Temperature dependence of exciton diffusion in conjugated polymers.

Modelling exciton diffusion in disordered conjugated polymers

We present a combined quantum-chemical and Monte Carlo approach for calculating exciton transport properties in disordered organic materials starting from the molecular scale. We show that traps and energetic disorder are the main limitations for exciton diffusion in conjugated polymers. An analytical model for exciton hopping in a medium of sites with uncorellated energetic disorder gives a qu...

Use of Picosecond Fluorescence Dynamics as an Indicator of Exciton Motion in Conjugated Polymers: Dependence on Chemical Structure and Temperature

The Journal of Physical Chemistry B is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Article Use of Picosecond Fluorescence Dynamics as an Indicator of Exciton Motion in Conjugated Polymers: Dependence on Chemical Structure and Temperature Thomas G. Bjorklund, Sang-Hyun Lim, and Christopher J. Bardeen J. Phys. Chem. B, 2001, 105 (48), 11970-11977 •...

Understanding molecular structure dependence of exciton diffusion in conjugated small molecules

Energy migration in conjugated polymers: the role of molecular structure.

Conjugated polymers undergo facile exciton diffusion. Different molecular structures were examined to study the role of the excited state lifetimes and molecular conformations on energy transfer. There is a clear indication that extended fluorescence lifetimes give enhanced exciton diffusion as determined by fluorescence depolarization measurements. These results are consistent with a strong el...

Ion-induced formation of charge-transfer states in conjugated polyelectrolytes.

We use time-resolved optical spectroscopy to demonstrate that the luminescence quenching observed when ions are incorporated in films of conjugated polymers can be explained by the formation of charge-transfer (CT) states that are stabilized by the Coulomb field of ions. Our investigation is focused on a conjugated polyelectrolyte (CPE) derived from F8BT (poly(9,9'-dioctylfluorene-alt-benzothia...