JP2005220088A - Silicon-containing polyvalent amine, hole transport material composed of the same and organic el element using the same material - Google Patents
Silicon-containing polyvalent amine, hole transport material composed of the same and organic el element using the same material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 56
- 230000005525 hole transport Effects 0.000 title claims abstract description 33
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 150000001412 amines Chemical class 0.000 title claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 25
- 239000010703 silicon Substances 0.000 title claims abstract description 25
- 125000003118 aryl group Chemical group 0.000 claims abstract description 14
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 10
- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 9
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000005284 excitation Effects 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 description 34
- 238000003786 synthesis reaction Methods 0.000 description 34
- 150000001875 compounds Chemical class 0.000 description 25
- 239000010410 layer Substances 0.000 description 17
- 238000005160 1H NMR spectroscopy Methods 0.000 description 13
- 238000000746 purification Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 125000001424 substituent group Chemical group 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 8
- -1 silane compound Chemical class 0.000 description 8
- 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 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 5
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- 238000000921 elemental analysis Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 238000000859 sublimation Methods 0.000 description 4
- 230000008022 sublimation Effects 0.000 description 4
- 238000005092 sublimation method Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 125000003545 alkoxy group Chemical group 0.000 description 3
- 125000004185 ester group Chemical group 0.000 description 3
- 125000005843 halogen group Chemical group 0.000 description 3
- 238000004768 lowest unoccupied molecular orbital Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 description 3
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- UTEBJTKMYMQRIF-UHFFFAOYSA-N bis(4-bromophenyl)-diphenylsilane Chemical compound C1=CC(Br)=CC=C1[Si](C=1C=CC(Br)=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 UTEBJTKMYMQRIF-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010549 co-Evaporation Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical group 0.000 description 2
- 125000001072 heteroaryl group Chemical group 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- NSABRUJKERBGOU-UHFFFAOYSA-N iridium(3+);2-phenylpyridine Chemical compound [Ir+3].[C-]1=CC=CC=C1C1=CC=CC=N1.[C-]1=CC=CC=C1C1=CC=CC=N1.[C-]1=CC=CC=C1C1=CC=CC=N1 NSABRUJKERBGOU-UHFFFAOYSA-N 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 2
- 229940078552 o-xylene Drugs 0.000 description 2
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- BWHDROKFUHTORW-UHFFFAOYSA-N tritert-butylphosphane Chemical compound CC(C)(C)P(C(C)(C)C)C(C)(C)C BWHDROKFUHTORW-UHFFFAOYSA-N 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- UKSZBOKPHAQOMP-SVLSSHOZSA-N (1e,4e)-1,5-diphenylpenta-1,4-dien-3-one;palladium Chemical compound [Pd].C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1.C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1 UKSZBOKPHAQOMP-SVLSSHOZSA-N 0.000 description 1
- SWJPEBQEEAHIGZ-UHFFFAOYSA-N 1,4-dibromobenzene Chemical compound BrC1=CC=C(Br)C=C1 SWJPEBQEEAHIGZ-UHFFFAOYSA-N 0.000 description 1
