Abstract: Cu doped ZnSe nanocrystals were synthesized in aqueous solution, the optical properties of which could be controlled accordingly. By the layer-by-layer self-assembly method, the ZnSe;Cu/polyelectrolytes multilayer film was fabricated successfully, which was characterized by UV-Vis absorption spectra, XPS and TEM et al .. The surface structure of nanoparticles and the valence of copper could be controlled by the surface modification with reflux, indicated by the increasing of fluorescence efficiency and the XPS results. Moreover, the average size of ZnSe;Cu nanocrystals was found to be~3 nm without obvious aggregation. The films assembled in this way can make brighter luminescence possible.

Key words: Nanocrystals, Surface modification, Self-assembly, ZnSe, Cu