Photoluminescence study of Sm3+ doped Zinc Lead Tungsten Tellurite glasses for reddish-orange photonic device applications

Zinc lead tungsten tellurite glasses with varying concentration of samarium ions were synthesised by melt quench method and studied their absorption, excitation, emission and decay spectral features to understand their utility in visible photonic devices. The bonding parameter evaluated from the absorption spectra reveals the nature of bonding between Sm3+ ions and its surrounding ligands as ionic. Judd-Ofelt intensity parameters estimated from absorption spectral features are used to evaluate radiative parameters for the fluorescent levels of Sm3+ ions in these glasses. The bandwidths (Delta lambda(p)), emission cross-sections (sigma(se)), and branching ratios (beta(R)) were evaluated from the emission spectra. The experimental lifetimes measured are correlated with radiative lifetimes and were used to determine the quantum efficiency (eta) of the titled glasses. Relatively higher values of sigma(se), beta(R), eta and CIE coordinates obtained for 1 mol% of Sm3+ ions in the as prepared glass reveals its suitability for visible photonic devices.