- OGGKVJMNFFSDEV-UHFFFAOYSA-N 3-methyl-n-[4-[4-(n-(3-methylphenyl)anilino)phenyl]phenyl]-n-phenylaniline Chemical compound CC1=CC=CC(N(C=2C=CC=CC=2)C=2C=CC(=CC=2)C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C=C(C)C=CC=2)=C1 OGGKVJMNFFSDEV-UHFFFAOYSA-N 0.000 description 1
- 125000004800 4-bromophenyl group Chemical group [H]C1=C([H])C(*)=C([H])C([H])=C1Br 0.000 description 1
- VCOONNWIINSFBA-UHFFFAOYSA-N 4-methoxy-n-(4-methoxyphenyl)aniline Chemical compound C1=CC(OC)=CC=C1NC1=CC=C(OC)C=C1 VCOONNWIINSFBA-UHFFFAOYSA-N 0.000 description 1
- RHPVVNRNAHRJOQ-UHFFFAOYSA-N 4-methyl-n-(4-methylphenyl)aniline Chemical compound C1=CC(C)=CC=C1NC1=CC=C(C)C=C1 RHPVVNRNAHRJOQ-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 0 CC=CC=C1N(C)c(cccc2)c2C1=* Chemical compound CC=CC=C1N(C)c(cccc2)c2C1=* 0.000 description 1
- LKHXYNXSPWEGQZ-UHFFFAOYSA-N C[n]1c(cc(cccc2)c2c2)c2c2cc3ccccc3cc12 Chemical compound C[n]1c(cc(cccc2)c2c2)c2c2cc3ccccc3cc12 LKHXYNXSPWEGQZ-UHFFFAOYSA-N 0.000 description 1
- KAHJGJRGKCPWDJ-UHFFFAOYSA-N C[n]1c(nccc2)c2c2c1cncc2 Chemical compound C[n]1c(nccc2)c2c2c1cncc2 KAHJGJRGKCPWDJ-UHFFFAOYSA-N 0.000 description 1
- NLGACPNHPUKXCR-UHFFFAOYSA-N C[n]1c2cc(cccc3)c3cc2c2ccccc12 Chemical compound C[n]1c2cc(cccc3)c3cc2c2ccccc12 NLGACPNHPUKXCR-UHFFFAOYSA-N 0.000 description 1
- SDFLTYHTFPTIGX-UHFFFAOYSA-N C[n]1c2ccccc2c2ccccc12 Chemical compound C[n]1c2ccccc2c2ccccc12 SDFLTYHTFPTIGX-UHFFFAOYSA-N 0.000 description 1
- MABOIYXDALNSES-UHFFFAOYSA-N C[n]1c2cnccc2c2ccccc12 Chemical compound C[n]1c2cnccc2c2ccccc12 MABOIYXDALNSES-UHFFFAOYSA-N 0.000 description 1
- NVSXQUCPVQBLSB-UHFFFAOYSA-N C[n]1c2ncccc2c2ccccc12 Chemical compound C[n]1c2ncccc2c2ccccc12 NVSXQUCPVQBLSB-UHFFFAOYSA-N 0.000 description 1
- HBCXEOYIFJPBJP-UHFFFAOYSA-N C[n]1c2ncccc2c2cccnc12 Chemical compound C[n]1c2ncccc2c2cccnc12 HBCXEOYIFJPBJP-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 125000000304 alkynyl group Chemical group 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000005577 anthracene group Chemical group 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- 150000007860 aryl ester derivatives Chemical class 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- OSXYHAQZDCICNX-UHFFFAOYSA-N dichloro(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](Cl)(Cl)C1=CC=CC=C1 OSXYHAQZDCICNX-UHFFFAOYSA-N 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004770 highest occupied molecular orbital Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000010898 silica gel chromatography Methods 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
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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Abstract
Description
本発明は、ケイ素含有多価アミン、それよりなる最低励起三重項エネルギー準位を有するホール輸送材料およびそれを用いた有機EL素子に関する。 The present invention relates to a silicon-containing polyvalent amine, a hole transport material having the lowest excited triplet energy level, and an organic EL device using the same.
従来燐光素子を作製するに当っては、これまで蛍光素子に用いられていた下記式
特許文献1には、下記一般式
で示される特定のシラン化合物からなる発光素子材料及びそれを含有する発光素子に関する発明が開示されているが、リン光素子(特に青色)の高効率化に重要な最低励起三重項エネルギー準位や電気化学特性であるエネルギーギャップの広さに関しては記載も示唆もない。
Are disclosed, and a light-emitting device material comprising the specific silane compound and a light-emitting device containing the same are disclosed. However, the lowest excited triplet energy level important for improving the efficiency of phosphorescent devices (especially blue) and There is no description or suggestion regarding the wide energy gap, which is an electrochemical property.
