Triplet energy migration-based photon upconversion by amphiphilic molecular assemblies in aerated water

Hironori Kouno, Taku Ogawa, Shogo Amemori, Prasenjit Mahato, Nobuhiro Yanai, Nobuo Kimizuka

    Research output: Contribution to journalArticlepeer-review

    46 Citations (Scopus)

    Abstract

    A molecular self-assembly approach is developed to resolve an outstanding issue in triplet energy migration-based photon upconversion (TEM-UC), that is, air-stable TEM-UC in water. Amphiphilic cationic acceptor (emitter) molecules self-assemble in water via hydrophobic and hydrogen bonding interactions, with which anionic donor (sensitizer) molecules are integrated through electrostatic interactions. Triplet energy is quantitatively transferred from the excited donor to the acceptor, which is followed by effective triplet energy migration among the pre-organized acceptors. It leads to TTA and concomitant UC emission in water. The dense acceptor chromophore arrays with extended hydrogen bonding networks show efficient barrier properties against molecular oxygen, as demonstrated by the stable UC emission even in air-saturated water.

    Original languageEnglish
    Pages (from-to)5224-5229
    Number of pages6
    JournalChemical Science
    Volume7
    Issue number8
    DOIs
    Publication statusPublished - 2016

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)

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