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, Victor I Klimov

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Abstract

The strength of Forster coupling between CdSe nanocrystal quantum dots (NQDs) via dynamical studies of energy transfer (ET) in close-packed assemblies of mondisperse and mixed-size samples, and a prototype "energy gradient" bilayer structure was evaluated. Through time-resolved and spectrally resolved photoluminescence (PL) dynamics, a fast PL decay on the blue side of the emission band which was dominated by Forster transfer was observed, providing a direct measure of ET efficiency. This observation agrees with the known band-edge structure in CdSe NQDs, wherein a large energy gap separates the lowest emitting transition from the higher-lying strongly absorbing transitions.

Original languageEnglish
JournalPhysical Review Letters
Volume89
Issue number18
Publication statusPublished - Oct 28 2002

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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