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Axially Chiral Biphenyl Compound-Based Thermally Activated Delayed Fluorescent Materials for High-Performance Circularly Polarized Organic Light-Emitting Diodes.
Advanced Science ( IF 15.1 ) Pub Date : 2020-06-14 , DOI: 10.1002/advs.202000804
Zhen-Long Tu 1 , Zhi-Ping Yan 1 , Xiao Liang 1 , Lei Chen 1 , Zheng-Guang Wu 1 , Yi Wang 1 , You-Xuan Zheng 1 , Jing-Lin Zuo 1 , Yi Pan 1
Affiliation  

To boost intrinsic circularly polarized luminescence (CPL) properties of chiral emitters, an axially chiral biphenyl unit is inlaid in thermally activated delayed fluorescent (TADF) skeleton, urging the participation of chiral source in frontier molecular orbital distributions. A pair of enantiomers, (R )‐BPPOACZ and (S )‐BPPOACZ, containing the cyano as electron‐withdrawing moieties and carbazole and phenoxazine as electron‐donating units are synthesized and separated. The circularly polarized TADF enantiomers exhibit both high photoluminescence quantum yield of 86.10% and excellent CPL activities with maximum dissymmetry factor |g PL| values of almost 10−2 in solution and 1.8 × 10−2 in doped film, which are among the best values of previously reported small chiral organic materials. Moreover, the circularly polarized organic light‐emitting diodes based on the TADF enantiomers achieve the maximum external quantum efficiency of 16.6% with extremely low efficiency roll‐off. Obvious circularly polarized electroluminescence signals with |g EL| values of 4 × 10−3 are also recorded.

中文翻译:

用于高性能圆偏振有机发光二极管的基于轴向手性联苯化合物的热激活延迟荧光材料。

为了增强手性发射体固有的圆偏振发光(CPL)特性,将轴向手性联苯单元镶嵌在热激活延迟荧光(TADF)骨架中,促使手性源参与前沿分子轨道分布。合成并分离了一对对映体(R)-BPPOACZ 和(S)-BPPOACZ,其含有氰基作为吸电子部分以及咔唑和吩恶嗪作为给电子单元。圆偏振TADF对映体同时表现出86.10%的高光致发光量子产率和具有最大不对称因子的优异CPL活性| PL | 在溶液中的值接近10 -2 ,在掺杂薄膜中的值接近1.8×10 -2,这是先前报道的小型手性有机材料的最佳值之一。此外,基于TADF对映体的圆偏振有机发光二极管实现了16.6%的最大外量子效率,并且效率滚降极低。明显的圆偏振电致发光信号| EL | 还记录了4 × 10 -3的值。
更新日期:2020-08-05
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