Abstract
Rare-earth oxides microparticles doped tellurite-based glass have been studied extensively to improve the capability of optoelectronic devices. We report a detailed comparison between two sets of glass series containing samarium microparticles and nanoparticles denoted as ZBTSm-MPs and ZBTSm-NPs, respectively. The two sets of glass have been successfully fabricated via melt-quenching technique with chemical formula {[(TeO2)0.70 (B2O3)0.30]0.7 (ZnO)0.3}1−y (Sm2O3 (MPs/NPs))y with y = 0.005, 0.01, 0.02, 0.03, 0.04 and 0.05 mol fraction. The TEM analysis confirmed the existence and formation of nanoparticles in ZBTSm-NPs glasses. The density of ZBTSm-NPs glasses was found higher than ZBTSm-MPs glasses due to the distributions of nano-scale particles in tellurite glass network. There was a linear trend of increment in the refractive index in both sets of glass series along with the concentrations of dopants. The refractive index of ZBTSm-NPs glasses was found higher than ZBTSm-MPs glasses due to the shift in compactness of glass structure with nano-scale particles. In comparison, the absorption peaks of ZBTSm-MPs glasses were greater than ZBTSm-NPs glasses which were mainly due to the restriction of electrons mobility in glass network with nano-scale particles. The optical band gap energy in ZBTSm-NPs glasses was found greater than ZBTSm-MPs glasses which correspond to the widening of forbidden gap with nano-scale particles. The polarizability of ZBTSm-NPs and ZBTSm-MPs was found in non-linear trends along with dopant concentrations. Based on these findings, the improvement of optical properties has been made by introducing samarium oxide nanoparticles in tellurite glass which is beneficial for optoelectronic devices.
Highlights
Among chalcogenide oxide groups, tellurite oxide, TeO2 is the most stable oxide
Borotellurite glasses have broader infrared transmittance which is beneficial for optoelectronic devices
The results indicate that the XRD pattern of ZBTSm-MPs and ZBTSm-NPs glass series reveals wide diffusion at lower scattering angles
Summary
Tellurite oxide, TeO2 is the most stable oxide. The effectiveness and usefulness of tellurite oxide for optoelectronics applications have motivated researchers around the world [1 – 4]. Tellurite glasses with small amount of borate oxide are composed of TeO4, BO4, and BO3 groups Such groups may result in a stable structure of tellurite glass and improve its optical properties. The establishment of zinc borotellurite glass doped with samarium oxide will introduce alternative glass materials for possible uses in optoelectronic devices. The aim of this study is to draw comparisons between the impact of samarium oxide microparticles (>100 nm) and samarium oxide nanoparticles (20 - 30 nm) inclusions in the tellurite glass system on their optical properties Optical properties such as optical band gap, Urbach energy, refractive index, molar refraction, metallization criterion, electronic polarization and optical basicity of the glass system have been analyzed
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