文献类型：期刊文献

英文题名：Efficient Visible-Light-Activated Ultra-Long Room-Temperature Phosphorescence Triggered by Multi-Esterification

作者：Yu, Jiahong[1,2];Sun, Zhiyu[1,2];Ma, Huili[3,4];Wang, Chengyun[1,2];Huang, Wenbin[5];He, Zikai[3,4];Wu, Wenjun[1,2];Hu, Honglong[1,2];Zhao, Weijun[1,2];Zhu, Wei-Hong[1,2]

机构：[1]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Key Lab Adv Mat,Shanghai Key Lab Funct Mat Chem,Fr, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem Frontiers Sci, Feringa Nobel Prize Scientist Joint Res Ctr, Joint Int Res Lab Precis Chem & Mol Engn,Ctr Mater, Shanghai 200237, Peoples R China;[3]Nanjing Tech Univ, Key Lab Flexible Elect, Jiangsu Natl Synergist Innovat Ctr Adv Mat, Nanjing 211816, Peoples R China;[4]Nanjing Tech Univ, Inst Adv Mat, Jiangsu Natl Synergist Innovat Ctr Adv Mat, Nanjing 211816, Peoples R China;[5]Harbin Inst Technol Shenzhen, Sch Sci, Shenzhen 518055, Peoples R China

年份：2023

卷号：62

期号：52

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20234715101223);WOS:【SCI-EXPANDED(收录号:WOS:001107095700001)】；

基金：The authors are grateful to financial support from the National Natural Science Foundation of China (9235630033, 22105069), Shanghai Pujiang Program (20PJ1402900), Shanghai Natural Science Foundation (21ZR1418400), Innovation Program of Shanghai Municipal Education Commission (2023FGS01).

语种：英文

外文关键词：Amorphous Phosphorescent Film; Encryption; Organic Room-Temperature Phosphorescence; Ultra-Long Lifetimes; Visible-Light Excitation

摘要：The development of ultra-long room-temperature phosphorescence (UL-RTP) in processable amorphous organic materials is highly desirable for applications in flexible displays, anti-counterfeiting, and bio-imaging. However, achieving efficient UL-RTP from amorphous materials remains a challenging task, especially with activation by visible light and a bright afterglow. Here we report a general and rational molecular-design strategy to enable efficient visible-light-excited UL-RTP by multi-esterification of a rigid large-plane phosphorescence core. Notably, multi-esterification minimizes the aggregation-induced quenching and accomplishes a ' four birds with one stone ' possibility in the generation and radiation process of UL-RTP: i) shifting the excitation from ultraviolet light to blue-light through enhancing the transition dipole moment of low-lying singlet-states, ii) facilitating the intersystem crossing process through the incorporation of lone-pair electrons, iii) boosting the decay process of long-lived triplet excitons resulting from a significantly increased transition dipole moment, and iv) reducing the intrinsic triplet nonradiative decay by substitution of high-frequency vibrating hydrogen atoms. All these factors synergistically contribute to the most efficient and stable visible-light-stimulated UL-RTP (lifetime up to 2.01 s and efficiency up to 35.4 % upon excitation at 450 nm) in flexible films using multi-esterified coronene, which allows high-tech applications in single-component time-delayed white light-emitting diodes and information technology based on flashlight-activated afterglow encryption. A general and rational molecular-design strategy has been developed to enable visible-light excited ultra-long room-temperature phosphorescence (UL-RTP). The multi-esterification strategy boosts transition dipole moments, leading to the most efficient UL-RTP in flexible films upon excitation with blue light, which allows high-tech applications in time-delayed white LEDs and flashlight-activated afterglow encryption.image