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Optical emission of conjugated polymers adsorbed to nanoporous alumina

TitleOptical emission of conjugated polymers adsorbed to nanoporous alumina
Publication TypeJournal Article
Year of Publication2003
AuthorsQi, DF, Kwong, K, Rademacher, K, Wolf, MO, Young, JF
Date PublishedSEP

Composites of conjugated polymers poly(2-methoxy-5-(2'-ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV) and poly(2,3-diphenyl)phenylene vinylene) (DP-PPV) adsorbed to porous alumina (PA) membranes have been prepared. Time-integrated and time-resolved optical emission properties of these materials at 77 K have been studied and compared with those of bulk thin films of these polymers. Observed blue shifts of the PL spectra (0.034-0.183 eV) for the PA-adsorbed polymers as compared to the bulk are attributed to the isolation of the polymer chains on the PA surface. The energy dependences of the fast decay rates measured on the blue side of the no-phonon emission peak in bulk and PA-adsorbed DP-PPV are very similar to each other. These results suggest that the intrachain diffusion of electron-hole excitations, either in the bulk or adsorbed to porous alumina, is very similar.