GROWTH-KINETICS OF CDS NANOCRYSTALLITES IN GLASS THROUGH QUANTUM-SIZEEFFECTS

Glasses containing very small particles of CdS are prepared and their properties studied. Changes in the optical absorption spectra of CdS g lass result from quantum confinement effects. With very small particle size, large confinement energies of up to 4 eV are obtained, which ha ve not been before. The blue-shifts in the optical absorption spectra show that the growth rate of the particles at short times are diffusio n controlled, and the activation energy for growth is calculated. The band gaps of the CdS nanocrystallites in glass are determined from pho toluminescence measurements, which show a high-energy peak, correspond ing to the band gap, that had not been previously observed.