The relationship between the host structure and optimum doping concentration in red phosphorescent organic light-emitting diodes

被引:6
|
作者
Yook, Kyoung Soo [1 ]
Lee, Jun Yeob [1 ]
机构
[1] Dankook Univ, Dept Polymer Sci & Engn, Yongin 448701, Gyeonggi Do, South Korea
关键词
Red phosphorescent organic light emitting; diodes; Mixed host; Doping concentration; Charge trapping; Electroluminescence; ELECTROLUMINESCENT DEVICES; HIGH-EFFICIENCY;
D O I
10.1016/j.tsf.2011.02.042
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of the host structure on the optimum doping concentration in red phosphorescent organic light-emitting diodes (PHOLEDs) was investigated. A mixed host of the phosphine oxide derivative (SPPO21) and 4.4',4 ''-tris(N-carbazolyl)triphenylamine (TCTA) was used as the host in the red PHOLED and the device performances were studied according to the doping concentration. The device performance of the red PHOLED was optimized at a doping concentration of 2% in the SPPO21 rich red PHOLED, while the device performance was optimized at a doping concentration of 6% in the device with 50% TCTA content. It was found that the optimum doping concentration was determined by the energy transfer and charge trapping. (c) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:4342 / 4346
页数:5
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