[OPTICAL REVIEW Vol. 1, No. 2 (1994) 177-179]

Eu-Doped KCl Storage Phosphor for Erasable and Rewritable Optical Memory Utilizing Photostimulated Luminescence Phenomenon

Hidehito NANTO,1 Fumitaka ENDO,1 Yoshiaki HIRAI,1 Shouichi NASU2 and Nozomu TAKEUCHI3

1Electron Device System Research Laboratory, 2Department of Electrical Engineering, Kanazawa Institute of Technology, 7-1, Oogigaoka, Nonoichi-machi, P.O. Kanazawa-South, 921 Japan, 3Faculty of Technology, Kanazawa University, 20, Kodatsuno, Kanazawa, Ishikawa, 920 Japan

(Accepted September 6, 1994)

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.

Key words : optical memory, photostimulated luminescence, KCl : Eu