Title

Temperature-Tuning of Near-Infrared (1.5µm) Monodisperse Quantum Dot Solids Toward Controllable Förster Energy Transfer

Editor(s)

Alivisatos, A. Paul and Lieber, Charles M.

Abstract

We present the first time-resolved cryogenic observations of Förster energy transfer in large, monodisperse lead sulfide quantum dots with ground-state transitions near 1.5 µm (0.8 eV), in environments from 160 K to room temperature. The observed temperature-dependent dipole-dipole transfer rate occurs in the range of (30-50 ns)ˉ¹, measured with our confocal single-photon counting setup at 1.5 µm wavelengths. By temperature-tuning the dots, 94% efficiency of resonant energy transfer can be achieved for donor dots. The resonant transfer rates match well with proposed theoretical models.

Department(s)

Mechanical and Aerospace Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 American Chemical Society (ACS), All rights reserved.

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