文献类型：期刊文献

英文题名：Manipulating room-temperature phosphorescence by electron-phonon coupling

作者：Ma, Liangwei[1];Cong, Muyu[1];Sun, Siyu[1];Ma, Xiang[1]

机构：[1]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem & Mol Engn, Key Lab Adv Mat & Joint Int Res Lab Precis Chem &, Shanghai 200237, Peoples R China

年份：2025

卷号：16

期号：19

起止页码：8282

外文期刊名：CHEMICAL SCIENCE

收录：;EI(收录号：20251618272989);WOS:【SCI-EXPANDED(收录号:WOS:001463833400001)】；

基金：We gratefully acknowledge the financial support from the National Natural Science Foundation of China (22125803, T2488302, 22020102006 and 22305080), Science and Technology Commission of Shanghai Municipality (Grant No. 24DX1400200), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Alkylation - Electron-phonon interactions - Phosphors - Quantum yield - Semiconductor doping

摘要：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 (Phi P) 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.