title: Lead selenide quantum dot polymer nanocomposites.
abstract: 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.
authors: Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA 22904, USA.
authors: Dennis L
authors: DL
authors: Waldron
authors: Amanda
authors: A
authors: Preske
authors: Joseph M
authors: JM
authors: Zawodny
authors: Todd D
authors: TD
authors: Krauss
authors: Mool C
authors: MC
authors: Gupta