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The optical excitation and luminescence spectra of (Pr 3+ ,Ce 3+ ) ions in KCaF 3 are presented. High-resolution excitation and emission spectra of Pr 3+ and Ce 3+ were measured at temperatures between 77 and 293K. First measurements of KCaF 3 :Ce 3+ crystal show that there are nonequivalent Ce 3+ centers...
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