[Preparation and characterization of long-afterglow nanophosphors CaTiO3 : Pr]

CaTiO3 : Pr nanophosphors were prepared with a gel-network precipitation technique using cheap inorganic precursors. The samples, being well dispersed and sphere-like with an average diameter of 100 nm, were observed with transmission electron microscope (TEM). The mechanism of coprecipitation and crystallization was discussed briefly based on TG-DTA and the X-ray diffractometer (XRD) results. The luminescent properties were investigated by the fluorescence spectrophotometer. The conditions of the preparation process were also studied systematically and the optimal conditions were concluded. The results show that the products with strongest luminescence intensity could be prepared at 1 100 degrees C for one hour, and the luminescent features of samples synthesized by the gel-network precipitation technique are similar to those by solid-state reaction, while the calcining temperature is reduced about 200 degrees C. In conclusion, uniform long-afterglow nanophosphors CaTiO3 : Pr were successfully synthesized with simple apparatus at low cost.