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 qu...

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Bibliographic Details
Main Authors: Young-Nam Hwang, Sanghun Shin, Hong Lee Park, Seung-Han Park, Ung Kim, Hong Sik Jeong, Eun-joo Shin, Dongho Kim
Format: Conference Proceeding
Language:English
Subjects:
Frequency
Glass
Lattices
Nanocrystals
Phonons
Quantum dots
Solids
Temperature measurement
Thermal expansion
US Department of Transportation
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Summary: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.