Effect of anionic concentration on the structural and optical properties of nanostructured ZnS thin films

Nanostructured Zinc Sulfide (ZnS) thin films with wurtzite structure were prepared by chemical spray pyrolysis method at low temperature. The effect of sulfur concentration on the structural and optical properties of ZnS thin films was studied. The films were analysed by x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), UV-Vis spectroscopy and photoluminescence (PL). Nano grain formation of ZnS was observed from XRD and SEM. Variation in band gap of different films is in agreement with size effects. But there is a red shift in the band gap of these films compared to bulk ZnS. This is due to band tailing effect experienced by the films due to the presence of large number of defects which was verified by PL spectrum. The overall emission was blue in colour for all the films and it was confirmed by Commission International d'Eclairage (CIE) diagram. (C) 2016 Elsevier B.V. All rights reserved

Zinc gallate and its starting materials in solid state reaction route- A comparative study

ZnGa2O4 belonging to the class of inorganic compounds with spinel structure is a self activated phosphor having wide applications in display devices. We report the synthesis and characterization of ZnGa2O4 using conventional solid state reaction method and a comparative study of its properties with commercial ZnO and Ga2O3 fired under similar conditions. XRD results proved that the zinc gallate phosphor is cubic in structure with an average grain size of 25 nm. Rectangular porous nature of zinc gallate phosphor is obtained from the SEM analysis. From the diffuse reflectance spectrum, the band gap of zinc gallate (4.74 eV) was evaluated to be between that of ZnO and Ga2O3. This ternary phosphor showed a bluish green emission with Commission International d'Eclairage (CIE) coordinates x = 0.26 and y = 036 under the excitation by UV light. (C) 2016 Elsevier B.V. All rights reserved

Nanostructured zinc oxide thin film by simple vapor transport deposition

Zinc oxide (ZnO) nanostructures find applications in optoelectronic devices, photo voltaic displays and sensors. In this work zinc oxide nanostructures in different forms like nanorods, tripods and tetrapods have been synthesized by thermal evaporation of zinc metal and subsequent deposition on a glass substrate by vapor transport in the presence of oxygen. It is a comparatively simpler and environment friendly technique for the preparation of thin films. The structure, morphology and optical properties of the synthesized nanostructured thin film were characterized in detail by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and photoluminescence (PL). The film exhibited bluish white emission with Commission International dEclairage (CIE) coordinates x = 0.22, y = 0.31. (C) 2015 Elsevier Ltd. All rights reserved