Yang Zhiqiang, Fu Zhiyuan, Liu Haichao, Wu Min, Li Nan, Wang Kai, Zhang Shi-Tong, Zou Bo, Yang Bing
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University Changchun 130012 China
State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China
Chem Sci. 2023 Feb 17;14(10):2640-2645. doi: 10.1039/d3sc00172e. eCollection 2023 Mar 8.
The pressure-dependent luminescence behavior of purely organic compounds is an important topic in the field of stimulus-responsive smart materials. However, the relevant studies are mainly limited to the investigation of fluorescence properties, while room-temperature phosphorescence (RTP) of purely organic compounds has not been investigated. Here, we filled in this gap regarding pressure-dependent RTP by using a model molecule selenanthrene (SeAN) with a folded geometry. For the first time to the best of our knowledge, a unique phenomenon involving pressure-induced RTP enhancement was discovered in an SeAN crystal, and an underlying mechanism involving folding-induced spin-orbit coupling enhancement was revealed. Pressure-induced RTP enhancement was also observed in an analog of SeAN also showing a folded geometry, but in this case yielded a white-light emission that is very rare in purely organic RTP-displaying materials.
纯有机化合物的压力依赖性发光行为是刺激响应智能材料领域的一个重要课题。然而，相关研究主要局限于荧光性质的研究，而纯有机化合物的室温磷光（RTP）尚未得到研究。在此，我们通过使用具有折叠几何结构的模型分子硒蒽（SeAN）填补了关于压力依赖性RTP的这一空白。据我们所知，首次在SeAN晶体中发现了一种独特的现象，即压力诱导的RTP增强，并揭示了一种涉及折叠诱导自旋轨道耦合增强的潜在机制。在同样呈现折叠几何结构的SeAN类似物中也观察到了压力诱导的RTP增强，但在这种情况下产生了白光发射，这在纯有机RTP显示材料中非常罕见。
