Temperature-Tuning of Near-Infrared (1.5µm) Monodisperse Quantum Dot Solids Toward Controllable Förster Energy Transfer
Alivisatos, A. Paul and Lieber, Charles M.
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.
R. Bose et al., "Temperature-Tuning of Near-Infrared (1.5µm) Monodisperse Quantum Dot Solids Toward Controllable Förster Energy Transfer," Nano Letters, American Chemical Society (ACS), Jan 2008.
The definitive version is available at http://dx.doi.org/10.1021/nl8011243
Mechanical and Aerospace Engineering
Article - Journal
© 2008 American Chemical Society (ACS), All rights reserved.