Mechanistic insights into intramolecular energy transfer dynamics in photosensitizers for triplet-triplet annihilation upconversion  

三重态-三重态湮灭上转换中光敏剂分子内能量转移动力学机理研究

作　　者：Tingting Fu Yaxiong Wei Xinsheng Xu 扶婷婷;魏亚雄;许新胜(中国科学技术大学物理与电子信息学院,光电信息材料功能调控与应用安徽省重点实验室,芜湖241002)

机构地区：[1]Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials,School of Physics and Electronic Information,Anhui Normal University,Wuhu 241002,China

出　　处：《Chinese Journal of Chemical Physics》2024年第6期701-720,I0041,共21页化学物理学报(英文)

基　　金：supported by the National Natural Science Foundation of China(No.22203004 and No.21927814);the Anhui Normal University 2023 Scholarship and Supplementary Discipline Construction Project(No.2023GFXK160).

摘　　要：Photosensitizers constitute a crucial element in the process of triplet-triplet annihilation upconversion,necessitating robust absorption of visible or near-infrared light,high intersystem crossing efficiency,prolonged triplet state lifetime,and minimal energy dissipation during intersystem crossing and vibrational relaxation.Nonetheless,conventional monomeric photosensitizers frequently fail to simultaneously meet these requirements.In recent years,researchers,including our group,have fabricated photosensitizers that incorporate multiple covalent linkages,such as dyads and triads,which are regarded more likely to achieve comprehensive performance optimization.This review article explores the design and characteristics of recently synthesized dyads and triads photosensitizers that operate on the principles of intramolecular singlet energy transfer and intramolecular triplet energy transfer,demonstrating their outstanding efficacy in high-efficiency triplet-triplet annihilation upconversion.We provide an exhaustive explanation of the design rationales,photophysical,and photochemical properties of these photosensitizers,along with suggestions for the creation of photosensitizers with enhanced performance.Moreover,we discuss potential avenues and opportunities for the future development of triplet-triplet annihilation upconversion technology.光敏剂在三重态-三重态湮灭上转换过程中起着至关重要的作用,它需要具备可见光或近红外光的强吸收能力、高系间窜跃效率、长三重态寿命,以及在系间窜跃和振动弛豫的过程中低能量耗散.然而,传统光敏剂往往无法同时满足这些要求.近年来,多种共价键连接的二联体或三联体光敏剂已被包括我们团队在内的研究人员报道.本文综述了最近报道的基于分子内单线态能量转移和分子内三重态能量转移原理的二联体和三联体光敏剂,这些光敏剂在三重态-三重态湮灭上转换中表现出卓越的性能.本文详细解释了这些光敏剂的设计原理、光物理和光化学性质,并提出了制备性能更优的光敏剂建议.此外,还讨论了三重态-三重态湮灭上转换技术未来发展的潜在途径和机遇.

关 键 词：Triplet-triplet annihilation upconversion Intramolecular singlet energy transfer Intramolecular triplet energy transfer PHOTOSENSITIZER 

分 类 号：O57[理学—粒子物理与原子核物理]