Photon-Upconverting Ionic Liquids: Effective Triplet Energy Migration in Contiguous Ionic Chromophore Arrays

Shota Hisamitsu, Nobuhiro Yanai, Nobuo Kimizuka

    Research output: Contribution to journalArticlepeer-review

    65 Citations (Scopus)

    Abstract

    Inspired by the bicontinuous ionic-network structure of ionic liquids (ILs), we developed a new family of photofunctional ILs which show efficient triplet energy migration among contiguously arrayed ionic chromophores. A novel fluorescent IL, comprising an aromatic 9,10-diphenylanthracene 2-sulfonate anion and an alkylated phosphonium cation, showed pronounced interactions between chromophores, as revealed by its spectral properties. Upon dissolving a triplet sensitizer, the IL demonstrated photon upconversion based on triplet-triplet annihilation (TTA-UC). Interestingly, the TTA-UC process in the chromophoric IL was optimized at a much lower excitation intensity compared to the previous nonionic liquid TTA-UC system. The superior TTA-UC in this IL system is characterized by a relatively high triplet diffusion constant (1.63×10-6 cm2 s-1) which is ascribed to the presence of ionic chromophore networks in the IL.

    Original languageEnglish
    Pages (from-to)11550-11554
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Volume54
    Issue number39
    DOIs
    Publication statusPublished - Sep 1 2015

    All Science Journal Classification (ASJC) codes

    • Catalysis
    • Chemistry(all)

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