Temperature-tuning of near-infrared monodisperse quantum dot solids at 1.5 microm for controllable forster energy transfer.
basic_science · Level V
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- Record sourced from PubMed, PMID 18512994.
- Also identified by DOI 10.1021/nl8011243.
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Abstract
We present the first time-resolved cryogenic observations of Forster energy transfer in large, monodisperse lead sulfide quantum dots with ground-state transitions near 1.5 microm (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) (-1), measured with our confocal single-photon counting setup at 1.5 microm 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.