Laser‐stimulable transparent KCl:Eu crystals for erasable and rewritable optical memory utilizing photostimulated luminescence

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