Resonant Raman scattering spectra of glass-embedded CdS 1−x Se x nanocrystals are measured and complemented with TEM and optical absorption as well as photoluminescence data. The selectivity of the resonant Raman process not only for the size, but also for the composition of nanocrystals within the ensemble, is directly observed in the dependence of phonon band frequency, linewidth and shape on the excitation wavelength.

The Raman spectra of CdS 1-x Se x nanocrystals, embedded in a borosilicate glass matrix, are studied, CdSlike and CdSe-like LO phonon frequencies being used to determine the nanocrystal composition. The Raman lineshape is analyzed taking account of confinement-related phonons with nonzero wavevector, surface phonon modes, glass matrix pressure and disorder effects.

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The formation of quaternary Cd1−yZnyS1−xSex nanocrystals in a borosilicate glass matrix due to incorporation of zinc into CdS1−xSex quantum dots under heat treatment is investigated by Raman scattering and optical absorption spectroscopy. Average size and composition of the nanocrystals are determined. Factors affecting the accuracy of Raman scattering‐based determination of the mixed nanocrystal composition are analyzed. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)