Abstract
Recently, the vibrational states of quantum dots have been intensively studied as well as the optical properties due to carrier confinement. Tanaka et al. repotted that phonon energies of CdSe microscystals in a GeO2 glass decrease with decreasing microcrystal size. To the contrary, Scamarcio et al. demonstrated that CdSxSe1−x nanocrystals in a B2O3-SiO2 glass experience lattice contraction leading the blueshift of observed Raman peaks.2 In addition to those experiments, Roca et al. obtained theoretically the phonon frequency for a microcrystal.3 However, the phonon frequency decreases with decreasing size for negative phonon dispersion and does not depend on host material. In this report, a modified expression is proposed, which can explain the observed size- and glass-dependent phonon energies of CdSe quantum dots in B2O3-SiO2 and SiO2 glasses and the previously reported ones in a GeO2 glass.1
© 1996 Optical Society of America
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