The study on the fabrication of long lasting afterglow CaTiO3: Pr3+ by wet-dry method

The red long afterglow phosphor CaTiO3 activated with Pr3+ was formed by wet-dry method in this study. The luminescent properties of this sample had been studied systematically. The X-ray diffraction (XRD) patterns of the powder reveal that CaTiO3:Pr phase was obtained by wet-dry process. The afterglow decay curves were measured and the afterglow time was over 40 minutes. The excitation spectra and emission spectra were measured. The emission peak 3 was at 613nm, due to the transition of (D2H4)-D-1 With the function of weak crystal field the main emission divided into 612nm and 614nm. In spite of the main emission peak, phosphor had a shoulder emission peak at 620-628nm. Changes of Pr3+ molar ratio had little effect on the emission spectra, but with Pr3+ 0.2%, phosphor had an emission peak at 626nm. The excitation peak was at 342nm, with a shoulder peak at 400nm. Compared with SS, this less time and less energy was used and the same result is obtained.