Spectral analysis of Sm 3+ and Dy 3+: B 2O 3–ZnO–PbO glasses

Abstract

This paper reports on the spectral results of Sm 3+ or Dy 3+ (1.0 mol%) ions-doped B 2O 3–ZnO–PbO (BZP) glasses. Measurements of X-ray diffraction (XRD), differential scanning calorimeter (DSC) profiles of these rare-earth ion-doped glasses have been carried out. From the DSC thermograms, glass transition ( T g), crystallization ( T c) and melting ( T m) temperatures have been evaluated. Direct and indirect optical band gaps have been calculated based on the glasses UV absorption spectra. These glasses have shown strong absorption bands in the near-infrared (NIR) region and their oscillator strengths have been computed. Emission bands of 4G 5/2→ 6H 5/2 (564 nm), 4G 5/2→ 6H 7/2 (602 nm), 4G 5/2→ 6H 9/2 (647 nm) and 4G 5/2→ 6H 11/2 (710 nm) for the Sm 3+: glass, with excitation at 6H 5/2→ 4I 9/2 (484 nm) have been recorded. Of them, 4G 5/2→ 6H 7/2 (602 nm) has shown a bright emission. With regard to the Dy 3+: glass, a bright fluorescent yellow emission at 576 nm ( 4F 9/2→ 6H 13/2) has been observed, apart from 4F 9/2→ 6H 15/2 (484 nm) and 4F 9/2→ 6H 11/2 (666 nm) emission transitions with excitation at 450 nm ( 6H 15/2→ 4I 15/2) excitation wavelength. Stimulated emission cross-sections of all the emission bands of Sm 3+ and Dy 3+: BZP glasses have been computed based on their measured Δ λ (FWHM) and measured lifetimes ( τ m).