Influence of V2O5 addition as a dopant and dispersed content in barium borophosphate glass on structural and optical properties

Abstract

The Barium Borophosphate glass system with molar compositions 40P<inf>2</inf>O<inf>5</inf>– 25B<inf>2</inf>O<inf>3</inf>-(35-x) BaO-xV<inf>2</inf>O<inf>5</inf> and 40P<inf>2</inf>O<inf>5</inf>–25B<inf>2</inf>O<inf>3</inf>–35BaO-xV<inf>2</inf>O<inf>5</inf> (x = 0,1,3,5 mol%) was synthesized using melt-quenching method. A comprehensive investigation of the structural and optical properties was conducted to compare the effects of V<inf>2</inf>O<inf>5</inf> as a dopant and as an addition to the glass matrix. The physical parameters were assessed through the measurement of density. The influence of V<inf>2</inf>O<inf>5</inf> introduction on vibrational modes was studied through Fourier-transform infrared (FTIR) and Raman spectroscopy. The UV–visible absorbance analysis unveiled the existence of multiple valence states of vanadium (V3+, V4+ and V5+). The reduction in bandgap was determined through the utilization of a Tauc plot, while the measurement of the refractive index allowed for the assessment of its variation with the composition of V<inf>2</inf>O<inf>5</inf>. Photoluminescence spectroscopy (PL) was employed to explore the presence of intrinsic defects within the glass matrix and the impact of V<inf>2</inf>O<inf>5</inf> on the emission spectra. Furthermore, CIE chromaticity coordinates of synthesized samples were observed in both the white and blue regions, suggesting their potential application in display devices. Significantly, V<inf>2</inf>O<inf>5</inf> glass doped with 1 mol% displayed chromaticity, characterized by CIE coordinates x = 0.288 and y = 0.386, closely matching the white region as well as the bandpass filter. The introduction of transition metal oxide dopants into borophosphate glass yielded exceptional emission properties. The ability to modify optical properties makes it more promising for these glass materials, particularly for applications like optical filters and displays. © 2024 Elsevier Ltd and Techna Group S.r.l.