that the organic compound material in the element is constantly oxidized or reduced by charge injection and transport of holes or electrons. Therefore, it is effective to measure the CV of the organic compound material as one method for evaluating the stability of the organic compound material when the element is driven.
すなわちCV法によって得られる酸化波あるいは還元波が可逆であれば、その有機化合物材料は酸化あるいは還元に対して安定あり、さらに掃引を繰り返した場合に酸化波あるいは還元波の最初の波形からの変化が小さければ、その材料は酸化あるいは還元に対してさらに安定であると判断できる。 That is, if the oxidation wave or reduction wave obtained by the CV method is reversible, the organic compound material is stable against oxidation or reduction, and further changes in the oxidation wave or reduction wave from the initial waveform when the sweep is repeated. Is small, it can be judged that the material is more stable against oxidation or reduction.
今回は特に材料の酸化安定性を評価すべく、以下のCV測定条件による酸化波の可逆性評価、および繰り返し掃引による最初の掃引からの波形変化を測定した。 This time, in order to evaluate the oxidation stability of the material in particular, the reversibility evaluation of the oxidation wave under the following CV measurement conditions and the waveform change from the first sweep by repeated sweep were measured.
CV測定測定条件
支持電解質:nBu4N・PF6(0.1M)
作用電極:Pt
対極:Pt
参照電極:SCE
掃引速度:100mV/s
測定範囲:0〜+1.6V vs. SCE
試料溶液としてBenzene−アセトニトリル(1:1)混合溶媒による1.0mM
溶液を調製。調液後メンブレンフィルターによってろ過し、Arバブリングを行った後、測定した。
結果を下表に示す。
CV measurement and measurement conditions Support electrolyte: n Bu 4 N · PF 6 (0.1 M)
Working electrode: Pt
Counter electrode: Pt
Reference electrode: SCE
Sweep speed: 100 mV / s
Measuring range: 0 to +1.6 V vs. SCE
1.0 mM with Benzene-acetonitrile (1: 1) mixed solvent as sample solution
Prepare the solution. After preparation, the solution was filtered through a membrane filter and subjected to Ar bubbling and then measured.
The results are shown in the table below.
上記のように参考化合物(1−1)は比較例の化合物に比べ、CV法による酸化波可逆性が良好であり、繰り返し掃引による波形変化も小さいことが分かった。本結果は参考化合物の酸化安定性が高いことを示すものであり、すなわち参考化合物を用いて作成したEL素子が優れた駆動耐久性を示すことを示唆するものである。
As described above, it was found that the reference compound (1-1) had better oxidation wave reversibility by the CV method and smaller waveform change due to repeated sweeps than the compound of the comparative example. This result shows that the oxidation stability of the reference compound is high, that is, suggests that the EL device prepared using the reference compound exhibits excellent driving durability.
参考例2
洗浄したITO基板を蒸着装置に入れ、まず正孔注入層として銅フタロシアニンを10nm蒸着し、この上に正孔輸送材料としてα−NPD(N,N’−ジフェニル−N,N’−ジ(α−ナフチル)−ベンジジン)を30nm蒸着した。この上に参考化合物(1−1)とIr(ppy)3を9対1の比率(重量比)で30nmの厚さに共蒸着し、この上にBAlqを10nm、続いてAlq3を40nm蒸着した。有機薄膜上にパターニングしたマスク(発光面積が4mm×5mmとなるマスク)を設置し、蒸着装置内でフッ化リチウムを約1nm蒸着し、この上にアルミニウムを膜厚約200nm蒸着して素子を作製した。東陽テクニカ製ソースメジャーユニット2400型を用いて、直流定電圧をEL素子に印加し発光させ、その輝度をトプコン社の輝度計BM−8、発光波長を浜松フォトニクス社製スペクトルアナライザーPMA−11を用いて測定した。
その結果、色度値(0.27、0.62)の緑色発光が得られ、素子の外部量子効率は7.5%であった。本素子の耐久性評価を初期輝度2000cd/m2、電流値一定にて行うと輝度半減時間は約800時間である。
Reference example 2
The cleaned ITO substrate is put in a vapor deposition apparatus, and copper phthalocyanine is first deposited as a hole injection layer to a thickness of 10 nm, and α-NPD (N, N′-diphenyl-N, N′-di (α -Naphthyl) -benzidine) was evaporated 30 nm. On top of this, the reference compound (1-1) and Ir (ppy) 3 were co-deposited in a ratio of 9: 1 (weight ratio) to a thickness of 30 nm, and BAlq was deposited thereon to 10 nm, followed by 40 nm of Alq3. . A patterned mask (a mask with a light emission area of 4 mm x 5 mm) is placed on the organic thin film, lithium fluoride is deposited in a vapor deposition device at about 1 nm, and aluminum is deposited on the film to a thickness of about 200 nm to produce a device. did. Using a source measure unit model 2400 made by Toyo Technica, applying a DC constant voltage to the EL element to emit light, using a luminance meter BM-8 from Topcon and a spectrum analyzer PMA-11 from Hamamatsu Photonics. Measured.
