Nano-sphere-like Eu3+ activated lanthanum oxysulfide phosphor was first synthesized directly by solvothermal method. The phosphor was characterized by XRD, TEM and PL. Photoluminescence spectra indicate that this phosphor showed three typical transitions of Eu3+(()5D0→()7F1, ()5D0→()7F2, (()5D0→()7F4).) In comparison with those prepared by high temperature solid state method, photoluminescence spectrum of Eu3+(()5D0→()7F2)-doped nano-La2O2S∶Eu3+ phosphor became broader. And the reaction mechanism was also mentioned in this paper.
Luminescence of Tb3+ doped MO (M=Ca,Sr) were investigated. Photoluminescence of MO:Tb3+ (M=Ca, Sr) is due to the 5D4,3-7FJ transitions of Tb3+ ions. Under UV light irradiation, the strongest luminescence peak of SrO:Tb3+ located at 543 nm while the CaO:Tb3+ located at 550 nm. Long-lasting phosphorescence of MO:Tb3+ (M= Ca,Sr) were also observed with naked eye even after the 254 nm UV irradiation have been removed. Thermolumi- nescence (TL) spectra revealed that the incorporation of the Tb3+ formed a highly dense trapping level located at a suitable depth in relation to the thermal release rate at RT to creat the long-lasting phosphorescence.