Up-Conversion Photostimulated Luminescence of Mg₂SnO₄ for Optical Storage

We report the first observation of up-conversion photostimulated luminescence in non-doped Mg₂SnO₄. Stimulated by 980 nm infrared laser (reading) after ultraviolet irradiation (writing), the phosphor shows photostimulated emission band covering 470–550 nm, which is due to the recombination of F centers with holes. After ceasing ultraviolet irradiation, the storage intensity would rapidly decrease to 59% of its original storage intensity in 2.5 h and then would not degrade anymore. It is suggested that the Mg₂SnO₄ has potential applications for optical storage. Accordingly, the possible photostimulated luminescence mechanisms of Mg₂SnO₄ are proposed.