Luminescence and decay trends for NIR transition (4I13/2 to 4Il5/2) at 1.5 um in Er3+-doped LBT glasses

Abstract

Erbium oxide (0.5 - 4 mol %) doped lithium boro tellurite (LBT) glasses have been prepared and the NIR emission band at 1.5µm characterized. By pumping with LED excitation sources at 495nm and 970nm, a broader NIR emission transition (4I13/2  4Il5/2) was observed. The Judd-Ofelt intensity parameters were derived for the 1 mol% Er3+ - doped LBT glass and compared with other tellurite host glasses. The full width at half the maximum (FWHM), stimulated emission cross sections and lifetimes for NIR luminescence transitions 4I13/2 to 4I15/2 are reported. For both excitation wavelengths, overall the decay times were found to decrease with increasing erbium content. The present study describes the excitation dependent luminescence properties for this NIR transition.