Investigations of the Photo-Physical Properties of Novel Photo-Voltaic and Light Emitting Materials
Final rept. 1 Mar 2001-29 Feb 2004
WAYNE STATE UNIV DETROIT MI DEPT OF CHEMISTRY
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Understanding photophysical properties of optoelectronic materials and the discovery of new materials provide a great challenge for researches interested in applications. This report highlights the distinctive optical properties of dendrimers branched chromophore systems as well as dendrimer encapsulated metal nanoparticles which provide a novel approach toward this challenge. Excitation energy transport properties in these materials were investigated by ultrafast fluorescence anisotropy decay. It was found that the strength of interactions among chromophore units determines the mechanism of the mode of energy transport. The synthesis of several novel branching structures, photoactive dendrimers as well as dendrimer encapsulated lanthanide and metal nanoparticles was achieved. Local field effects contributed strongly to the enhanced nonlinear properties in chromophore-functionalized dendrimer nanocomposites. The sensitized lanthanide emission suggested that this material was useful for light-emitting and optical amplifier. Correlation of anisotropy decay time with the enhanced two-photon absorption provided a new design criterion for large two-photon materials. Furthermore, various techniques including steady-state optical measurements, time-resolved upconversion spectroscopy, nonlinear absorption, transient absorption were used to characterize a variety of optical properties of the materials of interest.
- Polymer Chemistry