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Absorption, emission, excitation spectra of CaF2, SrF2, BaF2 crystals doped by PrF3 in concentration ranging from 0.005% to few molar % were studied in 1.4–10eV spectral region. Specific type of Pr centres possessing photon cascade emission (PCE active) was observed in all crystals. Concentration of centres monitored by excitation and emission spectra grows superlinearly with increasing of Pr concentration...
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