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 ,...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Applied physics letters 2008-08, Vol.93 (8), p.083106-083106-3
Hauptverfasser: Zhang, Yating, Xu, Zhangcheng
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2975847