Luminescence of the CdS nanoparticles

The procedure of the synthesis of isolated CdS nanoparticles in ortoxylene based solution has been developed. By the methods of transmission X ray microscopy and EXAFS the hexagonal structure of 3nanometer particles has been revealed. The complex behavior of the location of an absorption edge in diffuse transmission and reflection spectra was observed. The conclusion that such a behavior is conditioned by a simultaneous modification of the sample composition, sizes and the number of nanoparticles, and also the refractive index of the solution has been drawn. It is shown, that luminescence of nanoparticles is conditioned by the presence of the defects in their structure. The conclusion that the most probable luminescence centres are the impurity vacancy surface dipoles formed by the excess of cadmium in the particles has been drawn.