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

摘要

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 was at 613nm, due to the transition of 1D2-3H4. 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.