ULTRAFAST ENERGY-TRANSFER DYNAMICS IN A BLEND OF ELECTROLUMINESCENT CONJUGATED POLYMERS

Femtosecond pump-probe spectroscopy was applied to a guest-host system of conjugated polymers, the blue-emitting poly(para-phenylene) (m-LPP P) and the red-emitting poly(perylene-co-diethynylbenzene) (PPDB). Exc itation energy transfer between m-LPPP and PPDB, monitored by the form ation of the PPDB photobleaching band at 2.15 eV, takes place on a pic osecond timescale. The non-exponential kinetics of the excitation ener gy transfer and its dependence on the acceptor (PPDB) concentration pr ovide clear evidence for a Forster-type energy transfer. (C) 1998 publ ished by Elsevier Science B.V. All rights reserved.