By heat treating the alkaline earth fluorosilicate glass, transparent glass ceramics containing alkaline earth fluoride nanocrystallites were prepared. The luminescence spectra and phonon sideband associated with the Eu3+:5D2→7F0 in glass and glass ceramics were investi-gated to analyze the local environment around Eu3+. Judd-Ofelt parameters were also calculated from emission spectra, which indicated that the Eu3+ ions entered the precipitated CaF2, SrF2, and BaF2 nanocrystallites. Heat treating could not pledge Eu3+ ions to coordinate with F in the precipitated MgF2 nanocrystallites, owing to the smaller radius of Mg2+ than that of Eu3+.
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