SOLID-SOLUTION OF CDYZN1-YS NANOSIZED PARTICLES - PHOTOPHYSICAL PROPERTIES

Optical properties of CdyZn1-yS nanoparticles differing by their size and composition are presented. The fluorescence quantum yield increase s with increasing particle size and composition (y). The photoluminesc ence, PL, spectra are due to defect states and follow the quantum size effect. A red-shift in the fluorescence spectrum with increasing cadm ium composition and particle size is observed which is attributed to a transition from the valence band to a deeply trapped hole. Both absor ption and fluorescence spectra in various media and at temperatures fr om 77 to 300 K are presented.