Study of the Photoluminescence Properties of Crystal Phosphors SrTiO 3 :Pr 3+ and SrTiO 3 :Pr 3+ , Al

Fine-grained powder crystal phosphors SrTiO3:Pr3+ and SrTiO3:Pr3+, Al have been investigated. Their photoexcitation, luminescence, and photoconductivity spectra have been recorded. It is found that only one center (PrSr·) is responsible for the luminescence in SrTiO3:Pr3+, while the luminescence in SrTiO3:Pr3+, Al is due to two centers: (AlTi′ PrSr·)× and PrSr·. A mechanism of energy transfer upon luminescence excitation from the (AlTi′ PrSr·)× center is proposed.