Abstract
Mn2+-doped ZnS nanoparticles of average size 2.5±0.3 nm have been studied and characterized in the dopant concentration range 0.1–0.3% using XRD, EPR, XPS and photoluminescence methods. The experimental results obtained from these studies indicate that the doping of Mn2+ occurs primarily at the T d sites at low dopant concentration, causing the4T1(G) → 6A1(S) transition to take place in the host lattice; the observed decrease in the intensity of photoluminescence at high dopant concentration is due to the setting in of the strong Mn2+–Mn2+ interaction arising from cluster formation at the highly distorted sites near the particle surface.
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