Abstract

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.^1,2 In this work we present a detailed study of the dynamics of Förster energy transfer in commercially-important polyfluorene- based polymer blend systems using time-resolved photoluminescence spectroscopy. We find that the conventional description based on the Förster 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 Förster processes in polymer blends.

© 2002 Optical Society of America