Influence of samarium ions doping on electrical and optical properties of bismuth antimony fluoroborate glasses

The traditional melt quenching method is used to synthesize the various trivalent samarium ion concentrations doped Bismuth-Antimony-Fluoroborate glasses (BiSFB). Physical, structural, spectroscopic, and electrical properties of the prepared glasses are examined. X-ray diffraction (XRD) and FTIR spectra were used to analyze the amorphous nature and functional groups present in the prepared glasses. Judd-Ofelt (JO) intensity parameters Omega 2, Omega 4, and Omega 6 follow the trend Omega 4 > Omega 6 > Omega 2 for all concentrations. Radiative parameters for the fluorescent levels of Sm3+ ions in BiSFB glasses are calculated using JO parameters. The PL spectra show three emission bands at 562, 599, and 646 nm. The effective bandwidth and stimulated emission cross sections have relatively high values for 0.5 mol% concentration of Sm3+ ion for 4G5/2 -> 6H7/2 transition among all the prepared glasses. Relatively high quantum efficiency calculated via decay curves shows 0.5 mol% concentration of Sm3+ ion to be optimum for solid-state lighting and optoelectronic devices. CIE color coordinates also confirm the red and orange-red emission for the prepared glasses. The dielectric properties (dielectric constant (epsilon '), dielectric loss (epsilon '')), Nyquist plot, electrical ac conductivity (sigma ac), and dc conductivity of these glasses with variation in frequency have also been studied at the ambient temperature. With an increase in applied frequency, particularly in the high-frequency region, the ac and dc conductivities are increased. Analysis of optical and electrical properties suggests the application of present glasses in optoelectronic devices and solid-state ionic materials.