Abstract: CdS cores were successfully synthesized in noncoordinating solvents. The composite structure of core/shell CdS∶Cu/CdS nanocrystals was obtained through the modification of as-prepared Cu²⁺ ions doped CdS cores using successive ion layer adsorption and reaction (SILAR) technique. The crystal structures, shapes and optical properties of as-synthesized nanocrystals were characterized by X-ray diffraction, transmission electron microscope, UV-Vis absorption and photoluminescence spectroscope. The results show that the crystal structure of asprepared CdS∶Cu/CdS nanocrystal is zinc blende. Compared with pure CdS nanocrystals, the Cu²⁺ dopant in CdS leads the surfacestate related emission peak shifting to longer wavelength. The surfacestate related emission of CdS∶Cu nanocrystal can also be adjusted consecutively from 570nm to 620nm by tuning the doping concentration of Cu²⁺ ions from 2% to 6%. The overcoating of CdS shell can increase the stability of surfacestate related emission of CdS∶Cu nanocrystals.

Key words: CdS∶Cu/CdS, nanocrystals, doping