Photoluminescence analysis of Czochralski-grown lanthanum aluminate single crystals

Kotaro Kanai, Eiji Hirata, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Photoluminescence (PL) spectra induced by ultraviolet photons were measured for Czochralski-grown lanthanum aluminate single crystals. Five PL peaks were observed at approximately 1.60, 1.64, 1.675, 2.0, and 2.8 eV at 10K, and the 2.8 eV PL disappears at 300 K. From PL excitation and vacuum ultraviolet absorption measurements, it is found that the 2.8 eV PL arises owing to the excitation of electrons to localized states in the band gap, and that PLs at approximately 1.60, 1.64, and 1.675 eV arise owing to the excitation of electrons to the conduction band. The 2.0 eV PL with a decay profile similar to that of the 2.8 eV PL is assumed to be caused by a process similar to that in the case of the 2.8 eV PL.

    Original languageEnglish
    Pages (from-to)7980-7982
    Number of pages3
    JournalJapanese Journal of Applied Physics
    Volume47
    Issue number10 PART 1
    DOIs
    Publication statusPublished - 2008 Oct

    Fingerprint

    Lanthanum
    lanthanum
    Photoluminescence
    Single crystals
    photoluminescence
    single crystals
    excitation
    Electrons
    ultraviolet absorption
    Conduction bands
    conduction bands
    Energy gap
    electrons
    Photons
    Vacuum
    vacuum
    photons
    decay
    profiles

    Keywords

    • Defect
    • High permittivity
    • High-k gate dielectric
    • Lanthanum aluminate
    • Photoluminescence
    • Single crystal

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

    Cite this

    Photoluminescence analysis of Czochralski-grown lanthanum aluminate single crystals. / Kanai, Kotaro; Hirata, Eiji; Ohki, Yoshimichi.

    In: Japanese Journal of Applied Physics, Vol. 47, No. 10 PART 1, 10.2008, p. 7980-7982.

    Research output: Contribution to journalArticle

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    abstract = "Photoluminescence (PL) spectra induced by ultraviolet photons were measured for Czochralski-grown lanthanum aluminate single crystals. Five PL peaks were observed at approximately 1.60, 1.64, 1.675, 2.0, and 2.8 eV at 10K, and the 2.8 eV PL disappears at 300 K. From PL excitation and vacuum ultraviolet absorption measurements, it is found that the 2.8 eV PL arises owing to the excitation of electrons to localized states in the band gap, and that PLs at approximately 1.60, 1.64, and 1.675 eV arise owing to the excitation of electrons to the conduction band. The 2.0 eV PL with a decay profile similar to that of the 2.8 eV PL is assumed to be caused by a process similar to that in the case of the 2.8 eV PL.",
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