Front-line polymer science: Molecular self-assembly and photon upconversion

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    Photon upconversion (UC) is the key technology to overcome the thermodynamic efficiency limits in solar energy conversion devices. Triplet-triplet annihilation (TTA)-based UC has drawn increasing attention in recent years, primarily because of its occurrence with lowintensity, noncoherent light as the excitation source. To date, efficient TTA-UC has been achieved in solution because diffusion of triplet molecules is essential for energy transfer processes. However, the use of volatile organic solvents and deactivation of triplet states by molecular oxygen significantly disturb their practical applications. Although recently the TTA-based UC has been investigated in solid polymer films, the slow molecular diffusion limits the efficiency of TTA-UC. To solve these problems, we are proposing a paradigm shift from molecular diffusion to energy migration. Assemblies of donor and acceptor display a sequence of efficient donor-to-acceptor triplet-triplet energy transfer (TTET), triplet energy migration, and TTA in the self-assembled state.

    Original languageEnglish
    Pages (from-to)439-443
    Number of pages5
    Issue number7
    Publication statusPublished - Jul 1 2015

    All Science Journal Classification (ASJC) codes

    • General Chemical Engineering


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