Anomalous size-dependent decay of low-energy luminescence from PbS quantum dots in colloidal solution.
basic_science · Level V
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- Record sourced from PubMed, PMID 22971234.
- Also identified by DOI 10.1021/nn3029106.
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Abstract
We report on an anomalous size dependence of the room-temperature photoluminescence decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which was found using the transient luminescence spectroscopy. The observed 10-fold reduction in the decay time (from ~2.5 to 0.25 μs) with the increase in the quantum dots' diameter is explained by the existence of phonon-induced transitions between the in-gap state-whose energy drastically depends on the diameter-and the fundamental state of the quantum dots.
Medical subject headings
- Colloids
- Lead
- Luminescent Measurements
- Nanostructures
- Quantum Dots
- Selenium Compounds