Spectral and Luminescence Properties of Manganese Doped Sodium Lead Alumino Borosilicate Glass System

Abstract

Glass system of composition 20Na2O-10PbO-(5-x)Al2O3-40B2O3-25SiO2: xMnO with ranging from 0.3 to 0.9 mol% has been prepared by melt quenching technique. Further, the samples have been characterized by X-ray diffraction technique (XRD). A number of studies have been carried out, viz., Optical absorption and photoluminescence techniques. Glass formation is confirmed by X-ray diffraction spectra. The optical absorption spectra of these glasses has exhibited a predominant broad band peak at about 21,052 cm-1 (475 nm) is identified due to 6 A1g(S)→ 4 T1g(G) octahedral transition of Mn 2+ ion. From the optical absorption spectral data, optical band gap (Eopt) and Urbach energy (ΔE) are evaluated. The emission spectra of Mn 2+ : NPABS glasses have shown single and broad emission band at about 600 nm assigned to electronic transition 4 T1g (G)→ 6 A1g(S) displaying red emission upon excitation at 413 nm. Octahedral coordination of Mn 2+ ions has been estimated from the positions of emission in luminescence spectra. Various physical properties and optical basicity are also evaluated with respect of the concentration of Mn (II) ions.