Tuning of smart cobalt doped borate glasses by electron beam as band-pass filters

Abstract

CoO (0.2, and 0.7 wt%) doped lithium borate glass samples according to the composition of 84 % B2O3 + 12 % Li2O + 4 % Al2O3 have been prepared by melt quenching technique. Archimedes's method was used to compute the molar volumes of the formed glasses by measuring their density. For the purpose of analyzing the band-pass glass filter and UV-IR cut-off, the optical spectroscopic features of the obtained lithium borate glasses were evaluated over the entire wavelength range from 190 to 1100 nm. The effect of CoO doping ratios (0.2, and 0.7 wt%) on the optical properties of the prepared glass samples (refractive index, optical and electrical conductivity, reflection loss (RL), optical transmission (Toptical), extinction coefficient, permittivity, dielectric constants, electric susceptibility and polarizabilities) were studied. The decrease in ETauc and increase in UV–Visible cutoff range with the increase of CoO content is due to the increase of the non-bridging oxygen concentration. Co2+ ions are detected in both tetrahedral and octahedral positions in the glass matrix, according to the electron paramagnetic resonance EPR spectra. The transmittance data of the glass filters revealed that they have a broad band-pass in the Vis-NIR region. The electron beam irradiation showed an increase in the stopping range of the prepared glasses as band pass filters which makes them available for a wide-range of optical equipment including lenses and laser shields, as well as optoelectronic and photovoltaic apparatus.