Improving efficiency of organic light-emitting devices by optimizing the LiF interlayer in the hole transport layer |
| |
| Authors: | Jiao Zhi-Qiang Wu Xiao-Ming Hua Yu-Lin Dong Mu-Sen Su Yue-Ju Shen Li-Ying Yin Shou-Gen |
| |
| Affiliation: | School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin 300384, China; Tianjin Key Laboratory for Photoelectric MatTianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin 300384, China |
| |
| Abstract: | 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 (Alq3) (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/cm2, 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. |
| |
| Keywords: | organic light-emitting devices LiF interlayer efficiency |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|
