Indexed by:期刊论文

Date of Publication:2014-07-02

Journal:JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:136

Issue:26

Page Number:9256-9259

ISSN No.:0002-7863

Abstract:Reversible photoswitched triplet triplet annihilation upconversion (TTA UC) was demonstrated with dithienylethene (DTE) derivatives as the photochromic units, 2,6-diiodoBodipy as the triplet photosensitizer, and perylene as the triplet acceptor/emitter. The TTA UC is undisturbed by the open-form DTE but can be switched OFF upon photoirradiation of the mixture of the three components at 254 nm, i.e., by the closed-form DTE. Subsequent visible light irradiation restores the TTA UC. By studying the competitive triplet-state energy-transfer processes with nanosecond time-resolved transient difference absorption and fluorescence spectroscopy, we confirmed that the quenching of the perylene triplet excited state by closed-form DTE is dominant among the four possible quenching processes.