Structural and optical investigations on Dy 3+ doped boro-tellurite glasses

Abstract

Dy 3+ doped boro-tellurite glasses were prepared by following melt quenching technique with the chemical composition (69 − x)H 3BO 3 + xTeO 2 + 15Mg 2CO 3 + 15K 2CO 3 + 1Dy 2O 3 (where x = 0, 10, 20, 30 and 40 wt%) by varying the tellurium dioxide content. The structural and optical properties have been studied through XRD, FTIR, absorption, luminescence and decay time measurements. The XRD pattern has been used to confirm the amorphous nature of the prepared glasses. The FTIR spectra reveals the presence of B–O vibrations and Te–O stretching modes of TeO 3 and TeO 6 units in the prepared glasses. The UV–vis–NIR absorption spectra were used to calculate the oscillator strength, bonding parameters ( β ¯ and δ) and Judd–Ofelt intensity parameters ( Ω λ , λ = 2, 4 and 6). The radiative transition probability ( A), stimulated emission cross section ( σ P E ) and the experimental, calculated branching ratios ( β R) have been calculated from the luminescence spectra corresponding to 4F 9/2 → 6H 11/2, 6H 13/2, and 6H 15/2 excited state transitions. The structural and optical properties corresponding to the compositional changes were discussed and compared with the similar studies.