2021 Fiscal Year Final Research Report

Research on the co-doping effects of 4-6 group cations on scintillation properties in various Ce doped single crystal scintillators and their performance improvement mechanism

Research Project

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Project/Area Number	19K12626
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 80040:Quantum beam science-related
Research Institution	Tohoku University
Principal Investigator	KIM Kyoung Jin 東北大学, 金属材料研究所, 学術研究員 (10521768)
Co-Investigator(Kenkyū-buntansha)	鎌田圭東北大学, 未来科学技術共同研究センター, 准教授 (60639649)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	結晶成長 / Scintillator / Ce添加 / 共添加
Outline of Final Research Achievements	The effect of group 4-6 ions, such as Mo and W, co-doping on the scintillation properties of various scintillator crystals grown by the micro-pulling down (μ-PD) method was investigated for the first time. The optimal co-doping ion concentrations for the best scintillation properties were found. Crystals with optimized compositions were grown also as 1-inch boules by the Czochralski (CZ) technique. Chemical composition, optical properties, luminescence characteristics, and scintillation characteristics for the grown crystals were investigated. Such data gave the information for the fine composition and growth parameters adjustment. Additionally, the luminescence mechanism of the grown crystals was investigated and discussed together with Professor Nikl, an international collaborator. The deep understanding of such a mechanism enabled further improvement of the scintillation properties of co-doped crystals.
Free Research Field	結晶成長
Academic Significance and Societal Importance of the Research Achievements	・GAGGシンチレータに対する4~6族陽イオン共添加によるシンチレータ特性の変化とその発光メカニズムの解明に向けた基盤となる研究成果となり、シンチレータの発光現象に対する共添加元素の効果を明らかにすることができた。現在も世界規模で競争が繰り広げられている、新規高性能シンチレータ開発や既存シンチレータの性能改善につながる指針となる成果である。・発光メカニズムの解明は、世界的なシンチレータ研究の進展にも貢献し、学術上の意義は大きい。さらに、従来提唱されてきた特性改善メカニズム理論を覆す、新たな発光特性改善メカニズムを提唱できれば、学術的独自性と創造性が多大である。