Abstract
0.1, 0.3, 0.5, 1.0, 5.0, and 10.0 % Sm3+-doped Y3Al5O12 single crystals were grown by the floating zone method. Photoluminescence (PL) and radioluminescence (RL) properties of the samples were evaluated and the emission peaks due to 4f-4f transitions of Sm3+ ions were observed. The PL quantum yield of the 0.3 % Sm3+-doped sample was highest among all the samples (approximately 48 %). PL and RL decay times of the samples were 0.7–2.7 and 0.6–2.9 ms, respectively. The light yield of the 0.5 % Sm3+-doped sample under γ-ray excitation was highest and its value was estimated to be approximately 8400 photons/MeV using a measurement system for scintillators with slow decay times.
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