| Abstrakt: |
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 (Ω2, Ω4, Ω6) 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 (Ω2, Ω4 and Ω6), Ω2, that is related to structural adjustments in the area of the Ln3+ ion, indicates slow adjustments of the covalent surroundings. [ABSTRACT FROM AUTHOR] |
