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论文类型：期刊论文

发表时间：2014-07-02

发表刊物：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：136

期号：26

页面范围：9256-9259

ISSN号：0002-7863

摘要：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.