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Investigation of Optical Properties of Ceramic Ce:GAGG by High Temperature Annealing
박찬선,Muhammad Nasir Ullah,김찬호,Shinhaeng Cho,염정열 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.12
An as-fabricated cerium-doped ceramic scintillator Gd$_3$Al$_2$Ga$_3$O$_{12}$ (Ce:GAGG) was thermally annealed at different temperatures. The light output and energy resolution of the scintillators were measured before and after thermal treatment. The effect of thermal annealing in the air at high temperature (at 1000 $^\circ$C for 5 hours) deforms the microstructure by mitigating oxygen vacancies of the ceramic scintillator. This has been proven by XPS study that showed the existence of oxygen vacancies and subsequent decrease of oxygen deficiency amid annealing treatment that led to an output signal increase. The diffusion ability of oxygen atoms by annealing played a key role in compensating for defect sites. In this study, by controlling thermodynamic conditions, the light output was enhanced by $\sim$30.4\% and the energy resolution improved by $\sim$2.4\% after annealing at 1000 $^\circ$C in the air.