Abstract
The undoped and Mn-doped ZnO(1−x)Sx nano-powders were successfully synthesized by precipitation method without using any capping agent. Its structure, morphology, elemental analysis, optical and luminescence properties were determined by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), UV–vis spectroscopy (UV) and photoluminescence spectroscopy (PL). A typical SEM image of the un-doped ZnO(1−x)Sx nanoparticles exhibit flake like structures that changes to nearly spherical particles with Mn-doping. The XRD of undoped and Mn doped ZnO(1−x)Sx pattern reveals the formation of a product indexed to the hexagonal wurtzite phase of ZnS. The nanopowders have crystallite sizes estimated from XRD measurements were in the range of 10–20nm. All the samples showed absorption maximum of ZnO(1−x)Sx at 271nm and high transmittance in UV and visible region, respectively. The undoped ZnO(1−x)Sx nanoparticles show strong room-temperature photoluminescence with four emission bands centering at 338nm, 384nm, 448nm and 705nm that may originate to the impurity of ZnO(1−x)Sx, existence of oxide related defects. The calculated bandgap of the nanocrystalline ZnO(1−x)Sx showed a blue-shift with respect to the Mn-doping. The PL spectra of the Mn-doped samples exhibit a strong orange emission at around 594nm attributed to the 4T1–6A1 transition of the Mn2+ ions.
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