Abstract
In this work, core–shell ZnSe/ZnS quantum dots (QDs) with excellent blue light emission were successfully synthesized in aqueous solution using thioglycolic acid as a stabilizer, thiourea as a sulphur source, and zinc acetate dihydrate as a Zn source. The crystal structure and optical properties of the as-synthesized ZnSe/ZnS QDs were characterized using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, photoluminescence (PL) and UV–Visible spectroscopy. The ZnSe/ZnS QDs had a cubic zinc blende crystalline structure with an average particle size of approximately 4.6 nm. The excitonic emission slightly shifted to a longer wavelength and the PL intensity increased considerably with the growth of the ZnS shells. Meanwhile, the PL quantum yield of the ZnSe/ZnS QDs increased to 58.5%, which was much higher than that of ZnSe QDs. The exciton radiative lifetimes were approximately 46.3 and 23.1 ns for the core–shell ZnSe/ZnS QDs and ZnSe QDs, respectively.
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