特許文献2では、1対の電極間に発光層または発光層を含む複数の有機化合物層を形成した発光素子において、特定の多環芳香族化合物と特定の有機ケイ素誘導体を含む発光素子について記載されているが、有機ケイ素誘導体はホスト材料としての使用を開示しているに過ぎない。
特許文献3には、発光材料とホスト材料とを含有する発光層を少なくとも有し、発光極大波長が500nm以下であり、且つ前記ホスト材料の最低励起三重項エネルギー準位が前記発光材料の最低励起三重項エネルギー準位よりも高いことを特徴とする発光素子が開示されている。
より具体的には、前記発光層を発光材料(ゲスト材料)と該発光材料の最低励起三重項エネルギー準位(T1)よりも高いT1を有するホスト材料とで構成しているものであり、ここにおいて有機ケイ素誘導体は発光層に隣接する層に含まれる成分として例示されているにとどまり、ホール輸送材料としての使用は全く示唆されていない。
More specifically, the light emitting layer includes a light emitting material (guest material) and a host material having T 1 higher than the lowest excited triplet energy level (T 1 ) of the light emitting material. Here, the organosilicon derivative is only exemplified as a component contained in a layer adjacent to the light emitting layer, and its use as a hole transport material is not suggested at all.
本発明の目的は、ホール輸送材料の三重項励起準位を向上させる目的として広いエネルギーギャップを有するホール輸送材料、すなわちエネルギーギャップが3.0eVより広いエネルギーギャップを有するケイ素含有ホール輸送材料として有用なケイ素含有多価アミン、それよりなるホール輸送材料およびそれを用いた高効率(青色)燐光有機EL素子を提供する点にある。 The object of the present invention is useful as a hole transport material having a wide energy gap for the purpose of improving the triplet excitation level of the hole transport material, that is, a silicon-containing hole transport material having an energy gap wider than 3.0 eV. The object is to provide a silicon-containing polyvalent amine, a hole transport material comprising the same, and a high-efficiency (blue) phosphorescent organic EL device using the same.
本発明の第1は、下記一般式(1)
で示されるケイ素含有多価アミンに関する。
本発明の第2は、3.0eVよりも広いエネルギーギャップを有するものである請求項1記載のケイ素含有多価アミンに関する。
本発明の第3は、請求項1または2記載のケイ素含有多価アミンよりなるホール輸送材料に関する。
本発明の第4は、請求項1または2記載のケイ素含有多価アミンを用いたことを特徴とする有機EL素子に関する。
本発明の第5は、請求項1または2記載のケイ素含有多価アミンをホール輸送層に用いたことを特徴とする有機EL素子に関する。
本発明の第6は、発光材料が燐光材料である請求項5記載の有機EL素子に関する。
本発明の第7は、その発光ピーク波長が480nmよりも短波長である青色発光を示す前記燐光材料である請求項6記載の有機EL素子に関する。
The first of the present invention is the following general formula (1)
It is related with the silicon-containing polyvalent amine shown by these.
The second aspect of the present invention relates to the silicon-containing polyvalent amine according to
A third aspect of the present invention relates to a hole transport material comprising the silicon-containing polyvalent amine according to
A fourth aspect of the present invention relates to an organic EL device using the silicon-containing polyvalent amine according to
The fifth aspect of the present invention relates to an organic EL device characterized in that the silicon-containing polyvalent amine according to
A sixth aspect of the present invention relates to the organic EL element according to
A seventh aspect of the present invention relates to the organic EL element according to
本発明で用いる一般式(1)の化合物の製造方法は下記のとおりである。
前記反応は、パラジウム〔例えば、塩化パラジウム、酢酸パラジウム、ビス(ジベンジリデンアセトン)パラジウム〕触媒あるいは銅粉存在下、塩基性条件、不活性ガス(例えば、窒素、アルゴン)下の反応であり、反応溶媒としては一般的な芳香族溶媒を使用することが可能で、具体的には、トルエン、キシレン、N,N−ジメチルホルムアミド、ニトロベンゼン、テトラリンなどが使用でき、反応温度は室温から300℃、好ましくは60℃から200℃、より好ましくは100℃から150℃にて行なう。
Ar1、Ar2、Ar3およびAr4の好ましい具体例としては、下記式群
からそれぞれ独立して選ばれた基である。なお、これらの芳香族環や複素環には必要に応じて任意の置換基を有することができる。これらの置換基としては、アルキル基、アルコキシ基、エステル基およびハロゲン基などを挙げることができる。
また、Ar1とAr2あるいはAr3とAr4が結合した場合の形としてはAr1とAr2あるいはAr3とAr4が結合しているN原子も含めてその構造例を示すと
The reaction is a reaction under a basic condition and inert gas (for example, nitrogen, argon) in the presence of a palladium [for example, palladium chloride, palladium acetate, bis (dibenzylideneacetone) palladium] catalyst or copper powder. As the solvent, a general aromatic solvent can be used. Specifically, toluene, xylene, N, N-dimethylformamide, nitrobenzene, tetralin, and the like can be used, and the reaction temperature is from room temperature to 300 ° C., preferably Is carried out at 60 ° C to 200 ° C, more preferably 100 ° C to 150 ° C.
