Abstract
Trivalent holmium doped zinc-aluminium-sodium-phosphate (ZANP) glasses were prepared by conventional melt-quenching technique and characterized for their structural and luminescence properties. The amorphous nature, elemental analysis and thermal stability of the glasses were studied by using X-ray diffraction, energy dispersive spectrum and differential scanning calorimetry analysis, respectively. The absorption and fluorescence spectra have been recorded at room temperature. Based on the absorption spectra, the Judd-Ofelt parameters and radiative parameters such as spontaneous transition probabilities (AR), branching ratios (βR), radiative lifetimes (τR) were calculated and discussed. From the emission spectra emission peak positions (λP), effective bandwidths (Δλeff) and stimulated emission cross-sections (σP) were calculated for the observed emission transitions,5S2 (5F4→5I8) and 5F5→5I8 in all the glass samples. The stimulated emission cross-section is higher for ZANPHo10 glass matrix and so it may be useful for laser excitation.
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