Abstract
The mixed-compound of Sr 1− x Ca x TiO 3 has shown several compositional phase transformations. Photoluminescence and excitation spectra of the samples with different x and doped with 0.2% Pr 3+ were investigated. Changes in the emission spectra were observed in different phases. The blue emission at 491 nm from 3P 0 state was found quite strong in the tetragonal phase, and was thermally quenched in the orthorhombic phases. The intensity of the red luminescence from 1D 2 increases with increasing content of calcium. The strongest red emission is obtained from CaTiO 3:Pr 3+. The results are discussed based on the configuration coordinate model and interaction of Pr with the charge transfer exciton state of the Ti complex.
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