Zinc lithium calcium potassiumniobate phosphate glasses containing Er3+ in (45-x):
P2O5:10ZnO:10Li2O:10CaO:10K2O:15Nb2O5:xEr2O3. (where x=1, 1.5,2 mol %) have been prepared by melt-quenching method.
The amorphous nature of the glasses was confirmed by x-ray diffraction studies. Optical absorption, Excitation, and
fluorescence spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters Ωλ (λ=2, 4, 6) are
evaluated from the intensities of various absorption bands of optical absorption spectra.