Reduced efficiency roll-off in high-efficiency hybrid white organic light-emitting diodes

被引：130

作者：

Schwartz, Gregor ^{[1
]}

Reineke, Sebastian ^{[1
]}

Walzer, Karsten ^{[1
]}

Leo, Karl ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01069 Dresden, Germany

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 05期

关键词：

D O I：

10.1063/1.2836772

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

White organic light emitting diodes harvesting triplet excitons from the fluorescent blue emitter N,N(')-di-1-naphthalenyl-N,N(')-diphenyl-[1,1':4',1 '':4 '',1'"-quaterphenyl]-4,4'-diamine (4P-NPD) are presented. Direct doping of the phosphorescent orange iridium(III)bis(2-methyldibenzo-[f,h]quinoxaline)(acetylacetonate) into 4P-NPD results in a strongly reduced efficiency roll-off as compared to separate emission layers, and yields 49.3 lm W(-1) total external power efficiency (24.1% quantum efficiency) at a luminance of 1000 cd m(-2) [CIE 1931 chromaticity coordinates (0.49,0.41)], measured in an integrating sphere. Introduction of an exciton balancing interlayer improves the chromaticity (0.43,0.43) toward the CIE illuminant A warm white point and keeps a high efficiency of 40.7 lm W(-1), 20.3%. (c) 2008 American Institute of Physics.

引用

页数：3

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