Repozytorium

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.

Autorzy

Géraldine Dantelle

Georges Boulon

Yannick Guyot

Denis Testemale

Małgorzata Guzik

Shunsuke Kurosawa

Kei Kamada

Akira Yoshikawa

Rok wydania

2020

Czasopismo

Physica Status Solidi B-Basic Solid State Physics

Numer woluminu

257

Strony

1900510/1-1900510/7

DOI

10.1002/pssb.201900510

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

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.

Słowa kluczowe

Ce3+ and Ce4+ dopants, fast scintillator, garnet crystals, Optical spectroscopy, X-ray absorption near edge spectroscopy

Adres publiczny

http://dx.doi.org/10.1002/pssb.201900510

Strona internetowa wydawcy

onlinelibrary.wiley.com/

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