As a result, green light emission with a chromaticity value (0.27, 0.62) was obtained, and the external quantum efficiency of the device was 7.5%. When the durability evaluation of this element is performed at an initial luminance of 2000 cd / m 2 and a constant current value, the luminance half time is about 800 hours.
実施例7
NPDの代わりに化合物(2−1)を用い、参考化合物(1−1)の代わりにCBPを用いて参考例2と同様に素子作製評価した。
その結果、色度値(0.26,0.61)の緑色発光が得られ、素子の外部量子効率は 7.2%であった。本素子の耐久性評価を初期輝度2000cd/m2、電流値一定にて行うと輝度半減時間は約700時間である。
Example 7
The device was evaluated in the same manner as in Reference Example 2 using Compound (2-1) instead of NPD and CBP instead of Reference Compound (1-1).
As a result, green light emission with a chromaticity value (0.26, 0.61) was obtained, and the external quantum efficiency of the device was 7.2%. When the durability evaluation of this element is performed at an initial luminance of 2000 cd / m 2 and a constant current value, the luminance half time is about 700 hours.
比較例1
参考化合物(1−1)の代わりにCBPを用い参考例2と同様に素子作成評価した。その結果色度(0.27,0.62)の緑色発光が得られ、素子の外部量子効率は6.0%であった。本素子の耐久性評価を初期輝度2000cd/m2、電流値一定にて行うと輝度半減時間は約400時間である。
Comparative Example 1
The device was evaluated in the same manner as in Reference Example 2 using CBP instead of the reference compound (1-1). As a result, green light emission of chromaticity (0.27, 0.62) was obtained, and the external quantum efficiency of the device was 6.0%. When the durability evaluation of this element is performed with an initial luminance of 2000 cd / m 2 and a constant current value, the luminance half time is about 400 hours.
比較例2
参考化合物(1−1)の代わりに特許文献1記載の化合物Cを用い、参考例2と同様に素子作成評価した。その結果色度(0.27,0.62)の緑色発光が得られ、素子の外部量子効率は5.0%であった。本素子の耐久性評価を初期輝度2000cd/m2、電流値一定にて行うと輝度半減時間は約200時間である。
同様に、他の本発明の化合物を用いても、高効率発光素子を作製することができる。
Comparative Example 2
A device C was evaluated in the same manner as in Reference Example 2 using Compound C described in Patent Document 1 instead of Reference Compound (1-1). As a result, green light emission of chromaticity (0.27, 0.62) was obtained, and the external quantum efficiency of the device was 5.0%. When the durability evaluation of this element is performed at an initial luminance of 2000 cd / m 2 and a constant current value, the luminance half time is about 200 hours.
Similarly, a high-efficiency light-emitting element can be produced using other compounds of the present invention.
Claims (7)
Compounds represented by a general formula (4).
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