Luminescent properties of Pr 3+ doped (Ca, Zn) TiO 3: Powders and films

Abstract

The structural and photoluminescent properties of the Pr 3+ doped Ca 1− x Zn x TiO 3 (CZT) powders and films were investigated. The Zn concentration affected strongly the red emission of the phosphors. The maximum fluorescence intensity was found to be at x = 30%, for both the powders and films. The phosphorescence of the red emission was also enhanced for powders and the largest afterglow happened at x = 10%, while the Zn doping had little effect on the afterglow behavior of the films. Charge compensation to the Pr 3+ ions using Ca deficiency further increased the fluorescence intensity, but suppressed the red afterglow of the CZT powders. It was demonstrated that the addition of Zn 2+ may make the energy transfer more effective from the perovskite host to the Pr 3+ ions, leading to the enhancement of both the fluorescence and phosphorescence. However, the phosphorescence was directly related to the amounts of uncompensated Pr 3+ ions in the powders.