Optical and scintillation characteristics of Lu2Y(Al5-xGax)O12:Ce,Mg multicomponent garnet crystals

Journal article

Authors/Editors

Strategic Research Themes

Smart Healthcare (Strategic Research Themes)

Publication Details

Author list: Warut Chewpraditkul, Nakarin Pattanaboonmee, Weerapong Chewpraditkul, Kei Kamada, Kyoung Jin Kim, Akira Yoshikawa, Michał Makowski, Marcin E. Witkowski, Winicjusz Drozdowski, Alena Beitlerova, Romana Kucerkova, Vladimir Babin, Martin Nikl

Publisher: Elsevier

Publication year: 2022

Volume number: 134

Issue number: Part A

Start page: 113186

End page: 113186

Number of pages: 1

ISSN: 0925-3467

eISSN: 1873-1252

URL: https://www.sciencedirect.com/science/article/abs/pii/S092534672201223X

Languages: English-United States (EN-US)

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Abstract

Optical and scintillation characteristics of Mg2+-codoped Lu2Y(Al5-xGax)O12:Ce (x = 2, 3) multicomponent garnet crystals grown by the micro-pulling down method were investigated. At RT, the shortening of scintillation decay time and a decrease of light yield (LY) value measured for a higher Ga containing samples can be explained by thermal ionization of the Ce3+ 5d1 excited state. At 662 keV γ-rays, Lu2YAl3Ga2O12: Ce, 0.05%Mg exhibits high LY value of 29,000 ph/MeV along with scintillation decay times of 50 ns (86%) + 73 ns (14%). Co-doping with larger Mg2+ content leads to a decrease of LY value, scintillation decay time, and afterglow level. Radioluminescence quenching observed at low temperature region in correlation with large thermoluminescence peaks can be caused by trapping of electrons at intrinsic shallow traps.

Keywords

Scintillator