CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), ZhongGuanCun BeiYiTiao, Beijing 100190, P. R. China.
College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China.
J Phys Chem Lett. 2021 Apr 1;12(12):3135-3141. doi: 10.1021/acs.jpclett.1c00535. Epub 2021 Mar 23.
Photon upconversion based on triplet-triplet annihilation (TTA-UC) has attracted great attention due to its remarkable features including the high upconversion quantum yield, low threshold, and flexible combination of sensitizer and annihilator. Endowing TTA-UC with responsiveness will offer additional application dimensions; however, it is a challenge to develop annihilators with responsive features in the excited triplet state. Here we demonstrate the synthesis and photophysical behaviors of photofluorochromic annihilators derived from fluorescent diarylethenes. A series of turn-on mode fluorescent diarylethenes based on 1,2-bis(2-ethyl-1-benzothiophen-1,1-dioxide-3-yl)perfuorocyclopentene were synthesized, and their photochromism and photofluorochromism behaviors were thoroughly investigated. When sensitized by near-infrared ruthenium phthalocyanine, TTA-UC could be observed under excitation of 730 nm, accompanied by upconverted emission ranging from 500 to 700 nm. Because of the photoresponsive properties of the annihilators, TTA-UC can be switched between "on" and "off" by alternating irradiation of ultraviolet and visible light.
基于三重态-三重态湮灭（TTA-UC）的光子上转换由于其显著的特点，包括高上转换量子产率、低阈值和敏化剂与湮灭剂的灵活组合，引起了极大的关注。赋予 TTA-UC 响应性将提供额外的应用维度；然而，开发具有激发三重态响应性的湮灭剂是一个挑战。在这里，我们展示了源自荧光二噻吩烯的光致变色湮灭剂的合成和光物理行为。一系列基于 1,2-双（2-乙基-1-苯并噻吩-1,1-二氧化物-3-基）全氟环戊烯的开环模式荧光二噻吩烯被合成，并对其光致变色和光致荧光行为进行了深入研究。当用近红外钌酞菁敏化时，在 730nm 的激发下可以观察到 TTA-UC，同时伴随着从 500nm 到 700nm 的上转换发射。由于湮灭剂的光响应特性，TTA-UC 可以通过交替照射紫外线和可见光在“开”和“关”之间切换。
