Abstract

The photoluminescence and radioluminescence properties of Tb-doped Lu2O3 (Lu2O3:Tb) single crystals were assessed for scintillator applications. Lu2O3:Tb exhibits several sharp peaks at 490, 540, 590, and 620 nm attributed to Tb3+, and the decay curves show the typical decay time for Tb3+ in millisecond range. The decay decreases with increasing dopant concentration owing to concentration quenching. Energy distributions under 137Cs γ-rays demonstrate that the 0.1 % Tb-doped Lu2O3 exhibits the highest scintillation light yield (75,000 photons/MeV) among the samples.

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