Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 26, Pages 9256-9259Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja504211y
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Funding
- NSFC [21273028]
- Royal Society (UK)-NSFC [21011130154]
- Ministry of Education [SRFDP-20120041130005, IRT_13R06, DUT14ZD226]
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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.
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