Structure and Luminescent Properties of Glasses in the GeS 2 -Ga 2 S 3 -Sb 2 S 3 :Pr 3+ System.

The physicochemical, optical, and luminescent properties and structures of glasses of the Ga 2 S 3 -GeS 2 -Sb 2 S 3 :Pr system have been studied in a wide range of concentrations of the main components in order to reveal their correlation with the composition. According to the calculations using the Judd-Ofelt theory, glasses with a high content of Sb 2 S 3 should provide the highest luminescence efficiency of Pr 3+ ions. However, this result is leveled by enhancing the concentration quenching effect, followed by an increase of the Sb 2 S 3 content in the glasses. The introduction of Pr leads to a significant increase in the fraction of Sb-Sb, Sb-Ge, Ge-Ge bonds in glasses enriched with Sb 2 S 3 and GeS 2 . In the cases of the glasses enriched with Ga 2 S 3 , this effect was not observed, apparently because Ga promotes the formation of three-coordinated sulfur atoms.