"Modifications to the Efficiency and Stability of Polymer-Based Optoelectronic Materials using Plasmonic Nanostructures"
Thin-film conjugated polymer materials are emerging as versatile alternatives to inorganic semiconductors for photovoltaic, display and solid-state lighting applications. Additionally, polymer-based optoelectronic devices can exhibit small device embodied energies (due to comparatively low temperature and low energy-use fabrication processes) which is of interest for reducing the overall optoelectronic device cost and life-cycle energy consumption. However, further improvements in the energy conversion efficiency and stability of polymer-based optoelectronics are necessary and require effective nanophotonic light management such as nanoscale light trapping and light extraction.
Here, we show that the morphology of conjugated polymer thin films on nanostructured metal electrodes strongly influences whether nanophotonic and plasmonic electromagnetic modes are absorbed or emitted from the polymer-based thin films. We find that light trapping and absorption are improved using semicrystalline conjugated polymer thin films; while more efficient light emission occurs using amorphous conjugated polymers. Furthermore, our recent work on improving the stability of blue- emitting organic light-emitting diode (OLED) materials will be presented. We show that nanostructured metal surfaces can be employed to shorten the triplet exciton lifetime in these materials, which leads to improvements in their photostability.
~Coffee/tea will be served prior to lecture~