Raman shifts of CdSe quantum dots in glass matrices

Summary form only given. Recently, the vibrational states of quantum dots have been intensively studied as well as the optical properties due to carrier confinement. In this report, a modified expression is proposed, which can explain the observed size- and glass-dependent phonon energies of CdSe quantum dots in B/sub 2/O/sub 3/-SiO/sub 2/ and SiO/sub 2/ glasses and the previously reported ones in a GeO/sub 2/ glass. We obtain the phonon frequency w(R) of microcrystal with radius to R considering phonon-frequency shifts due to phonon dispersion and lattice contraction.