Multilayer cathode for organic light-emitting devices

被引：0
|
作者：
Li, Xiufang [1 ]
Deng, Zhenbo [1 ]
Chen, Zheng [1 ]
Shi, Yumeng [1 ]
Xu, Denghui [1 ,2 ]
机构：
[1] Beijing Jiaotong Univ, Inst Optoelect Technol, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China
[2] Beijing Technol & Business Univ, Dept Math & Phys, Beijing 100037, Peoples R China
来源：
DISPLAYS | 2008年 / 29卷 / 04期
关键词：
Organic light-emitting devices (OLEDs); Electroluminescence (EL); Exciton;
D O I：
10.1016/j.displa.2007.09.015
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
A thin layer of samarium (Sm) was introduced in the cathode fabrication of the organic light-emitting devices (OLEDs). An efficient cathode Sm/LiF/Al used to improve the performance of OLEDs was reported. Standard N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl 4,4'-diamine (NPB)/tris-(8-hydroxyquinoline) aluminum (AlQ) devices with Sm/LiF/Al cathode showed dramatically enhanced electroluminescent (EL) brightness and efficiency. The optimized device with the 0.5 nm layer of Sm with the cathode structure of Sm/LiF/Al showed the improved power efficiency of 40% than the control device of the conventional LiF/Al cathode at 100 mA/cim(2). The drive voltage of the device with the Sm/LiF/Al cathode was decreased about 2 V at 500 mA/cm(2) compared with the conventional LiF/Al cathode device. The enhanced properties of the device with such a multilayer cathode are considered to the improved balance of electron/hole injection in the emitting layer. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：323 / 326
页数：4
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