文献类型：期刊文献

英文题名：Highly Efficient Room-Temperature Phosphorescence Based on Single-Benzene Structure Molecules and Photoactivated Luminescence with Afterglow

作者：Ma, Liangwei[1];Sun, Siyu[1];Ding, Bingbing[1];Ma, Xiang[1];Tian, He[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Frontiers Sci Ctr Materiobiol & Dynam Chem, Scientist Joint Res Ctr,Key Lab Adv Mat & Feringa, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2021

卷号：31

期号：17

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20210809954162);WOS:【SCI-EXPANDED(收录号:WOS:000619428500001)】；

基金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (21788102, 22020102006, 21722603, and 21871083), Program of Shanghai Academic/Technology Research Leader (20XD1421300), "Shu Guang" project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation (19SG26), the Innovation Program of Shanghai Municipal Education Commission (2017 01-07-00-02-E00010), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：afterglow; heavy‐ atom‐ free; phosphorescence quantum yield; room‐ temperature phosphorescence

摘要：Recently, a remarkable advance has been made for metal-free room-temperature phosphorescence (RTP) crystals with high phosphorescence quantum yield. However, amorphous, especially heavy-atom-free, RTP materials still suffer from low quantum yield due to the transition-forbidden character of phosphorescence and the relatively poor suppression of nonradiative transition in amorphous materials. In this study, a series of single-benzene structure-based high intersystem crossing yield phosphor is obtained. After embedding into polyvinyl alcohol matrix, all these phosphor exhibits efficient phosphorescence emission (CYRILLIC CAPITAL LETTER EFP, up to 44.0%). Besides, photo-switchable phosphorescence emission can be obtained by doping these molecules into a polymethyl methacrylate (PMMA) matrix. The phosphorescence can be gradually switched on by consuming the residual oxygen in the PMMA matrix under continuous UV light irradiation. Furthermore, the phosphorescence will be spontaneously switched off under ambient conditions. Taking advantage of the photoactivation character, this material has potential in information storage and anti-counterfeiting.