Electronic states in conjugated polymers probed by excimers

摘要

We synthesized an oligomer of O-PPV poly(2,5-diphenylene-1,3,4-oxadiazolyle-4,4'-vinylene) with 4 repeat units. As oxadiazole in the PPV main chain is an acceptor, intermolecular interaction of O-PPV will increase and even produce a charge-transfer complex (excimer) in solid-stare. So we may obtain the information of electronic structures on conjugated polymers by detecting the PL characteristics of excimers. The absorption, excitation and photoluminescence spectra were measured on pristine O-PPV and O-PPV/PEO poly(ethyleneoxide). The results indicate that the strength of the interchain charge-transfer is related to the property of excited states. We think that there are two different processes of photoexcitation transitions in conjugated polymers. (C) 2000 Elsevier Science B.V. All rights reserved. References: 17