The effect of matrix on CdS nanoparticles photoluminescence

Abstract

The nanocomposite contained CdS nanoparticles of an average about 2 nm have been synthesized using three types of matrix based on silica in soft and hard conditions. As was demonstrated using the methods of spectrophotometry and luminescence in the UV, visible and NIR region, the optical properties of the nanocomposite significantly depend on the surrounding matrix and synthesis conditions. The results indicate that CdS nanoparticles contain a large number of atomic structure defects. It was found that the formation of nanoparticles within the oxygen-contained matrix effects on the long wave photoluminescence. The soft conditions of the synthesis allow to obtain CdS nanoparticles with a photoluminescence band at 2.59 and 2.67 eV, which is associated with exciton recombination.