The influence of matrix on the quantum size effect of CdSe microcrystals-doped thin films

CdSe microcrystals were successfully dispersed in GeO2 glass and CaF2 cryst al thin films by rf-sputtering. All films prepared showed the blue shift of absorption edge in visible spectra due to quantum size effect. The amount of the blue shift of the films increased with decreasing the size of the mi crocrystals. Comparing the amount of the particle size-depending blue shift of CdSe microcrystals dispersed in between the GeO2, CaF2 and SiO2 matrici es, the influence of the matrix on the shift was found. Therefore, it can b e said that there is an influence of the matrix on the quantum size effect. From the modified theoretical calculation, the influence of matrix was con sidered to appear through Coulomb interaction between electrons and holes. (C) 2000 Kluwer Academic Publishers.