Promoting near-infrared II fluorescence efficiency by blocking long-range energy migration

作     者：Changjin Ou Lei An Ziqi Zhao Fan Gao Liangyu Zheng Chao Xu Kang Zhang Jinjun Shao Linghai Xie Xiaochen Dong 

作者机构：Institute of Advanced Materials and Flexible Electronics(IAMFE)School of Chemistry and Materials ScienceNanjing University of Information Science and TechnologyNanjingChina State Key Laboratory of Organic Electronics and Information Displays and Institute of Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjingChina Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM)Nanjing Tech University(NanjingTech)NanjingChina School of Chemistry and Materials ScienceJiangsu Normal UniversityXuzhouChina 

出 版 物：《Aggregate》 (聚集体（英文）)

年 卷 期：2023年第4卷第3期

页      面：102-109页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

基　　金：NNSF,Grant/Award Numbers:62120106002,22175089 Jiangsu Provincial Policy Key Research and Development Plan,Grant/Award Numbers:BE2021711,BE2022812 open research fund of State Key Laboratory of Organic Electronics and Information Displays Startup Foundation for Introducing Talent of NUIST,Grant/Award Number:2021r089 

主　　题：co-planar structure dipole-dipole interaction fluorescence quenching molecular doping NIR-II fluorophore 

摘      要：Generally,long wavelength absorbed near-infrared II(NIR-II)dyes have a low fluorescence efficiency in aggregate states for aggregate-caused quenching effect,simultaneously enhancing efficiency and extending absorption is a challenging issue for NIR-II ***,three benzo[1,2-c:4,5-c’]bis[1,2,5]thiadiazole(BBT)derivatives(TPA-BBT,FT-BBT,and BTBT-BBT)are used to clarify fluorescence quenching *** the BBT derivatives are doped into a small molecule matrix,they show quite different fluorescence *** TPA-BBT displays fluorescence quenching originating from short-range exchange interaction,while FT-BBT and BTBT-BBT with a co-planar-conjugated backbone exhibit concentration-dependent quenching processes,namely changing from long-range dipole-dipole interaction to exchange interaction,which could be majorly ascribed to large spectral overlap between absorption and *** precisely tuning doping concentration,both FT-BBT and BTBT-BBT nanoparticles(NPs)present the optimal NIR-II fluorescence brightness at∼2.5 wt%doping *** doped NPs have good biocompatibility and could be served as fluorescence contrast agents for vascular imaging with a high resolution under 980-nm laser *** paradigms evidence that molecular doping can promote fluorescence efficiency of long wavelength-absorbed NIR-II fluorophores via suppressing long-range energy migration.