Enhanced efficiency in nondoped, blue organic light-emitting diodes utilizing simultaneously local excition and two charge-transfer exciton from benzimidazole-based donor-acceptor molecules
Enhanced efficiency in nondoped, blue organic light-emitting diodes utilizing simultaneously local excition and two charge-transfer exciton from benzimidazole-based donor-acceptor molecules
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利用来自苯并咪唑基供体-受体分子的同时局部激发和两个电荷转移激子提高非掺杂蓝色有机发光二极管的效率
DOI：
10.1016/j.dyepig.2013.11.023
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发表时间：
2014-04-01
影响因子：
4.5
通讯作者：
Ge, Ziyi
中科院分区：
文献类型：
--
作者：
Ouyang, Xinhua;Zhang, Xingye;Ge, Ziyi
同时利用所有的电荷转移激子和局域激子是获得高效率荧光有机电致发光器件（FOLED）的途径。在这里，一个扭曲的分子内电荷转移态（TICT状态），平面的分子内电荷转移态（ICT状态），和局部激发态（LE状态）被证明，以提高单重态激子的荧光发射体，这是基于苯并咪唑和三苯胺的供体-受体衍生物的发生。系统地研究了其合成、物理性质和电致发光性能。TPABBBI和TPABBBI具有特殊的TICT和ICT特性，通过分子内电荷转移激子到辐射单重态激子的转换实现电子-空穴复合。基于它们的器件显示出高效率（TPABBBI为5.1 cd/A，5.77 lm/W，5.66%的EQE（m）; TPABBBI为3.56 cd/A，3.11 lm/W，4.23%），在高亮度下的低效率滚降和稳定的蓝光发射。皇冠版权所有（C）2013由爱思唯尔有限公司出版。保留所有权利。
The simultaneous utilization of all charge-transfer excitons and local excitons is the pathway to obtain the high efficiency fluorescent organic light-emitting diodes (FOLEDs). Here, a twisted intramolecular charge transfer state (TICT-state), a planar intramolecular charge transfer state (ICT-state), and a locally excited state (LE-state) are demonstrated to enhance the occurrence of singlet excitons in the fluorescent emitters, which are based on benzimidazole and triphenylamine donor-acceptor derivatives. The synthesis, photophysics and electroluminescent (EL) performance are studied systematically. The fluorescence emitters (TPABBBI and TPABBI) with the special TICT and ICT characteristics realize the electron-hole (e-h) recombination via intramolecular conversion from charge-transfer excitons to radiative singlet exciton. The devices based on them show high efficiency (5.1 cd/A, 5.77 lm/W, 5.66% of EQE(m) for TPABBBI and 3.56 cd/A, 3.11 lm/W, 4.23% for TPABBI), low efficiency roll-off at high luminance and stable blue emission. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.