Application of alternating fluorene and thiophene copolymers in polymer light-emitting diodes

被引:35
作者
Liu, B
Niu, YH
Yu, WL
Cao, Y
Huang, W
机构
[1] Inst Mat Res & Engn, Singapore 117602, Singapore
[2] S China Univ Technol, Coll Mat Sci, Guangzhou 510640, Peoples R China
基金
中国国家自然科学基金;
关键词
fluorene; thiophene; light-emitting diode;
D O I
10.1016/S0379-6779(02)00014-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Four polyfluorene copolymers comprised of fluorene and thiophene or bithiophene moieties were investigated and applied for device fabrication. Relatively high photoluminescence quantum yields (23-40%), good optical and electrochemical properties have been demonstrated for this series of polymers. Single and double layer devices fabricated with the polymers in a conventional configuration appeared to have electrons as the majority carrier, and their performance was remarkably improved when poly(3,4-ethylenedioxythiophene) (PEDOT) was selected as the hole-injection/transporting layer. The best performance was demonstrated for a double layer green-emitting device, which exhibited luminescence of 356 cd/m(2) at a bias of 8 V with an external efficiency of 0.38%. The current-voltage and luminescence characteristics of the devices with PEDOT or poly(N-vinylcarbazole) (PVK) as the buffer layer were studied and discussed. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:129 / 134
页数:6
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