Lithium salt doped conjugated polymers as electron transporting materials for highly efficient blue polymer light-emitting diodes

被引：32
|
作者：
Huang, Fei [1 ]
Shih, Ping-I [1 ,2 ]
Liu, Michelle S. [1 ]
Shu, Ching-Fong [2 ]
Jen, Alex K. -Y. [1 ]
机构：
[1] Univ Washington, Inst Adv Mat & Technol, Dept Mat Sci & Engn, Seattle, WA 98195 USA
[2] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 300, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 24期
基金：
美国国家科学基金会;
关键词：
conducting polymers; current density; lithium compounds; organic light emitting diodes; phosphorescence;
D O I：
10.1063/1.3050452
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Highly efficient blue polymer light-emitting diodes (PLEDs) are fabricated using a conjugated polymer, poly[9,9-bis(2-(2-(2-diethanol-amino-ethoxy) ethoxy) ethyl) fluorene-alt-4, 4(')-phenylether] as an electron transporting layer (ETL). It was found that the performance of these blue-emitting devices could be greatly improved if the ETL was doped with LiF or Li2CO3 salts. A bis[(4,6-di-fluorophenyl)-pyridinato-N, C-2] (picolinate) Ir(III) (FIrpic) complex based blue phosphorescent PLED exhibited a maximum luminance efficiency of 20.3 cd/A with a luminance of 1600 cd/m(2) at the current density of 7.9 mA/cm(2) and drive voltage of 8.0 V.
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页数：3
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