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Research on Efficient Fast Scintillators: Evidence and X‐Ray Absorption Near Edge Spectroscopy Characterization of Ce 4+ in Ce 3+ , Mg 2+ ‐Co‐Doped Gd 3 Al 2 Ga 3 O 12 Garnet Crystal
Author(s) -
Dantelle Géraldine,
Boulon Georges,
Guyot Yannick,
Testemale Denis,
Guzik Malgorzata,
Kurosawa Shunsuke,
Kamada Kei,
Yoshikawa Akira
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900510
Subject(s) - xanes , materials science , doping , scintillator , analytical chemistry (journal) , spectroscopy , absorption edge , absorption (acoustics) , absorption spectroscopy , x ray absorption spectroscopy , x ray spectroscopy , nuclear chemistry , chemistry , optics , physics , band gap , optoelectronics , chromatography , quantum mechanics , detector , composite material
Herein, the most advanced oxide scintillator Ce 3+ , Mg 2+ ‐co‐doped Gd 3 Al 2 Ga 3 O 12 (GAGG) garnet host, grown using the Czochralski method is reported. The charge transfer absorption band in UV, such as in other Ce 3+ , Mg 2+ ‐co‐doped oxides, reveals the creation of stable Ce 4+ oxidation state, in addition to the usual Ce 3+ one, admitted as responsible of the scintillation mechanism improvement displayed by this garnet. Strangely, the confirmation of quantitative values of Ce 4+ concentration has never been done, and the goal is mainly focused on the presence of Ce 4+ and the evaluation of the Ce 3+ /Ce 4+ ratio measured by X‐ray absorption near edge spectroscopy (XANES) spectroscopy at the Ce L III threshold of the European Synchrotron Radiation Facility (ESRF). This result is compared with those obtained for Ce 3+ , Mg 2+ ‐co‐doped Lu 3 Al 5 O 12 (LuAG) and, also, in garnets without any Mg 2+ ions such as Ce 3+ ‐doped GAGG, Ce 3+ ‐doped LuAG, and Ce 3+ ‐doped YAG. The role of Li + ion in place of Mg 2+ one is also considered in Ce 3+ , Li + ‐co‐doped LuAG single crystal.