Dynamics of Forster energy transfer in polyfluorene-based polymer blends

Summary from only given. Polymer blend systems have become increasingly important for use in organic light emitting diodes, offering improved device performance through balanced carrier injection and reduced self-absorption losses. In this work we present a detailed study of the dynamics of Forster energy transfer in commercially-important polyfluorene based polymer blend systems using time-resolved photoluminescence spectroscopy. We find that the conventional description based on the Forster radius is not readily applicable due to the poorly defined inter-molecule separation in the blend systems. By using the Langmuir-Blodgett technique to prepare layered nanostructures with precisely controlled host-guest separation, we have demonstrated accurately controllable transfer times and obtained improved understanding of the Forster processes in polymer blends.