Anomalous Size-Dependent Decay of Low-Energy Luminescence from PbS Quantum Dots in Colloidal Solution

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...

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Bibliographic Details
Published in:ACS nano 2012-10, Vol.6 (10), p.8913-8921
Main Authors: Ushakova, Elena V, Litvin, Aleksandr P, Parfenov, Peter S, Fedorov, Anatoly V, Artemyev, Mikhail, Prudnikau, Anatoly V, Rukhlenko, Ivan D, Baranov, Alexander V
Format: Article
Language:English
Subjects:
Colloids
Colloids - chemistry
Decomposition
Lead - chemistry
Low energy
Luminescence
Luminescent Measurements - methods
Materials Testing
Nanostructure
Nanostructures - chemistry
Nanostructures - ultrastructure
Particle Size
Photoluminescence
Quantum Dots
Reduction
Selenium Compounds - chemistry
Solutions
Spectroscopy
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Summary: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.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn3029106