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 π-conjugated charge transfer (CT) and spatial CT, show TADF activities with a small singlet-triplet energy difference (ΔEST ) of 0.029 eV and mirror-image circularly polarized luminescence (CPL) activities with large glum 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 gEL values of -1.2×10-2 and +1.4×10-2 , respectively. These are the first CP-OLEDs based on TADF-active enantiomers with efficient blue CPEL.

中文翻译：

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轴向手性TADF活性对映体，设计用于高效的蓝色圆极化电致发光。

提出将手性发射骨架用于轴向手性对映异构体，其在具有圆偏振电致发光（CPEL）的热活化延迟荧光（TADF）中显示活性。设计并合成了一对手性稳定对映体（-）-（S）-Cz-Ax-CN和（+）-（R）-Cz-Ax-CN。对映异构体均表现出分子内π共轭电荷转移（CT）和空间CT表现，其TADF活性具有0.029 eV的小单重态-三重态能量差（ΔEST），并且具有大的glum值的镜像圆偏振发光（CPL）活动。值得注意的是，基于对映体的CP-OLED具有蓝色电致发光，中心位于468 nm，外部量子效率（EQE）分别为12.5和12.7％，并且还显示出强烈的CPEL，gEL值为-1.2×10-2和+ 1.4×10- 2，分别。