The luminescence, reflection, and luminescence excitation spectra of two component Ca 1 ⎯ x Sr x F 2 :Ce 3+ (0.05 mol %) (x = 0.14, 0.25, 0.4, 0.6, and 0.75) have been studied at room temperature and T = 8 K. It is shown that the luminescence bands (upon 130 eV photon excitation) in the range of 200 to 400 nm are attributed to singlet and triplet self trapped exciton luminescence and to 5d-4f transitions in Ce 3+ .
The spectral properties of two-component Ca 1-x Sr x F 2 :Ce 3+ (0.05 mol%) (x = 0.75, 0.41, 0.25, 0.14) crystals in UV spectral region were investigated. It was shown that spectral properties of Ca 1-x Sr x F 2 :Ce 3+ (0.05 mol%) in UV spectral region have intermediate position between those for pure CaF 2 and SrF 2 crystals. The optical constants were calculated from reflectance spectrum for CaF 2 , SrF 2 , Ca 1-x Sr x F 2 :Ce 3+ (0.05 mol%) (x = 0.75, 0.25) crystals by use of Kramers-Kronig relations for complex reflection coefficient and Fresnel formulas.
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