pH-Responsive amorphous room-temperature phosphorescence polymer featuring delayed fluorescence based on fluorescein  

作　　者：Guanghui Wang Zifei Wang Bingbing Ding Xiang Ma 

机构地区：[1]Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Chinese Chemical Letters》2021年第10期3039-3042,共4页中国化学快报（英文版）

基　　金：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);the Fundamental Research Funds for the Central Universities。

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(4 Br-Flu),some fabulous optical characteristics such as dual emission including thermally activated delayed fluorescence,room-temperature phosphorescence(RTP),and the excellent pH-sensitivity.Shortly,4 Br-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 of4 Br-Flu so that the system can emit long-wavelength RTP when 4 Br-Flu is doped into polyvinyl alcohol or co-polymerized with acrylamide.Due to the reversible transformation of protonation and deprotonation,the 4 Br-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.

关 键 词：Room temperature phosphorescence pH-Response AMORPHOUS FLUORESCEIN Thermally activated delayed fluorescence 

分 类 号：TQ317[化学工程—高聚物工业]