Improving efficiency of organic light-emitting devices by optimizing the LiF interlayer in the hole transport layer

被引：0
|
作者：
焦志强 [1 ,2 ,3 ]
吴晓明 [1 ,2 ,3 ]
华玉林 [1 ,2 ,3 ]
董木森 [1 ,2 ,3 ]
苏跃举 [1 ,2 ,3 ]
申利莹 [1 ,2 ,3 ]
印寿根 [1 ,2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Tianjin University of Technology
[2] Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education
[3] Tianjin Key Laboratory for Photoelectric Materials and Devices
来源：
Chinese Physics B | 2011年 / 20卷 / 10期
基金：
中国国家自然科学基金;
关键词：
organic light-emitting devices; LiF; interlayer; efficiency;
D O I：
暂无
中图分类号：
TN383 [发光器件];
学科分类号：
0803 ;
摘要：
The efficiency of organic light-emitting devices (OLEDs) based on N,N’-bis(1-naphthyl)-N,N’-diphenyl-N,1’- biphenyl-4,4’-diamine (NPB) (the hole transport layer) and tris(8-hydroxyquinoline) aluminum (Alq 3 ) (both emission and electron transport layers) is improved remarkably by inserting a LiF interlayer into the hole transport layer. This thin LiF interlayer can effectively influence electrical performance and significantly improve the current efficiency of the device. A device with an optimum LiF layer thickness at the optimum position in NPB exhibits a maximum current efficiency of 5.96 cd/A at 215.79 mA/cm 2 , which is about 86% higher than that of an ordinary device (without a LiF interlayer, 3.2 cd/A). An explanation can be put forward that LiF in the NPB layer can block holes and balance the recombination of holes and electrons. The results may provide some valuable references for improving OLED current efficiency.
引用
收藏
页码：426 / 429
页数：4
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