Structural, optical and thermal investigations on Dy3+ doped NaF–Li2O–B2O3 glasses

Abstract

Abstract Structural, optical and thermal properties of Dy 3+ doped lithium fluoroborate glasses have been studied for various concentrations of Dy 3+ from 0.5 to 5 wt%. The XRD studies confirm the amorphous nature of the glasses while the FTIR spectra reveal the presence of BO 3 and BO 4 local structural units. The UV–VIS–NIR absorption studies were carried out to calculate the bonding parameters ( β ¯ and δ ), to identify the ionic/covalent nature of the glasses. The JO parameters, experimental and theoretical oscillator strengths were also determined and reported. The luminescence spectra have been studied to determine the radiative transition probability ( A ), stimulated emission cross section ( σ P E ) and the experimental and calculated branching ratios ( β R ) for the excited levels that include 4 F 9/2 → 6 H 11/2 , 6 H 13/2 , and 6 H 15/2 transitions. The variation of optical properties with varying concentrations of dysprosium oxide content in the glasses are reported and discussed. The thermal behavior of Dy 3+ doped lithium fluoroborate glasses have been reported by recording DSC thermograms.