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Our results pertaining to the step by step enhancement of photoluminescence(PL) intensity from ZnS:Ag,Al quantum dots (QDs) are presented. Initially,these QDs were synthesized using a simple co-precipitation technique involvinga surfactant, polyvinylpyrrolidone (PVP), in de-ionised water. It was observedthat the blue PL originated from ZnS:Ag,Al QDs was considerably weak and notsuitable for any practical display application. Upon UV (365 nm) photolysis,the PL intensity augmented to ~170% and attained a saturation value after ~100minutes of exposure. This is attributed to the photo-corrosion mechanismexerted by high-flux UV light on ZnS:Ag,Al QDs. Auxiliary enhancement of PLintensity to 250% has been evidenced by subjecting the QDs to high temperatures(200oC) and pressures (~120 bars) in a sulphur-rich atmosphere, which is due tothe improvement in crystallanity of ZnS QDs. The origin of the bright blue PLhas been discussed. The results were supported by x-ray phase analysis,high-resolution electron microscopy and compositional evaluation.

Facile synthesis and step by step enhancement of blue photoluminescence from Ag-doped ZnS quantum dots