Abstract
The synthesis and fluorescence properties of watersoluble ZnSe:Fe/ZnS core/shell quantum dots with Lcysteine as the stabilizer in aqueous solution are reported in this paper. The structure, component and fluorescence properties of quantum dots were characterized by X-ray powder diffraction (XRD),infrared spectrum(IR),UV-Vis absorption spectrum and photoluminescence(PL). XRD studies present that the L-cysteine modified ZnSe:Fe/ZnS core/shell quantum dots have a cubic zinc-blende structure. The photoluminescence emission intensity of the L-cysteine modified ZnSe:Fe/ZnS core/shell quantum dots is enhanced by coating ZnS shell on the surface of core d-dots. The PL intensity of the ZnSe:Fe/ZnS core/shell quantum dots increase at the beginning and decrease with further growth of the ZnS shell, which achieve the maximum when nshell/ncore=0.75:1. After doped with Fe and coated with ZnS shell, the fluorescence quantum yields of the as prepared quantum dots increased from 10.83 % to 18.70%
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