PHOTOLUMINESCENCE AND SCINTILLATION PROPERTIES OF CE-DOPED Lu0.5Gd0.5AlO3 SINGLE CRYSTALS GROWTH BY FLOATING ZONE METHOD

Tharittawat Tharasook; Keiichiro Miyazaki; Kensei Ichiba; Airo Fujii; Prom Kantubtim; Takumi Kato; Daisuke Nakauchi; Noriaki Kawaguchi; Takayuki Yanagida

doi:10.55766/sujst13751

Authors

Tharittawat Tharasook Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Road, Lat Yao, Chatuchak, Bangkok 10900, Thailand https://orcid.org/0009-0001-5994-9531
Keiichiro Miyazaki Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan https://orcid.org/0000-0001-8718-2967
Kensei Ichiba Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan https://orcid.org/0000-0001-6887-5952
Airo Fujii Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan https://orcid.org/0009-0005-5583-2124
Prom Kantubtim Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Road, Lat Yao, Chatuchak, Bangkok 10900, Thailand https://orcid.org/0000-0002-2509-1530
Takumi Kato Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan https://orcid.org/0000-0002-5650-4449
Daisuke Nakauchi Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan https://orcid.org/0000-0001-6686-4694
Noriaki Kawaguchi Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan https://orcid.org/0000-0002-6835-9437
Takayuki Yanagida Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan https://orcid.org/0000-0002-7326-5849

DOI:

https://doi.org/10.55766/sujst13751

Keywords:

Scintillator, Ce3+, Perovskite, Floating-zone, Radiation detection

Abstract

Undoped and Ce-doped Lu_0.5Gd_0.5AlO₃ (LuGdAP:Ce) single crystals were grown by the floating zone method. The coloration of the samples faded by annealing under a reducing atmosphere, and the characterizations of the samples after annealing were evaluated. The characterizations included X-ray diffraction, photoluminescence (PL), and scintillation properties. In PL properties, the 0.3% Ce-doped sample exhibited a broad emission at 350–500 nm under 290 nm excitation, and the emission would be ascribed to 5d-4f transitions of Ce³⁺ ions. The undoped sample showed emission at 650-750 nm under excitation at 320 nm, and the emission would be due to charged oxygen vacancies. In scintillation properties, all the Ce-doped samples showed a broad emission at 360-500 nm, which came from 5d-4f transitions of Ce³⁺ ions. According to pulse height spectra under γ-ray irradiation from ¹³⁷Cs, the scintillation light yield (LY) of the 0.3% Ce-doped was 1,610 ph/MeV, and the energy resolution was 54.4%. The 0.3% Ce-doped samples showed the lowest afterglow level at 20 ms after X-ray irradiation for 2 ms among all the Ce-doped samples. Therefore, the optimal Ce-concentration was 0.3% in terms of the LY and afterglow.

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PHOTOLUMINESCENCE AND SCINTILLATION PROPERTIES OF CE-DOPED Lu0.5Gd0.5AlO3 SINGLE CRYSTALS GROWTH BY FLOATING ZONE METHOD

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