As preferable specific examples of Ar 1 , Ar 2 , Ar 3 and Ar 4 ,
Are independently selected groups. In addition, these aromatic rings and heterocyclic rings can have an arbitrary substituent as necessary. Examples of these substituents include alkyl groups, alkoxy groups, ester groups, and halogen groups.
In addition, when Ar 1 and Ar 2 or Ar 3 and Ar 4 are bonded, the structure example including N 1 where Ar 1 and Ar 2 or Ar 3 and Ar 4 are bonded is shown.
R1とR2におけるアルキル基およびAr1〜Ar4における置換基としてのアルキル基としては、炭素数が好ましくは1〜20、より好ましくは1〜10、さらにより好ましくは1〜6であり、それぞれ直鎖状であっても、枝分かれしていても良い。その例としては、−CH3、−C2H5、−CH2CH2CH3、−CH(CH3)2、
−CH2(CH2)2CH3、−C(CH3)3、−CH2(CH2)3CH3、
−CH2(CH2)4CH3などを挙げることができる。
R1とR2におけるアリール基としては、置換基を有することもあるモノ、ジ、トリあるいはテトラフェニル基、置換基を有することもあるナフタリン基、アンスラセン基などを挙げることができ、前記置換基としては前記アルキル基、そのアルコキシ基、後述のエステル基、ハロゲン基などを挙げることができる。
R1とR2のアリール基における置換基およびAr1〜Ar4の置換基としてのアルコキシ基としては、炭素数が好ましくは1〜20、より好ましくは1〜10、さらにより好ましくは1〜6であり、それぞれ直鎖状であっても、枝分かれしていても良い。その例としては、
−OCH3、−OC2H5、−OCH2CH2CH3、−OCH(CH3)2、
−OCH2(CH2)2CH3、−OC(CH3)3、−OCH2(CH2)3CH3、
−OCH2(CH2)4CH3、−OC6H5などを挙げることができる。
R1とR2のアリール基における置換基およびAr1〜Ar4における置換基としてのエステル基としては、炭素数1〜10、好ましくは1〜6よりなるアルキルエステルあるいはアリールエステルを挙げることができ、その例としては、
−COOCH3、−COOC2H5、−COOCH2CH2CH3、
−COOCH(CH3)2、−COOCH2(CH2)2CH3、
−COOC(CH3)3、−COOCH2(CH2)3CH3、
−COOCH2(CH2)4CH3、−COOC6H5などを挙げることができる。
R1とR2のアリール基における置換基およびAr1〜Ar4における置換基としてのハロゲン基としては、すべてのハロゲン元素を挙げることができる。
The alkyl group in R 1 and R 2 and the alkyl group as a substituent in Ar 1 to Ar 4 preferably have 1 to 20, more preferably 1 to 10, still more preferably 1 to 6 carbon atoms, Each may be linear or branched. Examples thereof, -CH 3, -C 2 H 5 , -CH 2
-CH 2 (CH 2) 2 CH 3, -C (CH 3) 3, -CH 2 (CH 2) 3
Such as -CH 2 (CH 2) 4 CH 3 and the like.
Examples of the aryl group in R 1 and R 2 include a mono, di, tri, or tetraphenyl group that may have a substituent, a naphthalene group that may have a substituent, an anthracene group, and the like. Examples thereof include the alkyl group, an alkoxy group thereof, an ester group described later, and a halogen group.
The alkoxy group as the substituent in the aryl group of R 1 and R 2 and the substituent of Ar 1 to Ar 4 preferably has 1 to 20, more preferably 1 to 10, and even more preferably 1 to 6 carbon atoms. Each of them may be linear or branched. For example,
-OCH 3, -OC 2 H 5, -OCH 2 CH 2 CH 3, -OCH (CH 3) 2,
-OCH 2 (CH 2) 2 CH 3, -OC (CH 3) 3, -OCH 2 (CH 2) 3
-OCH 2 (CH 2) 4 CH 3, and the like -OC 6 H 5.
