How temperature and hydrostatic pressure impact organic room temperature phosphorescence from H-aggregation of planar triarylboranes and the application in bioimaging  

作　　者：Liangjing Tu Yuanyuan Fan Changjiang Bi Leyi Xiao Yonggang Li Aisen Li Weilong Che Yujun Xie Yufeng Zhang Shuping Xu Weiqing Xu Qianqian Li Zhen Li 

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]State Key Laboratory of Supramolecular Structure and Materials,College of Chemistry,Jilin University,Changchun 130012,China [4]School and Hospital of Stomatology,Wuhan University,Wuhan 430079,China [5]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University Binhai New City,Fuzhou 350027,China [6]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Tianjin University,Tianjin 300072,China

出　　处：《Science China Chemistry》2023年第3期816-825,共10页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21905198);the Starting Grants of Tianjin University,Tianjin Government.

摘　　要：Highly efficient persistent organic room temperature phosphorescence(RTP) has attracted increasing attention because of promising applications in fields of chemical sensors, optoelectronic devices, information security, and bioimaging, etc. Wherein,the crystal engineering of H-aggregation offers stabilization for long-lived triplet exciton for RTP, but the related research is rare because of the scarcity of ideal phosphorescent H-aggregate. Herein, we designed planar tricoordinate organoboron derivatives with molecular arrangement in ideal H-aggregation. The integration of Br atom can largely enhance RTP efficiency through increasing SOC effect, while the antiparallel molecular arrangement causes annihilation of triplet exciton. Thanks to good selfassembly property, their RTP can even be observed in PMMA matrix with doping ratio of merely 1 wt%. We further found that the cryogenic temperature contributes to stabilizing triplet exciton in H-aggregation, leading to red-shifted phosphorescence. By applying high hydrostatic pressure, the phosphorescence was largely enhanced and redshifted, demonstrating the crucial role of H-aggregation on RTP property. In phosphorescent tissue imaging of live mouse, nanoparticles of BrBA exhibited high contrast image via eliminating the interference of autofluorescence.

关 键 词：room temperature phosphorescence H-AGGREGATION planar triarylboranes BIOIMAGING 

分 类 号：TQ427.26[化学工程]