Influence of glass formers and glass modifiers on spectral properties and CIE coordinates of Dy ions in lead-free borate glasses.

Spectral properties of lead-free glasses doped with Dy ions in function of glass formers and glass modifiers were studied. The glass systems in a function of concentration GeO and CaO/SrO/BaO which was partially or totally replaced by CaF/SrF/BaF were synthesized. The visible luminescence spectra for obtained glasses were registered and value of parameters such as ratio of yellow-to-blue luminescence and the Commission Internationale de I'Eclairage (CIE) chromaticity coordinates (x, y) were analyzed in detail. The Y/B increase from 2.97 to 3.8 in systems with increasing of concentration glass former (GeO), whereas ratio Y/B slightly decreases when the of content fluoride glass modifiers increases. The obtained results confirm that impact on visible luminescence of lead-free borate glasses doped with Dy ions is greater for glass former than glass modifier. Moreover, studied systems can be used for optoelectronic as yellowish emitters.