Phonons and exciton recombination in CdSe/ZnSe self-assembled quantum dots

We report resonant photoluminescence from CdSe/ZnSe self-assembled quantum dots. When CdSe quantum dots are resonantly excited, excitonic sharp micro-photoluminescence peaks originating from individual quantum dots are strongly enhanced in the region corresponding to optical phonon energies below th...

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Bibliographic Details
Published in:Applied physics letters 2000-09, Vol.77 (12), p.1813-1815
Main Authors: Rho, H., Robinson, L. M., Smith, L. M., Jackson, Howard E., Lee, S., Dobrowolska, M., Furdyna, J. K.
Format: Article
Language:English
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Summary:We report resonant photoluminescence from CdSe/ZnSe self-assembled quantum dots. When CdSe quantum dots are resonantly excited, excitonic sharp micro-photoluminescence peaks originating from individual quantum dots are strongly enhanced in the region corresponding to optical phonon energies below the excitation. The phonons active in this process are identified as the longitudinal optical (LO) phonons from the CdSe dots, as the interface phonons, and tentatively as the LO phonons from the two-dimensional-like precursor layers. These observations suggest that exciton recombination via phonons is a major relaxation process under resonant excitation.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1311393