Green synthesis of highly luminescent ZnS:Mn quantum dots.

Wurtzite-type ZnS:Mn quantum dots (QDs) were successfully prepared by a simple hydrothermal method at 180 °C without any surface-active agent. The XRD and EDAX results showed that Mn ions were incorporated into ZnS lattice. The average size of ZnS:Mn QDs was about 5.43 nm. The maximum concentration of Mn ions in ZnS QDs was 3.81 %. The yellow-orange emission coming from the T-A transition of Mn ions was observed in photoluminescence spectra, the peak intensity increased as the Mn doped ratio increased, and showed a maximum when the concentration of Mn ions kept at 3 %. [ABSTRACT FROM AUTHOR]