Session T34: Optical and Electronic Properties of Nanocrystals and Wires

2:30 PM–5:42 PM, Wednesday, March 23, 2011
Room: C141

Sponsoring Unit: DCMP
Chair: Steve Erwin, Naval Research Laboratory

Abstract ID: BAPS.2011.MAR.T34.2

Abstract: T34.00002 : Single-molecule spectroscopy study of interfacial charge separation and energy transfer between quantum dots and conjugated polymers

2:42 PM–2:54 PM

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Authors:

  Zhihua Xu
    (Center for Functional Nanomaterials, Brookhaven National Laboratory)

  Mircea Cotlet
    (Center for Functional Nanomaterials, Brookhaven National Laboratory)

Blends of semiconducting quantum dots (Qdots) and conjugated polymers (CPs) are promising materials for light-emitting diodes or photovoltaic devices. Effective design of optoelectronic devices relies on further understanding of the photophysics in these hybrid materials, including charge separation (CS) and energy transfer (ET). We have studied the photophysics of the blends of two water-soluble conjugated polymers and CdSe/ZnS quantum dots with varying shell thickness, which enable us to control the competitive CS and ET processes by tuning energy-band alignment and interfacial distance. Combining single --molecule spectroscopy with ensemble-based measurements provides deeper understanding of the dynamic interactions at inhomogeneous interfaces.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.T34.2