Direct imaging of light emission centers in two-dimensional crystals and their luminescence and photocatalytic properties

Shintaro Ida, Shota Koga, Takeshi Daio, Hidehisa Hagiwara, Tatsumi Ishihara

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    To fully understand the fundamental properties of light-energy-converting materials, it is important to determine the local atomic configuration of photofunctional centers. In this study, direct imaging of one- and two-Tb-atom emission centers in a two-dimensional Tb-doped Ca2Ta3O10 nanocrystal was carried. The emission centers were located at the Ca sites in the perovskite structure, and no concentration-based quenching was observed even when the emission centers were in close proximity to each other. The relative photoluminescence efficiency for green emission of the nanosheet suspension was 38.1%. Furthermore, the Tb-doped Ca2Ta3O10 nanocrystal deposited co-catalyst showed high photocatalytic activity for hydrogen production from water (quantum efficiency: 71% at 270 nm). Tb3+ dopants in the two-dimensional crystal might have the potential to stabilize the charge separation state.

    Original languageEnglish
    Pages (from-to)13078-13082
    Number of pages5
    JournalAngewandte Chemie - International Edition
    Volume53
    Issue number48
    DOIs
    Publication statusPublished - Nov 24 2014

    All Science Journal Classification (ASJC) codes

    • Catalysis
    • Chemistry(all)

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