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Mulazzi, E., Perego, R., Wery, J., Mihut, L., Lefrant, S. & Faulques, E. (2006) Evidence of temperature dependent charge migration on conjugated segments in poly-p-phenylene vinylene and single-walled carbon nanotubes composite films. J. Chem. Phys. 125 014703.
Added by: Florent Boucher (2016-05-12 13:21:37) |
| Type de référence: Article DOI: 10.1063/1.2212388 Numéro d'identification (ISBN etc.): 0021-9606 Clé BibTeX: Mulazzi2006 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: absorption, optical-properties, photoluminescence, poly(p-phenylenevinylene), poly(para-phenylene vinylene), ppv, spectra Créateurs: Faulques, Lefrant, Mihut, Mulazzi, Perego, Wery Collection: J. Chem. Phys. |
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| Résumé |
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We present new results of temperature dependence of photoluminescence spectra carried out on poly-p-phenylene vinylene (PPV) and on PPV composite films with single-walled carbon nanotubes. By performing studies at different temperatures (87 and 300 K), we show that a distribution of conjugated PPV segments is needed to interpret experimental data. At the microscopic scale, such a distribution corresponds to the morphological picture of poorly packed short chain segments and well-packed ordered long chain segments. Within this scheme, a new interpretation emerges for explaining the specific behavior of the photoluminescence bands. In particular, the two most intense components of the photoluminescence spectra of PPV thermally converted at 300 degrees C (2.23 and 2.43 eV at 300 K) change drastically their relative intensity when the observation temperature decreases. This effect is interpreted as due to the inhibition of charge migration to longer segments and to radiative recombination occurring mainly on n=5 conjugated segments.
Added by: Florent Boucher |