Abstract
The effects of Mg addition on the emission of green photons from ZnO nanoparticleswere studied. Energy dispersive x-ray spectroscopy (EDS) and Auger electronspectroscopy (AES) data demonstrated that ZnO nanoparticles with surfacesegregation of MgO (ZnO:MgO) were precipitated from colloidal reactions betweenZn2+,Mg2+ and OH− ions suspended in ethanol. The photoluminescence emission spectra showed stronger greenemission from suspended ZnO:MgO versus ZnO nanoparticles. ZnO:MgO alsoexhibited a stable green emission colour, which was slightly red-shifted from 495to 520 nm with 168 days of ageing. It was postulated that the presence of MgOon the surface of ZnO prevented both the aggregation of ZnO nanoparticles viaelectrostatic stabilization of the suspension, and the formation of non-radiativerecombination states on the surface, resulting in more intense, stable photoemission fromZnO. The red shift of the green emission from suspended ZnO nanoparticles withextended ageing was attributed to filling of radiative surface trap states in thebandgap.
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