Abstract
We present Raman-scattering results for CdTe nanocrystals in doped
glasses which clearly show the confinement effects on the phonon spectra
as a function of the quantum-dot size. We observed optical phonon modes,
surface phonons and some of their overtone combinations. We show that
the surface-phonon scattering intensity increases as the quantum-dot
size decreases. Our results also show a decrease in the electron-phonon
coupling as the nanocrystal size is decreased. These confinement effects
are observed by changing the laser excitation energy, and thus by tuning
to resonance with the optical transitions for quantum dots of different
sizes within their broad size distribution in semiconductor-doped
glasses. (C) 1998 Academic Press Limited.
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