Research on Efficient Fast Scintillators: Evidence and X-Ray Absorption Near Edge Spectroscopy Characterization of Ce4+ in Ce3+, Mg2+-Co-Doped Gd3Al2Ga3O12 Garnet Crystal

Géraldine Dantelle, Georges Boulon, Yannick Guyot, Denis Testemale, Malgorzata Guzik, Shunsuke Kurosawa, Kei Kamada, Akira Yoshikawa

Research output: Contribution to journalArticle

Abstract

Herein, the most advanced oxide scintillator Ce3+, Mg2+-co-doped Gd3Al2Ga3O12 (GAGG) garnet host, grown using the Czochralski method is reported. The charge transfer absorption band in UV, such as in other Ce3+, Mg2+-co-doped oxides, reveals the creation of stable Ce4+ oxidation state, in addition to the usual Ce3+ one, admitted as responsible of the scintillation mechanism improvement displayed by this garnet. Strangely, the confirmation of quantitative values of Ce4+ concentration has never been done, and the goal is mainly focused on the presence of Ce4+ and the evaluation of the Ce3+/Ce4+ ratio measured by X-ray absorption near edge spectroscopy (XANES) spectroscopy at the Ce LIII threshold of the European Synchrotron Radiation Facility (ESRF). This result is compared with those obtained for Ce3+, Mg2+-co-doped Lu3Al5O12 (LuAG) and, also, in garnets without any Mg2+ ions such as Ce3+-doped GAGG, Ce3+-doped LuAG, and Ce3+-doped YAG. The role of Li+ ion in place of Mg2+ one is also considered in Ce3+, Li+-co-doped LuAG single crystal.

Original languageEnglish
Article number1900510
JournalPhysica Status Solidi (B) Basic Research
Volume257
Issue number8
DOIs
Publication statusPublished - 2020 Aug 1

Keywords

  • Ce and Ce dopants
  • X-ray absorption near edge spectroscopy
  • fast scintillator
  • garnet crystals
  • optical spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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