Highly efficient solution-processed blue-green to red and white light-emitting diodes using cationic iridium complexes as dopants
Highly efficient solution-processed blue-green to red and white light-emitting diodes using cationic iridium complexes as dopants
复制标题
使用阳离子铱配合物作为掺杂剂的高效溶液加工蓝绿光至红光和白光发光二极管
DOI：
10.1016/j.orgel.2010.04.018
复制
发表时间：
2010-07-01
影响因子：
3.2
通讯作者：
Qiu, Yong
中科院分区：
文献类型：
--
作者：
He, Lei;Duan, Lian;Qiu, Yong
Using cationic iridium complexes as dopants and poly(N-vinylcarbazole) as host, highly efficient blue-green to red and white organic light-emitting diodes (OLEDs) have been fabricated by a solution process. In single-layer devices, electron-trapping by complexes dominates the device performance. Complexes with cyclometalated 2-phenylpyridine ligands show better device performance compared with those containing cyclometalated 2-(2,4-difluorophenyl)pyridine ligands. With the addition of an electron-transporting/exciton-blocking layer, the devices show improved performances, achieving peak current efficiencies of 24.3, 25.3, 20.5, and 4.2 cd A(-1) for the blue-green, green, yellow, and red electroluminescence, respectively. White OLEDs have been fabricated by co-doping blue-green and red-emitting complexes, attaining a peak current efficiency of 20.7 cd A(-1). Thus, cationic iridium complexes can be used as dopants in solution-processed OLEDs, as well as in light-emitting electrochemical cells, to achieve highly efficient blue-green to red and white electroluminescence. (c) 2010 Elsevier B.V. All rights reserved.
