Photoluminescence analysis of Czochralski-grown lanthanum aluminate single crystals

Kotaro Kanai, Eiji Hirata, Yoshimichi Ohki

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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 1

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Keywords

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

ASJC Scopus subject areas

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

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