Acta Chimica Sinica ›› 2023, Vol. 81 ›› Issue (5): 445-449.DOI: 10.6023/A23030077 Previous Articles     Next Articles

Article

基于二芳基乙烯的光响应型室温磷光材料

刘懿玮, 马良伟, 王巧纯, 马骧*()   

  1. 结构可控先进功能材料及其制备教育部重点实验室 费林加诺贝尔奖科学家联合研究中心 材料生物学与动态化学前沿科学中心 华东理工大学 化学与分子工程学院 上海 200237
  • 投稿日期:2023-03-10 发布日期:2023-04-10
  • 作者简介:
    庆祝《化学学报》创刊90周年.
  • 基金资助:
    国家自然科学基金项目(21788102); 国家自然科学基金项目(22125803); 国家自然科学基金项目(22020102006); 上海市科技重大专项(2018SHZDZX03); 上海市优秀学术带头人项目(20XD1421300); 中央高校基本科研专项基金; 中国博士后创新人才支持计划(BX20220106); 中国博士后科学基金面上项目(2022M721140)

Light-Responsible Room-Temperature Phosphorescence Materials Based on Diarylethene

Liu Yiwei, Ma Liangwei, Wang Qiaochun, Ma Xiang()   

  1. Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2023-03-10 Published:2023-04-10
  • Contact: *E-mail: maxiang@ecust.edu.cn
  • About author:
    †Dedicated to the 90th anniversary of Acta Chimica Sinica
  • Supported by:
    National Natural Science Foundation of China(21788102); National Natural Science Foundation of China(22125803); National Natural Science Foundation of China(22020102006); Shanghai Municipal Science and Technology Major Project(2018SHZDZX03); Program of Shanghai Academic/Technology Research Leader(20XD1421300); Fundamental Research Funds for the Central Universities; China National Postdoctoral Program for Innovative Talents(BX20220106); China Postdoctoral Science Foundation(2022M721140)

Photochromic molecules show great potential in biological imaging, logic gates, super-resolution imaging and other fields due to the sensitivity, accuracy and penetrability of light. By utilizing their variations on physical properties upon light irradiation, the fluorescence signal of photochromic dyes can be turned on or off accurately by specific wavelength. As an important luminescent dye, organic room-temperature phosphorescence (RTP) materials have attracted great research interest of scientists by the triplet state radiation process, and have potential in sensing, anticounterfeiting, photo-dynamic therapy, and so forth. In this work, we combine the phosphorescence and photochromic properties together by connecting a classic photochromic dye (bithienylethene) with an efficient phosphor (thiochroman-4-one) via sp2 and sp3 linker (BTE1oand BTE2o). These compounds show typical photochromic phenomenon in solution and polymer matrix and have good fatigue resistance. During the irradiation, a clear isosbestic point can be observed, indicating the quantified transition between two isomers. The emission quenching of derivatives is considered as the radiative energy transfer between fluorescent open form and non-fluorescent closed form. It’s interesting that the fluorescence lifetime of BTE1oand BTE2oincreases after ultraviolet (UV) irradiation, which rules out the possibility of non-radiative energy transfer mechanism of the fluorescence quenching phenomena. In the poly(vinyl alcohol) (PVA) matrix, these compounds show decent RTP emission and millisecond level lifetime. And the RTP emission can also be reversibly turned “ON” or “OFF” via irradiation of different wavelengths. It’s very interesting that the phosphorescence lifetime also increases (from 16.1 to 19.4 ms) with the irradiation of UV light, which is identified with the variation of fluorescence lifetime in solution and PVA matrix. The increase of lifetime can rule out the non-radiative energy transfer mechanism for the phosphorescence quenching phenomena. Considering the fluorescence quenching phenomena in tetrahydrofuran (THF) solution, the fluorescence and phosphorescence quenching in PVA matrix should also be attributed to the form conversion and the radiative energy transfer process between open and closed isomers.

Key words: photochromic, room-temperature, phosphorescence, photoresponsive, energy transfer