Phys. Rev. Lett. 89, 186802 (2002) [4 pages]Spectrally Resolved Dynamics of Energy Transfer in Quantum-Dot Assemblies: Towards Engineered Energy Flows in Artificial MaterialsReceived 4 June 2002; published 14 October 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.186802
DOI:
10.1103/PhysRevLett.89.186802
PACS:
73.63.Kv, 42.70.Nq, 73.21.La, 78.47.+p
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