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ACS Nano. 2012 Oct 23;6(10):8913-21. doi: 10.1021/nn3029106. Epub 2012 Sep 21.

Anomalous size-dependent decay of low-energy luminescence from PbS quantum dots in colloidal solution.

Author information

1
National Research University of Informational Technologies, Mechanics and Optics, 197101 Saint Petersburg, Russia.

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.

PMID:
22971234
DOI:
10.1021/nn3029106
[Indexed for MEDLINE]

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