Optical properties of Cd1-xZnxS nanocrystallites in sol-gel silica matrix

Cd1-xZnxS nanoparticles with different compositions (0 less than or equal to x less than or equal to 1) embedded in silica matrix were prepared in thin film form by the sol-gel technique. The film texture and structural transformation with increasing x value were studied from transmission electron micrographs and electron diffraction patterns. Optical study indicated increase in optical bandgap and decrease in refractive index with increasing zinc content (x value). Photoluminescence studies showed emission from surface states with emission energy blue shifted with increasing zinc content in the films. Annealing behaviour of the films with increasing annealing temperature and time was studied.