Enhanced quantum efficiency in polymer electroluminescence devices by inserting an ultrathin PMMA layer

被引：8
|
作者：
Xu, Denghui [1 ]
Deng, Zhenbo [1 ]
Li, Xiufang [1 ]
Chen, Zheng [1 ]
Liang, Chunjun [1 ]
机构：
[1] Beijing Jiaotong Univ, Inst Optoelect Technol, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2007年 / 253卷 / 07期
基金：
中国国家自然科学基金;
关键词：
electroluminescence; light-emitting diodes; exciton;
D O I：
10.1016/j.apsusc.2006.07.018
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report an increase of electroluminescence (EL) efficiency by about two times for poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) based polymer light-emitting diodes (PLED) while employing an ultrathin layer of poly(methyl methacrylate) (PMMA) between a hole injection layer, polyethylenedioxythiophenne:polystyrenesulfonate (PEDOT:PSS) and an emitting layer, MEH-PPV The peak power efficiency of the control device (ITO/MEH-PPV/LiF/Al) was 0.42 lm/W with a current efficiency of 0.66 cd/A. The device with the optimized thickness of PMMA interface layer shows the highest power efficiency of 1.15 lm/W at a current efficiency exceeding 1.83 cd/A. The significant improvement in the device performance is attributed to the decrease of holes injection and the promotion of electrons injection, which cause the balance of the carriers within the emitting layer. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：3378 / 3381
页数：4
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