文献类型：期刊文献

英文题名：pH-Responsive amorphous room-temperature phosphorescence polymer featuring delayed fluorescence based on fluorescein

作者：Wang, Guanghui[1];Wang, Zifei[1];Ding, Bingbing[1];Ma, Xiang[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2021

卷号：32

期号：10

起止页码：3039

外文期刊名：CHINESE CHEMICAL LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000722554600017)】；

基金：This report was financially supported by the National Natural Science Foundation of China (Nos. 21788102, 22020102006, 21722603 and 21871083), Shanghai Municipal Science and Technology Major Project (No. 2018SHZDZX03), Program of Shanghai Academic/Technology Research Leader (No. 20XD1421300), `Shu Guang' project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No. 19SG26), the Innovation Program of Shanghai Municipal Education Commission (No. 2017-01-07-00-02-E00010), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Room temperature phosphorescence; pH-Response; Amorphous; Fluorescein; Thermally activated delayed fluorescence

摘要：Numerous researchers have paid attention to achieve metal-free phosphorescence by exploring new structures or new mechanisms. Herein, a facile way is introduced to endow a common fluorescence dye, tetrabromofluorescein (4Br-Flu), some fabulous optical characteristics such as dual emission including thermally activated delayed fluorescence, room-temperature phosphorescence (RTP), and the excellent pH-sensitivity. Shortly, 4Br-Flu with good light-emitting properties is composed into the polymer system. The multiple bromine atoms promote the spin-orbit coupling effect and facilitate triplet excitation. Especially, the hydrogen bonding network of the polymer restricts the molecular motion of 4Br-Flu so that the system can emit long-wavelength RTP when 4Br-Flu is doped into polyvinyl alcohol or co-polymerized with acrylamide. Due to the reversible transformation of protonation and deprotonation, the 4Br-Flu based polymer responded to acid and alkali like a phosphorescent switch which makes it an excellent hydrogen chloride/ammonia gas leak detector in dry environment. (c) 2021 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.