A Study of Structural, Optical and Photoluminescence Properties of Pr Ions Doped Sodium Bismuth Borosilicate Glasses.

In this work, the conventional melt quenching approach is used to synthesize the Pr doped NaF-BiO-BO-SiO (NBBS) glasses. The influence of Pr ions on their spectroscopic and structural characteristics in glass network is investigated. The amorphous nature of the samples has been amply verified by X-ray diffraction patterns. FTIR spectra show distinct basic vibrational bands in borate and silicate structural components (in the range from 500 to 3750 cm). In the UV-visible range, the absorption spectra showed four Pr ion absorption bands. Furthermore, in the absorption spectra, four Pr ion absorption bands were observed in the NIR regions (1300-2470 nm). While utilizing Tauc plots to assess optical bandgap (Eg), it is observed that as the concentration of Pr increases from 0 mol% to 1.5 mol%, the bandgap decreases from 3.67 eV to 3.50 eV. In luminescence spectra, seven bands can be observed at about 483, 524, 534, 580, 604, 643, and 682 nm as a consequence of Pr ion transitions. Strong variations in the emission band's intensity are seen at around 604 nm (P→H), after a progressive increase in Pr mol% in the glass matrix. According to CIE coordinates, emission changes from orange to reddish-orange as the quantity of Pr ions rises.