Effects of charge balance on device performances in deep blue phosphorescent organic light-emitting diodes

被引：48
作者：
Lee, Jonghee [1 ]
Lee, Jeong-Ik [1 ]
Lee, Joo-Won [1 ]
Chu, Hye Yong [1 ]
机构：
[1] Elect & Telecommun Res Inst, Convergence Components & Mat Res Lab, Taejon 305350, South Korea
来源：
ORGANIC ELECTRONICS | 2010年 / 11卷 / 07期
关键词：
Organic light-emitting diodes (OLEDs); Phosphorescent; Mixed host structure; Deep blue; Roll-off; HIGH-EFFICIENCY; EMISSION; ELECTROPHOSPHORESCENCE; CARRIER; ENERGY;
D O I：
10.1016/j.orgel.2010.04.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The performances of deep blue phosphorescent organic light-emitting diodes (PHOLEDs) have been investigated by changing the combination and the composition of host materials in a mixed host emissive layer (EML). An electron transport-type host material of m-bis-(triphenylsilyl) benzene (UGH3), was combined with an hole transport-type host materials, N,N'-dicarbazolyl-3,5-benzene (mCP) or 4,4',4 ''-tris(N-carbazolyl)triphenylamine (TcTa) both doped with a deep blue electro-phosphorescent dopant of iridium(III)bis(4',6'-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6). We found that a mixed host structure was effective to control the charge carrier injection and transport in EML. Therefore, we obtained highly improved efficiency in deep blue PHOLEDs with peak external quantum and luminance efficiencies of 22.9% and 39.2 lm/W with maintaining Commission Internationale de L'Eclairage (CIE) coordinates of (x = 0.163, y = 0.287). (c) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：1159 / 1164
页数：6
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