Imaging Science and Photochemistry ›› 2017, Vol. 35 ›› Issue (3): 211-232.DOI: 10.7517/j.issn.1674-0475.2017.03.211

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Controlling and Application of the Triplet Excited State of Organic Chromphores

WANG Zhijia1, CHEN Kepeng1, LIU Ya2,3, ZHAO Jianzhang1, ZAFAR Mahmood1, JI Wei4, HAN Keli2   

  1. 1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China;
    2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, P. R. China;
    3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    4. College of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China
  • Received:2017-02-17 Revised:2017-04-14 Online:2017-05-15 Published:2017-05-15

Abstract:

The recent development of controlling of the triplet excited state of organic chromophores was summarized. Controlling the triplet excited state is very useful, by which various functional organic compounds can be developed. For instance, the activatable PDT photosensitizers, phosphorescent molecular probes, and can be applied in photoswitchable triplet-triplet annihilation (TTA) upconversion. However, by comparison to the controlling of singlet excited state (fluorescence), the study on the controlling of the triplet excited state is rare. Recently there are some reports on triplet state switching by supramolecular or covalent modification methods, based on photophysical processes such as Förster resonance energy transfer (FRET), triplet triplet energy transfer (TTET), photo-induced electron transfer (PET), etc. These reports show that controlling of the triplet excited state is very different from controlling of the singlet excited state. For example, usually the singlet excited state can be quenched by PET effect, but the triplet excited state can not be quenched by PET effect in many cases. This review article summarizes the development of triplet state switching, and will be useful for the molecular design concerning the controlling and application of triplet excited state in functional organic compounds.

Key words: photochemistry, triplet state, transient spectra, energy transfer, electron transfer, upconversion