A Chiral Cocrystal Strategy Producing Room‐Temperature Phosphorescence and Enhancing Circularly Polarized Luminescence

作者：Chenfei Yang, Siyao Fu, Shouzhen Li, Fei Li, Yi Su, Tingting Li, Huapeng Liu, Xiaotao Zhang, Wenping Hu · 发表于：Advanced Optical Materials · 年份：2024 · DOI：10.1002/adom.202402522 · 被引用次数：14 · 研究领域：Luminescence and Fluorescent Materials、Synthesis and Properties of Aromatic Compounds、Perovskite Materials and Applications

Abstract The maintenance of triplet excitons to produce room‐temperature phosphorescence while simultaneously improving the luminescence dissymmetry factor (g lum ) and photoluminescence quantum yield (PLQY) makes the preparation of circularly polarized room‐temperature phosphorescence (CP‐RTP) materials challenging. Herein, two chiral cocrystals are reported with CP‐RTP using S/R‐1‐(1‐Naphthyl)ethanol (S/R‐1‐nea) as the donor and 1,2,4,5‐Tetracyanobenzene (TCNB) as the acceptor. Simultaneous enhancement of g lum and PLQY is accomplished, with the greatest phosphorescence in the PLQY of ≈31% and |g lum | of 0.065, which is one of the highest |g lum | in cocrystals. Doping two chiral cocrystals into the polyvinyl alcohol (PVA) matrix resulted in polymer films with circularly polarized long afterglow luminescence, indicating the potential for multilevel encryption applications. This study provides a novel approach to achieve the dual improvement of g lum and phosphorescence PLQY, and broadens the application prospects of CP‐RTP materials.