A blue organic light emitting diodes with graded junction

被引：9
作者：
Bai, Yu [1 ,2 ]
Khan, M. A. [1 ]
Zhu, Wen-Qing [1 ,2 ]
Jiang, Xue-Yin [1 ]
Zhang, Zhi-Lin [1 ,2 ]
机构：
[1] Shanghai Univ, Dept Mat Sci, Shanghai 201800, Peoples R China
[2] Shanghai Univ, Key Lab Adv Display & Syst Applicat, Minist Educ, Shanghai 200072, Peoples R China
来源：
DISPLAYS | 2008年 / 29卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Blue OLED; Graded junction; Step barrier; Hole-only device; Stability;
D O I：
10.1016/j.displa.2007.11.001
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
Compared to the conventional hetero-junction OLED (Cell-HJ), a blue OLED with a graded junction in the interface between hole transporting layer (HTL) and emitted layer (EML) exhibited six times higher stability. The study of hole-only devices with graded junction and hetero-junction indicated that graded junction benefit to the hole injection, implying the actual hole barrier decrease. Improvement of lifetime is attributed to the decrease of actual hole barrier, which decrease the produced joule heat in the interface, thus decrease the local aggregation of molecular. However, excess of holes in the device with graded junction caused the decrease of efficiency. In order to increase the electron injection, a step barrier for electron injection was made and the balance of hole and electron was improved, resulting in the increase of efficiency. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：365 / 368
页数：4
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