Nanocrystalline undoped and Mn doped zinc sulphide (ZnS) thin films were synthesized by
a wet chemical route without using any capping agent. The x-ray diffraction pattern
showed the typical interplanar spacings corresponding to the cubic phase of ZnS.
Transmission electron microscopy (TEM) studies confirmed the nanocrystalline nature with
an average particle size nm. Compositional information was obtained from the energy dispersive x-ray studies. A
UV–visible optical spectroscopy study was carried out to determine the bandgap of the
nanocrystalline ZnS and it showed a blue-shift with respect to the bulk value.
Variation of bandgap energies with annealing temperature was also studied in
detail. A photoluminescence (PL) study of the ZnS and ZnS:Mn films at room
temperature (300 K) indicated a strong luminescence band at energy 2.07 eV.
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