Impact of Eu3+/Tb3+ ions on PbO–NaF–B2O3 glasses optical absorption spectra

Abstract

The optical characteristics of glasses have become an increasingly established and developing aspect. This article presents the optical characteristics of the Ln3+ ion in lead sodium fluoroborate glass, which has the composition 10 PbO–19 NaF–70 B2O3–1.0 Ln2O3 (where Ln=Eu and Tb, all in mol.%). Glass samples were processed using the conventional melt-quenched approach, and the glassy nature was confirmed by the X-ray diffraction patterns. The optical absorption spectra of PbO–NaF–B2O3 glasses with Eu3+ ions exhibit distinct absorption bands that were assigned to the transitions 7F05L6, 5D3, 5D2, and 7F15D1. Judd-Ofelt (JO) factors (2, 4, 6) were determined from the absorption spectra. By using least square fit analysis, oscillator strength (f) was evaluated and presented. Regarding the three J-O parameters (2, 4 and 6), 2, that is related to structural adjustments in the area of the Ln3+ ion, indicates slow adjustments of the covalent surroundings.