Enhancement of Optical Properties of Borate Glass Doped with Vanadium Oxide

Abstract

In this work we examine physical, structural and optical properties of borate glass via experimental and theoretical techniques. The composition of our glass samples is (50-X) B 2 O 3 + 50 Pb 3 O 4 + X V 2 O 5 encoded into [BPV glass system] where x= (0, 0.1, 0.2, 0.3, 0.4 and 0.5) were prepared using melt quenching method. X-ray diffraction technique confirmed the formation of BPV glass system. Characteristic absorption bands were observed in infrared spectra assigned to vibrational modes. The optical properties of the prepared samples were measured using UV-visible spectra and Photoluminescence. The optical energy band gap E g (direct and indirect) calculated using Tauc,s equation and found that direct energy gap decreases from 2.42 ev to 2.26 ev and indirect energy gap decreases from 2.57 ev to 2.52 ev as vanadium oxide increase and that Urbach energy Eu decreased from 0.21 ev to 0.18 ev. The refractive index increased by V 2 O 5 content increased and steepness parameter increased also. The dielectric constant (ε) and optical conductivity (σ) have the same behavior decrease by increasing vanadium oxide content. Photoluminescence shows an emission wavelength that ranges from 400 nm to 1000 nm.