TITLE

Direct observation of the size dependence of Dexter energy transfer from polymer to small PbS quantum dots

AUTHOR(S)
Zhang, Yating; Xu, Zhangcheng
PUB. DATE
August 2008
SOURCE
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p083106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Small PbS quantum dots (QDs) with diameters ranging from 2.5 to 3 nm were synthesized directly in the conjugated polymer poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) at 70 °C. To monitor the size dependence of Dexter energy transfer [D. L. Dexter, J. Chem. Phys. 21, 836 (1953)] from MEH-PPV to PbS QDs, the photoluminescence of MEH-PPV is measured for a series of samples with varying QD sizes controlled by the reaction time. A decreased transfer rate is observed for PbS QDs with a diameter of about 2.65 nm due to the minimum overlap between the emission spectrum of MEH-PPV and the 1Se-1Sh and 1Pe-1Sh transitions of PbS QDs.
ACCESSION #
34198816

 

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