Lead selenide quantum dot polymer nanocomposites

Authors:Waldron, Dennis, Department of Electrical and Computer EngineeringUniversity of Virginia Preske, Amanda, Department of ChemistryUniversity of Rochester Zawodny, JosephNASA Langley Research Center Krauss, Todd, Department of ChemistryUniversity of Rochester Gupta, Mool, Department of Electrical and Computer EngineeringUniversity of Virginia

Optical absorption and fluorescence properties of PbSe quantum dots (QDs) in an Angstrom Bond AB9093 epoxy polymer matrix to form a nanocomposite were investigated. To the authors' knowledge, this is the first reported use of AB9093 as a QD matrix material and it was shown to out-perform the more common poly(methyl methacrylate) matrix in terms of preserving the optical properties of the QD, resulting in the first reported quantum yield (QY) for PbSe QDs in a polymer matrix, 26%. The 1-s first excitonic absorption peak of the QDs in a polymer matrix red shifted 65 nm in wavelength compared to QDs in a hexane solution, while the emission peak in the polymer matrix red shifted by 38 nm. The fluorescence QY dropped from 55% in hexane to 26% in the polymer matrix. A time resolved fluorescence study of the QDs showed single exponential lifetimes of 2.34 and 1.34 μs in toluene solution and the polymer matrix respectively.

Quantum dots, lead selenide, PbSe, nanocomposites, optical properties, fluorescence
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Source Citation:

Waldron, Dennis, Amanda Preske, Joseph Zawodny, Todd Krauss, and Mool Gupta. "Lead selenide quantum dot polymer nanocomposites." Nanotechnology 26.7 (2015). Available: ["http://dx.doi.org/10.1088/0957-4484/26/7/075705"].

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