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24 April 2024

» pubmed » pmid12398626

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Spectrally resolved dynamics of energy transfer in quantum-dot assemblies: towards engineered energy flows in artificial materials
S A Crooker ; J A Hollingsworth ; S Tretiak ; V I Klimov ;
Date:	28 Oct 2002
Journal:	Phys Rev Lett, 89 (18), 186802
Abstract:	We report on the dynamics of resonant energy transfer in monodisperse, mixed-size, and energy-gradient (layered) assemblies of CdSe nanocrystal quantum dots. Time-resolved and spectrally resolved photoluminescence directly reveals the energy-dependent transfer rate of excitons from smaller to larger dots via electrostatic coupling. The data show a rapid (0.7-1.9 ns) energy transfer directly across a large tens-of-meV energy gap (i.e., between dots of disparate size), and suggest that interdot energy transfer can approach picosecond time scales in structurally optimized systems.
Source:	PubMed, pmid12398626
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