Abstract
Photoluminescence properties of (Sr1-xCax)0.997Pr0.002TiO3 were investigated by excitation, emmition, and diffuse reflectance spectra in the range 300-800 nm at room temperature. The excitation spectra monitored at 613 nm and the diffuse reflectance spectra showed a two-step character due to valence-to-conduction band absorption and f2-fd absorption of Pr3+ ions. The valence-to-conduction band absorption and f2-fd absorption edges shifted to the high and the low wavelength side, respectively, as decreasing x. The mechanism of the emission of red light and the x dependence of intensity were discussed based on these results.
