Journal
NANO LETTERS
Volume 12, Issue 10, Pages 5224-5229Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl302390b
Keywords
Colloidal quantum dots; exciton relaxation; fine structure splitting; exciton-phonon coupling
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Funding
- European Community's Seventh Framework Programme [214954]
- FWO-Vlaanderen [G.0794.10]
- Belgian Science Policy [IAP 6.10]
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Exciton dynamics within the band-edge state manifold of CdSe/ZnS and CdSe/CdS quantum dots (QDs) have been investigated. Low-temperature time-resolved photoluminescence (PL) experiments demonstrate that exciton relaxation is mediated by LO phonons, whereas an acoustic phonon bottleneck is observed for splitting energies lower than the optical phonon energy. This has important implications since the main source affecting exciton dephasing is considered to be a spin-flip process. Our results concur with recent observations of long exciton dephasing times in CdSe/CdS QDs and show a way to engineer nanoparticles with enhanced coherence time, a prerequisite for their use in quantum optical applications.
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