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In the present work, the feasibility study of growth doping strategy for direct preparation of Ru-doped ZnS quantum dots (QDs) in aqueous solution is investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), UV–vis absorption, and photoluminescence (PL) emission spectroscopies. Structural investigations indicated that the Ru-doped ZnS QDs were about 3 nm in size, showing size-dependent optical properties of the prepared QDs. Specifically, three different peaks are observed in photoluminescence spectra of Ru-doped ZnS specimens; a very weak excitonic emission at about 350 nm, the blue trap-related emission around 420 nm, and a strong cyan dopant-related emission at about 450 nm. Various parameters such as solution pH, refluxing temperature and precursors molar ratios were observed to have significant effects on emission properties of the as-prepared QDs. By …