Information from the abstract
Undoped and Ce-doped Lu0.5Gd0.5AlO3 (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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Related topics: Radiation Detection and Scintillator Technologies · Luminescence Properties of Advanced Materials · Nuclear materials and radiation effects
Thai researcher and institutional participation
Tharittawat Tharasook · Prom Kantuptim · Kasetsart University
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