Examples of the substituent in the aryl group of R 1 and R 2 and the ester group as the substituent in Ar 1 to Ar 4 include alkyl esters or aryl esters having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms. For example,
-COOCH 3, -COOC 2 H 5, -COOCH 2 CH 2 CH 3,
-COOCH (CH 3) 2, -COOCH 2 (CH 2) 2 CH 3,
-COOC (CH 3) 3, -COOCH 2 (CH 2) 3 CH 3,
-COOCH 2 (CH 2) 4 CH 3, and the like -COOC 6 H 5.
Examples of the halogen group as the substituent in the aryl group of R 1 and R 2 and the substituent in Ar 1 to Ar 4 include all halogen elements.
本発明のケイ素含有多価アミンの具体的化合物を下記に例示する。
本発明の化合物は、例えばAlq3(発光材料兼電子輸送材料)との素子構成で素子を作成することにより、効率のよいホール輸送性能を示すことを見出し、ホール輸送材料としての用途を開発できた。さらに、この化合物が3.0eVより大きなエネルギーギャップを有するという特徴を活かし、近年、研究が進められている燐光素子、好ましくは青色燐光素子に用いることにより、燐光素子の高効率化を実現することができた。エネルギーギャップが広いと、それに伴い三重項励起準位も高くなることが期待できる。三重項励起準位向上が燐光素子の高効率化に重要であることから、エネルギーギャップを広くすることで燐光素子の高効率化につながる。 The compound of the present invention has been found to exhibit efficient hole transport performance by creating a device with a device configuration of, for example, Alq 3 (light emitting material / electron transport material), and can be used as a hole transport material. It was. Furthermore, taking advantage of the feature that this compound has an energy gap larger than 3.0 eV, it is possible to achieve high efficiency of the phosphorescent device by using it in a phosphorescent device which has been studied recently, preferably a blue phosphorescent device. I was able to. If the energy gap is wide, it can be expected that the triplet excitation level will increase accordingly. Since the improvement of the triplet excitation level is important for improving the efficiency of the phosphorescent device, widening the energy gap leads to higher efficiency of the phosphorescent device.
以下に合成例、実施例を挙げて本発明を説明するが、本発明はこれにより何ら限定されるものではない。 Hereinafter, the present invention will be described with reference to synthesis examples and examples, but the present invention is not limited thereto.
合成例1〔ビス(4−ブロモフェニル)ジフェニルシランの合成〕
合成例2〔4,4′−ジ−(ジフェニルアミノ)−テトラフェニルシランの合成〕
さらにトレイン−サブリメーション法により昇華精製を行った(精製収率69%)。
Synthesis Example 2 [Synthesis of 4,4'-di- (diphenylamino) -tetraphenylsilane]
Further, sublimation purification was performed by a train-sublimation method (purification yield 69%).
合成例3〔4,4′−ジ−(カルバゾイル)−テトラフェニルシランの合成〕
さらにトレイン−サブリメーション法により昇華精製を行った(精製収率72%)。
Synthesis Example 3 [Synthesis of 4,4′-di- (carbazoyl) -tetraphenylsilane]
Further, sublimation purification was performed by a train-sublimation method (purification yield: 72%).
合成例4〔4,4′−ジ−(p,p′−ジトリルアミノ)−テトラフェニルシランの合成〕
さらにトレイン−サブリメーション法により昇華精製を行った(精製収率75%)。
Synthesis Example 4 [Synthesis of 4,4′-di- (p, p′-ditolylamino) -tetraphenylsilane]
Further, sublimation purification was performed by a train-sublimation method (purification yield: 75%).
合成例5〔4,4′−ジ−(p,p′−ジメトキシジフェニルアミノ)−テトラフェニルシランの合成〕
さらにトレイン−サブリメーション法により昇華精製を行った(精製収率74%)。
Synthesis Example 5 [Synthesis of 4,4′-di- (p, p′-dimethoxydiphenylamino) -tetraphenylsilane]
Further, sublimation purification was performed by a train-sublimation method (purification yield: 74%).
