Electronic excitation and relaxation processes of oxygen vacancies in YSZ and their involvement in photoluminescence

Takaaki Morimoto, Yasuhiro Kuroda, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Yttria-stabilized zirconia (YSZ) consists of zirconia and yttria and oxygen vacancies appear in accordance with the ratio of yttria. The oxygen vacancy would sometimes give annoyance, but it would be beneficial on other occasions, depending on its applications. Photoluminescence (PL) due to oxygen vacancies induced by photons with energies around 5.5 eV exhibits two decay time constants. As a possible reason for this, an oxygen vacancy changes its charging state from neutral to positive monovalent by losing an electron when YSZ is irradiated by ultraviolet photons. The PL decays either in a ms range or in a ns range, depending on whether the oxygen vacancies are neutral or positive monovalent.

    Original languageEnglish
    Article number790
    JournalApplied Physics A: Materials Science and Processing
    Volume122
    Issue number9
    DOIs
    Publication statusPublished - 2016 Sep 1

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)

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