Aggregation-induced photon upconversion through control of the triplet energy landscapes of the solution and solid states

Pengfei Duan, Nobuhiro Yanai, Yuki Kurashige, Nobuo Kimizuka

    研究成果: Contribution to journalArticle査読

    57 被引用数 (Scopus)

    抄録

    Aggregation-induced photon upconversion (iPUC) based on control of the triplet energy landscape is demonstrated for the first time. When a triplet state of a cyano-substituted 1,4-distyrylbenzene derivative is sensitized in solution, no upconverted emission based on triplet-triplet annihilation (TTA) was observed. In stark contrast, crystalline solids obtained by drying the solution revealed clear upconverted emission. Theoretical studies unveiled an underlying switching mechanism: the excited triplets in solution immediately decay back to the ground state through conformational twisting around a C-C bond and photoisomerization, whereas this deactivation path is effectively inhibited in the solid state. The finding of iPUC phenomena highlights the importance of controlling excited energy landscapes in condensed molecular systems. Affairs of state: Whereas a cyano-substituted 1,4-distyrylbenzene derivative shows no upconverted (UC) emission in solution, a clear upconverted emission is observed for solution-cast crystals (see picture). The difference is attributed to immediate decay of excited triplets through conformational twisting and isomerization being possible in solution but not in the solid state.

    本文言語英語
    ページ(範囲)7544-7549
    ページ数6
    ジャーナルAngewandte Chemie - International Edition
    54
    26
    DOI
    出版ステータス出版済み - 6 1 2015

    All Science Journal Classification (ASJC) codes

    • 触媒
    • 化学 (全般)

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