Spectroscopic Investigations on Pr3+ ions Doped Lead Telluro-borate Glasses for Photonic Applications

A new series of Lead telluro-borate glasses doped with different concentrations of Pr3+ ions (xPLTB) were prepared by melt quenching technique and their structural and spectroscopic properties were investigated by recording XRD, FTIR, optical absorption and luminescence spectral measurements. XRD measurements confirm the amorphous nature and the FTIR spectra reveal the presence of different vibrational modes of borate and tellurite networks in the prepared glasses. The bonding parameter values (delta) obtained from the absorption band positions indicates that the bonding between Pr3+ ions and their surrounding ligands is of ionic in nature. The optical band gap (E-opt) corresponding to the direct and indirect allowed transitions were determined with the framework of tauc's plot. From the luminescence spectra, important radiative parameters such as stimulated emission cross-section (sigma(E)(P)), branching ratios (beta(R)) and radiative lifetime (tau(R)) were calculated for the dominant emission transition P-3(0) -> H-3(4) (blue) in order to suggest the suitability of the studied glasses for suitable photonic applications.