Abstract
The dynamics of the exciton transport in poly(p-phenylene vinylene) (PPV) blended with a low concentration of fullerene molecules is monitored by time-resolved photoluminescence measurements. The diffusion driven motion of excitons toward these scavengers is modeled using a theory based on a random walk of a particle on lattice sites with traps. From this analysis an exciton diffusion constant of (4 +/- 0.5)x10(-4) cm(2)/s and a diffusion length of 7 nm are obtained. These exciton transport parameters are equivalent to results obtained in bilayer polymer/fullerene heterostructures, demonstrating that the exciton dynamics in PPV are dominated by a one-dimensional migration perpendicular to the film.
| Original language | English |
|---|---|
| Article number | 085206 |
| Number of pages | 5 |
| Journal | Physical Review. B: Condensed Matter and Materials Physics |
| Volume | 74 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug-2006 |
Keywords
- DONOR-ACCEPTOR HETEROJUNCTIONS
- PHOTOINDUCED ELECTRON-TRANSFER
- CONJUGATED POLYMERS
- ENERGY-TRANSFER
- FILM MORPHOLOGY
- CHAIN
- LUMINESCENCE
- TIME
- FEMTOSECOND
- COMPOSITES