Abstract

• Pr3+ doped borate glasses with chemical composition of (60-x) B2O3 - 15ZnO -10Li2O - 15SrO - xPr2O3 (x = 0, 0.25, 0.50, 0.75 mol%) had been prepared by the melt quenching technique and characterized by X-Ray Diffractometer (XRD), UV-Vis Spectrometer and Photoluminescence (PL) Spectrofluorometer. The XRD pattern confirmed the amorphous state for all the glass samples. Optical absorption spectra comprise of four transitions as the prominent absorption spectra from the ground state 3H4 to the excited states within UV-Vis region. The excitation spectra of the Pr3+ doped glass samples were monitored at 605 nm. In the photoluminescence spectra the four peaks of down- converted emission bands are observed under excitation wavelength of blue light. The emission bands are centered at 485 nm (blue), 545 nm (green), 605 nm (orange) and 645 nm (red) at the visible region. Out of four bands, orange emission (605 nm) was the most intense. The intensity of the peaks in the emission spectra increase with increasing concentration of Pr3+ ions up to 0.50 mol% and then decrease. The results indicated that the glass sample with 0.50 mol% Pr3+ emits reddish orange color with highest intensity among the prepared glass samples.