Photostimulated luminescence (PSL) in Eu and Sm codoped strontium sulfide (SrS:Eu, Sm) phosphor ceramics is studied in order to develop a novel erasable and rewritable optical memory utilizing the PSL. Intense PSL with a peak at about 600 nm is observed in SrS:Eu, Sm phosphor ceramics which are stimulated with infrared light after irradiation with ultraviolet (UV) light or visible light. The excitation and emission mechanisms of the 600 nm PSL are discussed. The PSL characteristics for the optical memory are reported.
SummaryIntense photostimulated luminescence (PSL) is observed, for the first time, in X-ray-irradiated KClxBr1-x:Eu phosphor ceramics. The peak in the stimulation spectrum for PSL red-shifts with increasing the Br content of KClxBr1-x:Eu phosphor. The intensity of PSL with a peak at about 420 nm increases linearly with increasing X-ray dose over the wide range. The KBr:Eu phosphor exhibits excellent fading characteristics at room temperature. These results strongly suggest that KClxBr1-x:Eu phosphor, especially KBr:Eu phosphor is useful as a material for two-dimensional image sensor for ionizing radiation.
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