Photostimulated red long-lasting phosphorescence in beta-Zn-3(PO4)(2) :Mn2+, Ga3+ was observed and investigated by fluorescence, phosphorescence, and thermoluminescence spectra. The present sample emits intense red long-lasting phosphorescence after irradiation by 254 nm UV light. The red long-lasting phosphorescence appears once again after further excitation by 365 nm UV light when the sample is kept in the dark for 24 h, and the 254 nm UV light-induced long-lasting phosphorescence cannot be detected. A mechanism responsible for the photostimulated long-lasting phosphorescence is proposed. (C) 2004 The Electrochemical Society.