Intramolecular Charge Transfer Controls Switching Between Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence
Intramolecular Charge Transfer Controls Switching Between Room Temperature Phosphorescence and Thermally Activated Delayed Fluorescence
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分子内电荷转移控制室温磷光和热激活延迟荧光之间的切换
DOI：
10.1002/ange.201809945
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发表时间：
2018
影响因子：
--
通讯作者：
Chen C
中科院分区：
文献类型：
--
作者：
Chen C
吩噻嗪-二苯甲酮衍生物的化学修饰通过选择分子内电荷转移（ICT）态的几何形状来调节三重态的发射行为。平面ICT（PICT）和扭曲ICT（TICT）的基本原理被证明可以选择性地获得室温磷光（RTP）或热激活延迟荧光（TADF），分别。时间分辨光谱和含时密度泛函理论（TD-DFT）对多晶单晶的研究证明了PICT和TICT状态在基础物理学中的作用。这导致了RTP分子OPM，其中三重态贡献了89%的发光，以及同分异构的TADF分子OMP，其中三重态贡献了95%的发光。
Chemical modification of phenothiazine‐benzophenone derivatives tunes the emission behavior from triplet states by selecting the geometry of the intramolecular charge transfer (ICT) state. A fundamental principle of planar ICT (PICT) and twisted ICT (TICT) is demonstrated to obtain selectively either room temperature phosphorescence (RTP) or thermally activated delayed fluorescence (TADF), respectively. Time‐resolved spectroscopy and time‐dependent density functional theory (TD‐DFT) investigations on polymorphic single crystals demonstrate the roles of PICT and TICT states in the underlying photophysics. This has resulted in a RTP moleculeOPM, where the triplet states contribute with 89 % of the luminescence, and an isomeric TADF moleculeOMP, where the triplet states contribute with 95 % of the luminescence.