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Preparation and scintillation properties of translucent LiCaBO3:Ce polycrystalline plates

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Title: Preparation and scintillation properties of translucent LiCaBO3:Ce polycrystalline plates
Authors: Toyoda, Saki Browse this author
Higuchi, Mikio Browse this author →KAKEN DB
Tsubota, Youichi Browse this author
Kaneko, Junichi H. Browse this author
Tadanaga, Kiyoharu Browse this author
Keywords: Neutron scintillator
Translucent polycrystalline thin plate
Liquid phase sintering
Grain growth
Issue Date: Aug-2017
Publisher: Elsevier
Journal Title: Optical Materials
Volume: 70
Start Page: 180
End Page: 183
Publisher DOI: 10.1016/j.optmat.2017.05.023
Abstract: Translucent LiCaBO3:Ce thin plates were prepared by liquid phase sintering using LiBO2 as a sintering aid, and their fluorescent and scintillation properties were investigated to examine the possibility to use as neutron scintillator. Since the initial part of the directionally solidified specimen contained a second phase of Ca3B2O6, LiCaBO3 may melt incongruently, and simple melt growth of LiCaBO3:Ce is consequently difficult. Translucent thin plates 300 mu m in thickness were successfully fabricated from LiCaBO3:Ce sintered compacts. Although strong fluorescence with the peak wavelength of 390 nm was observed in photoluminescence measurement, scintillation light yield and detection efficiency by alpha-particle irradiation were rather poor. The diffuse reflectance spectrum of LiCaBO3:Ce revealed existence of an absorption band other than Ce3+ bands in the ultraviolet region. The band may corresponds to defect levels, which interrupt the energy transfer from the conduction band of the host to the 5d level of Ce3+ resulting in the degradation of the scintillation performance. (C) 2017 Elsevier B.V. All rights reserved.
Rights: © 2017. This manuscript version is made available under theCC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 樋口 幹雄

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