Dipyrazolopyridine derivatives as bright blue electroluminescent materials

被引:124
作者
Tao, YT [1 ]
Balasubramaniam, E
Danel, A
Tomasik, P
机构
[1] Acad Sinica, Inst Chem, Taipei, Taiwan
[2] Univ Agr, Dept Chem, PL-31120 Krakow, Poland
关键词
D O I
10.1063/1.1288811
中图分类号
O59 [应用物理学];
学科分类号
摘要
Very bright blue organic light emitting diodes were fabricated using highly fluorescent dipyrazolopyridine derivatives, 4-(4-substituted phenyl)-1,7-diphenyl-3,5-dimethyl-1,7dihydrodipyrazolo[3,4-b,4',3'-e]pyridine (PAP-X, X=CN, Ph, and OMe), as emitter by doping the dye in an electron-transporting host, 2,2',2 "-(1,3,5-benzenetriyl)tris-[1-phenyl-1H-benzimidazole] (TPBI). Two hole-transporting layers, 4,4'-bis[N-(1-naphthyl-1-)-N-phenyl-amino]-biphenyl (NPB) and 4,4'-dicarbazolyl-1,1'-biphenyl (CBP) were used to achieve the emission from PAP-X. The devices with a general configuration of indium tin oxide/NPB/CBP/TPBI:PAP(2%)/Mg:Ag showed a bright blue emission. The PAP-CN-based device is exceptionally good, with a brightness of 11 200 cd/m(2) at 14.2 V and the peak external quantum efficiency of 3.2%. The efficiency is the highest for the blue emission. (C) 2000 American Institute of Physics. [S0003-6951(00)01833-7].
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页码:933 / 935
页数:3
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