Molecular control of charge and energy transfer in self-assembled polymer films: toward improved ultrafast holographic materials

Brett Kraabel; Alexander A. Mikhailovsky; Hsing-Lin Wang; Duncan W. McBranch

doi:10.1117/12.368299

11 October 1999 Molecular control of charge and energy transfer in self-assembled polymer films: toward improved ultrafast holographic materials

Brett Kraabel, Alexander A. Mikhailovsky, Hsing-Lin Wang, Duncan W. McBranch

Author Affiliations +

Proceedings Volume 3796, Organic Nonlinear Optical Materials; (1999) https://doi.org/10.1117/12.368299
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

We report on the optical characterization of a series of multi-layered organic superlattices made by polyelectrolyte self-assembly. Using a high molecular weight, water-soluble, anionic form of poly-phenylene vinylene, self-assembled films can be formed which show high photoluminescence quantum efficiency (QE). A dramatic red shift of the luminescence and increase in QE is observed as additional PPV layers are added. We attribute the red shift and increasing QE to a changing conformation of the polymer chains as the superstructure is assembled, together with efficient Frster energy transfer in a preferred direction away from the substrate toward layers with longer effective conjugation length. Upon adding a C₆₀ top layer, the luminescence spectrum is strongly quenched. We attribute this to charge transfer of from the top-most polymer layer to the C₆₀ layer. We discuss the possibilities of exploiting this directional charge transfer in an ultrafast holographic device along with other optics for increasing the temporal diffraction efficiency of polymer-based mediums.

Citation Download Citation

Brett Kraabel, Alexander A. Mikhailovsky, Hsing-Lin Wang, and Duncan W. McBranch "Molecular control of charge and energy transfer in self-assembled polymer films: toward improved ultrafast holographic materials", Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); https://doi.org/10.1117/12.368299

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