Qin Mengmei, Chu Ya, Wu Zibo, Zhao Guangjiu
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, National Demonstration Center for Experimental Chemistry & Chemical engineering Education, School of Science, Tianjin University, Tianjin 300354, China.
School of Physics Science and Information Technology, Liaocheng University, Liaocheng 252059, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Feb 5;326:125247. doi: 10.1016/j.saa.2024.125247. Epub 2024 Oct 5.
Purely organic room temperature phosphorescence materials (RTP) have attracted much attention recently, but most of them are substituted with heavy atoms to enhance the intersystem crossing (ISC), which requires complicated design and synthesis. Herein, we report four chiral heavy-atom-free small molecules which integrate properties of aggregation and long-lifetime room temperature phosphorescence. The phosphorescence lifetime of synthesized chiral molecules is measured to be 150 ms, and the phosphorescence quantum yield reaches 15 % at room temperature. The twisted chiral conformation of four molecules not only affect aggregation photoluminescence properties but also can synergistically stabilize triplet exciton in the triplet excited states for excellent ISC efficiency. This strategy enriches the application fields of chiral aggregated long-lifetime room temperature phosphorescent materials.
纯有机室温磷光材料（RTP）近年来备受关注，但其中大多数都含有重原子取代基以增强系间窜越（ISC），这需要复杂的设计与合成。在此，我们报道了四种不含重原子的手性小分子，它们兼具聚集特性和长寿命室温磷光性能。所合成的手性分子的磷光寿命测得为150毫秒，室温下磷光量子产率达到15%。这四种分子的扭曲手性构象不仅影响聚集态光致发光性能，还能协同稳定三重激发态中的三重激子，实现优异的ISC效率。该策略丰富了手性聚集态长寿命室温磷光材料的应用领域。
