Abstract
Water-soluble ZnSe:Cu quantum dots were synthesised in aqueous solution,ZnSe:Cu/CdS core/shell quantum dots(QDs)with different shell thickness were obtained in this paper.The influence of shell thickness on the optical properties of ZnSe:Cu QDs was studied.The samples were characterized by TEM,XRD,PL and UV-Vis.The results showed that ZnSe:Cu/CdS core/shell QDs have a cubic zinc-blende structure and are spherical with good dispersibility.The average grain size increased from 2.7 to 4.0 nm after the shell modification.The redshift of core/shell QDs compared with the core QDs was observed in both the UV-Vis and the PL spectra,which suggested that the size of core/shell QDs increased.The results proved that CdS shell were coated on the surface of ZnSe:Cu QDs and formed the ZnSe:Cu/CdS core/shell structure QDs.The PL intensity of the ZnSe:Cu QDs decreased with higher stability after being coated by CdS shell.
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