Structural and optical investigations on Dy3+ doped boro-tellurite glasses

Dy3+ doped boro-tellurite glasses were prepared by following melt quenching technique with the chemical composition (69-x) H3BO3 + xTeO(2) + 15Mg(2)CO(3) + 15K(2)CO(3) + 1Dy(2)O(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-Ovibrations and Te-O stretchingmodesof TeO3 and TeO6 units in the prepared glasses. The UV-vis-NIR absorption spectra were used to calculate the oscillator strength, bonding parameters ((beta) over bar and delta) and Judd-Ofelt intensity parameters (Omega(lambda), lambda = 2, 4 and 6). The radiative transition probability (A), stimulated emission cross section (sigma(E)(P)) and the experimental, calculated branching ratios (beta(R)) have been calculated from the luminescence spectra corresponding to F-4(9/2) -> H-6(11/2), H-6(13/2), and H-6(15/2) excited state transitions. The structural and optical properties corresponding to the compositional changes were discussed and compared with the similar studies. (C) 2011 Elsevier B.V. All rights reserved.