Efficient white-light-emitting diodes based on polyfluorene doped with fluorescent chromophores

被引：23

作者：

Fan, Suqin ^{[1
]}

Sun, Mingliang ^{[1
]}

Wang, Jian ^{[1
]}

Yang, Wei ^{[1
]}

Cao, Yong ^{[1
]}

机构：

[1] S China Univ Technol, Inst Polymer Opt Elect Mat & Devices, Key Lab Specially Funct Mat, Minist Educ, Guangzhou 510640, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 21期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2812569

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Orange-red emitting small molecule chromorephores, 4,7-di-2-thienyl-2,1,3-benzothiadiazole, 4,7-(2'-diselenophenyl)-2,1,3-benzothiadiazole, and 4,7-bis(N-methylpyrrol-2-yl)-2,1,3-benzo-thiadiazole were synthesized and used for fabrication of fluorescent white-emitting device with polyfluorene (PFO) as host by solution processing. By careful controlling of dopant concentration, balanced narrow band-gap (NGB) electroluminescence (EL) emission can be obtained by solution processing due to the incomplete energy transfer from PFO to narrow band gap molecules. EL spectra of the obtained devices were very stable at a wide range of operating voltage. The best white-emitting device reached luminous efficiency of 7.54 cd/A with the CIE coordinates (0.33, 0.34) at luminance over 1000 cd/m(2). (C) 2007 American Institute of Physics.

引用

页数：3

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