Abstract
Intense photostimulated luminescence (PSL) with a peak at about 650 nm is observed in europium and samarium co-doped calcium sulfide (CaS: Eu,Sm) phosphor ceramics by excitation with ionizing radiation such as X-rays and UV-rays. The PSL intensity is increased by increasing the X-ray or UV-ray dose, indicating that CaS: Eu,Sm phosphor is a useful material for two-dimensional X-ray or UV-ray imaging sensor utilizing PSL. The results obtained are consistent with the proposed emission mechanism of the 650 nm PSL, based on the recombination of electrons released from Sm 2+ ions as electron traps with Eu 3+ ions.
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