Abstract
The paper reports on a study of luminescence and excitation spectra of SrAlF5:Pr3+ (0.5 mol %) polycrystals performed at 10 and 300 K with synchrotron radiation in the range from 5 to 25 eV. The Pr3+ ions in SrAlF5 were shown to emit successively two photons in transitions from the 1 S 0 and 3 P 0 levels. The main energy characteristics of the compound, namely, the position of the 4f → 5d excitation band (5.95–8.0 eV), the energy separation between the 1 S 0, 4f and the lowest 5d levels (∼0.15 eV), and the SrAlF5 band gap width (∼12 eV), were determined. SrAlF5:Pr3+ was found to possess a number of features not found in other Pr3+-activated fluorides.
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