Highly efficient blue electrophosphorescent devices with a novel host material

被引：64

作者：

Lei, GT ^{[1
]}

Wang, LD ^{[1
]}

Duan, L ^{[1
]}

Wang, JH ^{[1
]}

Qiu, Y ^{[1
]}

机构：

[1] Tsinghua Univ, Minist Educ, Key Lab Organ Optoelect & Mol Sci, Beijing 100084, Peoples R China

来源：

SYNTHETIC METALS | 2004年 / 144卷 / 03期

基金：

中国国家自然科学基金;

关键词：

organic light-emitting diode; electrophosphorescence; host; exothermic energy transfer;

D O I：

10.1016/j.synthmet.2004.03.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Highly efficient blue electrophosphorscent light emitting diodes with a new host material N,N'-dicarbazolyl-1,4-dimethene-benzene (DCB) were demonstrated. The energy transfer mechanism of the host-guest material system consisting of DCB and bis[(4,6-difluorophenyl)-pyridinato-N,C-2'] (picolinato) Ir(III) (FIrpic) is an exothermic process. The device with a configuration of indium tin oxide/ N,N'-diphenyl-N,N'-bis(1,1'-biphenyl)-4,4'-diamine (NPB)/DCB:FIrpic/4,7-diphenyl-1,10-phenanthroline(BPhen)/Mg:Ag was optimized by adjusting the thickness of emitting layer and the dopant concentration. The device with the 8% (weight ratio) FIrpic and 30 nm emitting layer exhibits the maximum external quantum efficiency and current efficiency of 5.8% and 9.8 cd/A, respectively, at the luminance of 22 cd/m(2) driven at the voltage of 6.0 V. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：249 / 252

页数：4

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