Enhanced efficiency in nondoped, blue organic light-emitting diodes utilizing simultaneously local excition and two charge-transfer exciton from benzimidazole-based donor–acceptor molecules
作者:Xinhua Ouyang、Xingye Zhang、Ziyi Ge
DOI:10.1016/j.dyepig.2013.11.023
日期:2014.4
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
同时利用所有电荷转移激子和局部激子是获得高效荧光有机发光二极管(FOLED)的途径。在这里,扭曲分子内电荷转移状态(TICT状态),平面分子内电荷转移状态(ICT状态)和局部激发态(LE状态)被证明可以增强荧光发射体中单重态激子的发生,它们基于苯并咪唑和三苯胺供体-受体衍生物。系统地研究了合成,光物理和电致发光(EL)性能。具有特殊的TICT和ICT特性的荧光发射器(TPABBBI和TPABBI)通过从电荷转移激子到辐射单重态激子的分子内转化实现电子-空穴(e-h)重组。对于TPABBBI来说,m为3.56 cd / A,3.11 lm / W,对于TPABBI为4.23%),高亮度下的低效率滚降和稳定的蓝色发射。