Direct observation of the size dependence of Dexter energy transfer from polymer to small PbS quantum dots
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 ,...
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Veröffentlicht in: | Applied physics letters 2008-08, Vol.93 (8), p.083106-083106-3 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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
1
S
e
-
1
S
h
and
1
P
e
-
1
S
h
transitions of PbS QDs. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.2975847 |