Abstract
Absorption, emission and excitation spectra of CaF 2, SrF 2, BaF 2 crystals doped by Y bF 3 or EuF 3 impurities were studied in 1–12 eV spectral region. The intensive absorption broad bands (denoted as CT 1) were observed in all cases just below the 4f–5d absorption region. Less intensive absorption bands, denoted as CT 2, having energies 1.2–1.5 eV lower than those of CT 1, were observed in CaF 2, SrF 2 crystals doped by EuF 3 or Y bF 3 impurities. High resolution emission spectra of Eu-doped CaF 2 and SrF 2 crystals excited into CT 1 and CT 2 bands were measured. Under excitation into CT 1 bands, all present Eu sites (C 4v, O h and some aggregates) were observed in emission spectra. While under excitation into CT 2 bands, only the emission of C 4v sites was observed.
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