Abstract
3 d transition-metallic ions doped ZnS quantum dots (Q-dots) were synthesized by the facile wet-chemical process. During synthesis, various ions, i.e. manganese (Mn 2+ ), cobalt (Co 2+ ) and silver (Ag + ), were used and their photoluminescence (PL) response investigated. UV-vis absorption studies show that the various dopant ions can effectively tune energy band structure. The PL emission band is red shifted on Mn 2+ doping (~575 nm) as compared to pure ZnS Q-dots (~420 nm) which is due to 4 T 1 (G) → 6 A 1 (S) radiative transitions. Blue/green-emission peaks at ~487 nm/~508 nm observed, respectively, on Co 2+ /Ag + doping are probably arising from the recombination between the sulfur vacancy level and the new dopant level. Luminescence emission efficiency (LEE) is found to be maximum at 5 mol% Mn 2+ doping and then decreases. On doping by Ag + the LEE is found to be maximum at 2 mol% doping and almost completely quenched at 5 mol% doping. Contrary to the above, Co 2+ quenched the overall PL.
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