Heavy atom-free triplet photosensitizer based on thermally activated delayed fluorescence material for NIR-to-blue triplet-triplet annihilation upconversion  

作　　者：Hui Liang Xiaoyu Liu Liting Tang Zafar Mahmood Zeduan Chen Guowei Chen Shaomin Ji Yanping Huo 

机构地区：[1]School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Chinese Chemical Letters》2023年第2期403-406,共4页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China (Nos. 21975053, 21975055, U2001222);Guangdong Basic and Applied Basic Research Foundation (Nos. 2019B1515120023, 2022B1515020041);Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) for financial support。

摘　　要：Triplet-triplet annihilation(TTA) upconversion-based materials have potential application in the broad range of research areas, including photocatalysis and life sciences. However, near-infrared(NIR)-to-blue upconverted emission is preferred for most of the practical applications, but developing a NIR-to-blue TTA upconversion system is a challenging task in photochemistry. In this work, a thermally activated delayed fluorescence(TADF) material with intense visible-to-NIR absorption is demonstrated that shows a longer triplet state lifetime(32 μs) and high triplet state energy(E_(T)= 1.55 e V). For the first time, a heavy atomfree NIR(λ_(ex)> 650 nm) to blue(λ_(em)< 460 nm) TTA upconversion system was devised, employing the dimeric borondifluoride curcuminoid TADF material as triplet photosensitizer(PS) and a large anti-Stokes shift(0.88 e V) along with moderate upconversion yield was achieved. Our work provides the solution and guidance for the future development of purely organic heavy atom-free NIR activating TTA upconversion system for a wide array of applications.

关 键 词：Heavy atom-free Triplet state PHOTOSENSITIZER TTA-upconversion 

分 类 号：TB34[一般工业技术—材料科学与工程]