Abstract
The intrinsic luminescence center (LC) of SO 2−4 appears at 360 nm in all types of sulfates, but is absent in sulfates with large quantities of impurities. Three nonequivalent Gd3+ LC have been observed in luminescence spectra of anhydrite. Gd3+, Ce3+ O −2 LC were established in celestite.
Photoluminescence (PL) bands in the sulfates were assigned as follows: the band at 460 nm is related to Eu2+ (a connection with Al3+ or donor-acceptor pair is possible also) in sulfates of Ca and Ba; bands at 520 nm and 590 nm are related to VO4, MoO4 and TiO4 substituting SO4; the band at 660 nm is assigned to Ti3+ X-ray luminescence (XL) band at 620 nm is assigned to Ag+.
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Gaft, M.L., Bershov, L.V., Krasnaya, A.R. et al. Luminescence centers in anhydrite, barite, celestite and their synthesized analogs. Phys Chem Minerals 11, 255–260 (1985). https://doi.org/10.1007/BF00307403
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DOI: https://doi.org/10.1007/BF00307403