Excitation energy migration in pi-conjugated polymers

Excitation energy migration (EEM) in conjugated polymers is probed by dopin g the blue light emitting ladder-type poly(p-phenylene) with small amounts of a highly fluorescent pi -conjugated macromolecule. The experimentally at tained results for photoluminescence are modeled and discussed by means of a two step EEM process: (1) migration within the host and (2) transfer from the host to the guest. In particular we show that a Forster type mechanism alone cannot account for the experimental facts in such a guest host syste m.