Efficient photo-induced RTP materials based on phenothiazine and polycyclic aromatic hydrocarbons:Tunable emission color and thermal stimulus response  

基于吩噻嗪和多环芳烃的高效光诱导室温磷光材料:可调发光颜色和热刺激响应

作　　者：Jiayi Liang Jie Yang Yunsheng Wang Mingda Shan Zhenjiang Liu Jia Ren Manman Fang Zhen Li 梁嘉怡;杨杰;王云生;单鸣达;刘振江;任佳;方曼曼;李振(Institute of Molecular Aggregation Science,Tianjin University,Tianjin 300072,China;Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials,Department of Chemistry,Wuhan University,Wuhan 430072,China;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China)

机构地区：[1]Institute of Molecular Aggregation Science,Tianjin University,Tianjin 300072,China [2]Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials,Department of Chemistry,Wuhan University,Wuhan 430072,China [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China

出　　处：《Science China Materials》2024年第9期2778-2788,共11页中国科学（材料科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China(52273191,22235006);the Natural Science Foundation of Tianjin City(22JCYBJC00760);the Starting Grants of Tianjin University and Tianjin Government;the Independent Innovation Fund of Tianjin University(2023XPD-0014)。

摘　　要：The development of photo-responsive room temperature phosphorescence(RTP)materials has attracted more and more attention for their broad application pro-spects.Until now,it is still difficult to obtain the related ma-terials with both high efficiency and long lifetime.And the lacking of emission in blue and red regions also largely re-stricts their further applications.In this work,we reported a new strategy to maintain both high efficiency and long lifetime in RTP luminogens through the integration of phenothiazine to facilitate n-π*transition and polycyclic aromatic hydro-carbons(PAHs)dominated byπ-π*transition.When they were doped into polymer matrix,full color photo-induced RTP materials were obtained for the changedπ-conjugation of PAHs.Among them,PTri@PVP showed the best RTP per-formance with phosphorescence efficiency of 20.73%and lifetime up to 819 ms.Specifically,after turning off the ul-traviolet-visible(UV)irradiation upon this system,time-de-pendent phosphorescence afterglow from green to blue was exhibited,which was found to originate from two distinct molecular conformations and could be further regulated by thermal stimulus.Accordingly,multiple anti-counterfeiting applications,including screen printing,multi-color patterns and multi-dimensional information encryption,were suc-cessfully demonstrated.光响应室温磷光材料因其广阔的应用前景而受到越来越多的关注.迄今为止,人们仍难以获得兼具高效率和长寿命的磷光材料.蓝光和红光材料的缺乏在很大程度上限制了室温磷光材料的应用.在该工作中,我们报导了一种构筑高效光诱导室温磷光材料的新策略,即通过具有n-π*跃迁的吩噻嗪和以π-π*跃迁主导的多环芳烃相结合,来维持磷光分子的高效率和长寿命.当把这些材料掺杂进聚合物基体中时,由于多环芳烃的π共轭结构变化,我们获得的掺杂体系可以获得红-绿-蓝(RGB)发射色.其中,PTri@PVP的室温磷光性能最好,磷光量子产率为20.73%,寿命长达819毫秒.此外,在停止紫外线照射后,该体系会出现由绿变蓝的随时间变化的磷光余辉,这源于两种不同的分子构象,并可通过热刺激进一步调节.基于这些材料,我们成功实现了其包括丝网印刷、多色图案和多维信息加密在内的多种防伪应用.

关 键 词：CONFORMATION phenothiazine derivatives room-temperature phosphorescence dual RTP emissions 

分 类 号：TQ422[化学工程]