Ma Liangwei, Cong Muyu, Sun Siyu, Ma Xiang
Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology Shanghai 200237 China
Chem Sci. 2025 Apr 4;16(19):8282-8290. doi: 10.1039/d5sc02149a. eCollection 2025 May 14.
Designing and optimizing efficient organic room-temperature phosphorescent (RTP) materials remains a captivating yet challenging endeavour due to the inherent difficulties in generating and stabilizing triplet excitons. Here, we report a suite of highly efficient phosphors characterized by near-unity intersystem crossing (ISC) yields. Surprisingly, upon doping these dyes into a polyvinyl alcohol matrix, their phosphorescence quantum yields ( ) spanned a wide range from 2.7% to 69.6%, governed by the position of the methyl substituent. Theoretical calculations and experimental results indicate that the variation in phosphorescence efficiency is primarily due to the strong electron-phonon coupling caused by the positional variation of the methyl substituents, rather than common factors such as ISC or energy levels. These findings provide a new insight into the design of high-performance organic RTP dyes.
由于在产生和稳定三重态激子方面存在固有的困难，设计和优化高效的有机室温磷光（RTP）材料仍然是一项引人入胜但具有挑战性的工作。在此，我们报告了一组具有近乎单位系间窜越（ISC）产率特征的高效磷光体。令人惊讶的是，将这些染料掺杂到聚乙烯醇基质中后，它们的磷光量子产率（）范围从2.7%到69.6%，这取决于甲基取代基的位置。理论计算和实验结果表明，磷光效率的变化主要是由于甲基取代基位置变化引起的强电子-声子耦合，而不是诸如ISC或能级等常见因素。这些发现为高性能有机RTP染料的设计提供了新的见解。
