Axially Chiral TADF-Active Enantiomers Designed for Efficient Blue Circularly Polarized Electroluminescence
Axially Chiral TADF-Active Enantiomers Designed for Efficient Blue Circularly Polarized Electroluminescence
复制标题
轴向手性 TADF — 活性对映体，专为高效蓝色圆偏振电致发光而设计
DOI：
10.1002/anie.201914249
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发表时间：
2020-01-24
影响因子：
16.6
通讯作者：
Chen, Chuan-Feng
中科院分区：
文献类型：
--
作者：
Li, Meng;Wang, Yin-Feng;Chen, Chuan-Feng
The use of a chiral, emitting skeleton for axially chiral enantiomers showing activity in thermally activated delayed fluorescence (TADF) with circularly polarized electroluminescence (CPEL) is proposed. A pair of chiral stable enantiomers, (-)-(S)-Cz-Ax-CN and (+)-(R)-Cz-Ax-CN, was designed and synthesized. The enantiomers, both exhibiting intramolecular pi-conjugated charge transfer (CT) and spatial CT, show TADF activities with a small singlet-triplet energy difference (Delta E-ST) of 0.029 eV and mirror-image circularly polarized luminescence (CPL) activities with large g(lum) values. Notably, CP-OLEDs based on the enantiomers feature blue electroluminescence centered at 468 nm with external quantum efficiencies (EQEs) of 12.5 and 12.7 %, and also show intense CPEL with g(EL) values of -1.2x10(-2) and +1.4x10(-2), respectively. These are the first CP-OLEDs based on TADF-active enantiomers with efficient blue CPEL.
