Quantum confinement effect in the vibrational spectrum of CdSxSe1-x quantum dots in a fluorophosphate glass matrix

The vibrational spectra of mixed cadmium sulfoselenide nanocrystals in a fl uorophosphate glass matrix are investigated by Raman spectroscopy. The asym metry of the lines of the fundamental modes of nanocrystals is experimental ly observed in the region of lattice vibrations, which is interpreted as a quantum confinement effect. In the framework of the model of confined phono ns, the contribution of the band states to the Raman scattering spectrum is calculated and the size of nanocrystalline regions is estimated. The resul ts obtained are in good agreement with the data on the low-frequency Raman scattering in these objects. (C) 2001 MAIK "Nauka/Interperiodica".