Intense photostimulated luminescence (PSL) with a peak at 420 nm is observed in ultraviolet (UV) light-irradiated europium-doped potassium chloride (KCl : Eu) crystalline phosphors. The PSL characteristics of UV-irradiated KCl : Eu phosphor for optical memory application were studied. The excitation and emission mechanisms of the 420 nm PSL, which are consistent with the results obtained, are discussed.
