White Polymer Light-Emitting Diodes Based on Exciplex Electroluminescence from Polymer Blends and a Single Polymer

被引:36
作者
Liang, Junfei
Zhao, Sen
Jiang, Xiao-Fang
Guo, Ting
Yip, Hin-Lap
Ying, Lei [1 ]
Huang, Fei [1 ]
Yang, Wei
Cao, Yong
机构
[1] S China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China
基金
中国国家自然科学基金;
关键词
polymer light-emitting diodes; white light-emitting; solution process; exciplex; highly stable electroluminescence; ENERGY-TRANSFER MECHANISM; EMISSION; BLUE; PHOSPHORESCENT; FLUORESCENT; EMITTERS; DEVICES; RECOMBINATION; EFFICIENCY; COMPLEXES;
D O I
10.1021/acsami.5b11926
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this Article, we designed and synthesized a series of polyfluorene derivatives, which consist of the electron-rich 4,4'-(9-alkyl-carbazole-3,6-diyl)bis-(N,N-diphenylaniline) (TPA-Cz) in the side chain and the electron-deficient dibenzothiophene-5,5-dioxide (SO) unit in the main chain. The resulting copolymer PF-T25 that did not comprise the SO unit exhibited blue light-emission with the Commission Internationale de L'Eclairage coordinates of (0.16, 0.10). However, by physically blending PF-T25 with a blue light-emitting SO-based oligomer, a novel low-energy emission correlated to exciplex emerged due to the appropriate energy level alignment of TPA-Cz and the SO-based oligomers, which showed extended exciton lifetime as confirmed by time-resolved photoluminescent spectroscopy. The low-energy emission was also identified in copolymers consisting of SO unit in the main chain, which can effectively compensate for the high-energy emission to produce binary white light-emission. Polymer light-emitting diodes based on the exciplex-type single greenish-white polymer exhibit the peak luminous efficiency of 2.34 cd A(-1) and the maximum brightness of 12 410 cd m(-2), with Commission Internationale de L'Eclairage color coordinates (0.27, 0.39). The device based on such polymer showed much better electroluminescent stability than those based on blending films. These observations indicated that developing a single polymer with the generated exciplex emission can be a novel and effective molecular design strategy toward highly stable and efficient white polymer light-emitting diodes.
引用
收藏
页码:6164 / 6173
页数:10
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