本発明の合成例2〜5で得られた化合物の電気化学特性および熱特性を測定した。 The electrochemical characteristics and thermal characteristics of the compounds obtained in Synthesis Examples 2 to 5 of the present invention were measured.
実施例1
洗浄および前処理を施したITO基板上に、真空蒸着により、合成例2で得られた化合物もしくは合成例3で得られた化合物もしくは合成例4で得られた化合物あるいは合成例5で得られた化合物を500Å、下記式
The compound obtained in Synthesis Example 2, the compound obtained in Synthesis Example 3, the compound obtained in Synthesis Example 4, or the compound obtained in Synthesis Example 5 was obtained by vacuum deposition on the cleaned and pretreated ITO substrate. 500Å of compound, the following formula
実施例2
洗浄および前処理を施したITO基板上に、下記式
On the cleaned and pretreated ITO substrate, the following formula
実施例3
洗浄および前処理を施したITO基板上に、前記TPDPES20mgおよび前記TBPAH2mgを1,2−ジクロロエタン4mlに溶解した液をスピンコートすることにより厚さ200Å成膜した。さらに、その上に、真空蒸着により、合成例2で得られた化合物もしくは合成例4で得られた化合物を300Å、下記式
A 200-mm-thick film was formed by spin-coating a solution prepared by dissolving 20 mg of TPDPES and 2 mg of TBPAH in 4 ml of 1,2-dichloroethane on an ITO substrate that had been cleaned and pretreated. Furthermore, 300 Å of the compound obtained in Synthesis Example 2 or the compound obtained in Synthesis Example 4 by the vacuum vapor deposition, the following formula
比較例1
実施例3において合成例2で得られた化合物あるいは合成例4で得られた化合物の代わりにα−NPDを用いた以外はすべて同条件で素子作製を行い、実施例3と同様に青色燐光素子構造に於けるホール輸送性能を評価した。その結果を表6および図6〜8に示す。
In Example 3, a device was manufactured under the same conditions except that α-NPD was used instead of the compound obtained in Synthesis Example 2 or the compound obtained in Synthesis Example 4, and a blue phosphorescent device was obtained in the same manner as in Example 3. The hole transport performance in the structure was evaluated. The results are shown in Table 6 and FIGS.
実施例4
実施例3においてFIrpicの代わりに下記式
In Example 3, instead of FIrpic, the following formula
比較例2
実施例4において合成例2で得られた化合物あるいは合成例4で得られた化合物の代わりにα−NPDを用いた以外はすべて同条件で素子作製を行い、実施例4と同様に緑色燐光素子構造に於けるホール輸送性能を評価した。その結果を表8および図12〜14に示す。
Comparative Example 2
In Example 4, a device was fabricated under the same conditions except that α-NPD was used instead of the compound obtained in Synthesis Example 2 or the compound obtained in Synthesis Example 4, and a green phosphorescent device was obtained in the same manner as in Example 4. The hole transport performance in the structure was evaluated. The results are shown in Table 8 and FIGS.
