Abstract
ZnO:Mn nanoparticles with various Mn concentrations (1–7%) were synthesized by a simple chemical method at low temperature. Structural and optical properties of as synthesized samples were investigated by X-ray diffraction (XRD), UV–vis absorbance, and photoluminescence (PL) spectrophotometers, respectively. XRD patterns of the ZnO:Mn nanocrystals indicate that in low Mn concentrations (1 and 3%), the ZnMn2O4 nanoparticles are formed, whereas in high Mn concentrations (5 and 7%), more Mn atoms replace Zn atoms in crystalline lattice, so that Mn3O4 is formed. It is also found that the size of the ZnO:Mn nanocrystals increases from 7.82 to 76.07 nm with increasing Mn concentration from 1 to 7%. Band gap energy of the samples, calculated by extrapolation of (αhν)2 versus hν curves, shows a decrease in band gap with increasing the Mn concentration from 1 to 7%. The size of nanoparticles calculated by effective mass approximation model is nearly in accordance with the one calculated by Scherrer formula. The PL spectra of low Mn concentration ZnO:Mn nanoparticles indicate a weak green emission which vanishes in highly Mn concentrated ZnO:Mn samples.
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