実施例5
洗浄および前処理を施したITO基板上に、前記TPDPES20mgおよび前記TBPAH2mgを1,2−ジクロロエタン4mlに溶解した液をスピンコートすることにより厚さ200Å成膜した。さらに、その上に、真空蒸着により、合成例4で得られた化合物を300Å、下記式
A 200-mm-thick film was formed by spin-coating a solution prepared by dissolving 20 mg of TPDPES and 2 mg of TBPAH in 4 ml of 1,2-dichloroethane on an ITO substrate that had been cleaned and pretreated. Furthermore, 300Å of the compound obtained in Synthesis Example 4 was formed by vacuum vapor deposition, and the following formula
表3は、最も簡単なAlq3(発光材料兼電子輸送材料)との二層型素子を作成することにより、本件ケイ素含有多価アミンがすぐれたホール輸送性能を示すことを確認したものである。表3の素子は駆動電圧が少し高いため、ホール注入層(TPDPES:TBPAH)を設けた素子構造にすることにより低電圧化を行った。その結果が表4である。表3に較べ表4では、発光開始電圧および最高輝度時の印加電圧の低下が見られ、それに伴い最高輝度も向上している。
さらに、本件ケイ素含有多価アミンを燐光素子に用いた場合のデータが表5である。
これまで用いられていたα−NPDのデータ(表6)と比較した場合、素子特性が向上していることが明らかである。
本件ケイ素含有多価アミンを緑色燐光素子に用いた場合のデータが表7である。
これまで用いられていたα−NPDのデータ(表8)と比較した場合、素子特性が向上していることが明らかである。
表9では、燐光材料のホスト材料にCzTTを用い、電子輸送層にはホールブロック性の高いt−BuTAZを用いたことにより、燐光材料とのHOMO、LUMOレベルが各材料間において最適化され、電荷の注入ロスが低減され、t−BuTAZのホールブロック効果により電荷の突き抜けが抑えられ、電荷の再結合が発光材料中で確実に行なわれる結果、最大外部量子効率が12%を超える高い性能を得ることができた。
本件ケイ素含有多価アミンを緑色燐光素子のホール輸送層に用いた場合においても高効率化を実現している。
本件ケイ素含有多価アミンは、エネルギーギャップが広いことを特徴とするが、それに伴い、表1に示すように電子親和力(Ea)の値がα−NPDに比べて小さくなっている。言い換えれば、最低空軌道(LUMO)レベルが高くなっている。
LUMOレベルが高くなることにより効果的に電子が発光層でブロックされ、高効率発光が得られることになる。
近年、発光材料として燐光材料が注目されるようになってから燐光素子(とくに青色)の高効率化が多々研究されている。本件ケイ素含有多価アミンを燐光素子のホール輸送層に用いた場合に高効率化を実現しているため、本件ケイ素含有多価アミンのホール輸送材料としての有用性は明白である。
Table 3 confirms that the silicon-containing polyvalent amine exhibits excellent hole transport performance by creating a two-layer device with the simplest Alq 3 (light emitting material / electron transport material). . Since the driving voltage of the elements shown in Table 3 was slightly high, the voltage was reduced by using an element structure provided with a hole injection layer (TPDPES: TBPAH). The results are shown in Table 4. In Table 4, as compared with Table 3, the emission start voltage and the applied voltage at the maximum luminance are decreased, and the maximum luminance is improved accordingly.
Further, Table 5 shows data obtained when the silicon-containing polyvalent amine was used in a phosphorescent device.
When compared with the α-NPD data (Table 6) used so far, it is apparent that the device characteristics are improved.
Table 7 shows data when the silicon-containing polyvalent amine was used in a green phosphorescent device.
When compared with the α-NPD data used so far (Table 8), it is apparent that the device characteristics are improved.
In Table 9, by using CzTT as the host material of the phosphorescent material and using t-BuTAZ having a high hole blocking property for the electron transport layer, the HOMO and LUMO levels with the phosphorescent material are optimized between the materials. Charge injection loss is reduced, charge penetration is suppressed by the hole blocking effect of t-BuTAZ, and charge recombination is reliably performed in the luminescent material. As a result, the maximum external quantum efficiency exceeds 12%. I was able to get it.
Even when the silicon-containing polyvalent amine is used in the hole transport layer of the green phosphorescent element, high efficiency is realized.
The present silicon-containing polyvalent amine is characterized by a wide energy gap, and accordingly, as shown in Table 1, the value of electron affinity (Ea) is smaller than that of α-NPD. In other words, the lowest empty orbit (LUMO) level is high.
By increasing the LUMO level, electrons are effectively blocked by the light emitting layer, and high efficiency light emission can be obtained.
In recent years, since phosphorescent materials have attracted attention as light-emitting materials, many studies have been made on improving the efficiency of phosphorescent elements (especially blue). When the present silicon-containing polyvalent amine is used in the hole transport layer of the phosphorescent device, high efficiency is realized, and therefore the usefulness of the present silicon-containing polyvalent amine as a hole transport material is clear.
Claims (7)
で示されるケイ素含有多価アミン。 The following general formula (1)
A silicon-containing polyvalent amine represented by
The organic EL device according to claim 6, wherein the phosphorescent material exhibits blue light emission whose emission peak wavelength is shorter than 480 nm.
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