Excitation migration along oligophenylenevinylene-based chiral stacks: delocalization effects on transport dynamics.

Beljonne, D; Hennebicq, E; Daniel, C; Herz, L M; Silva, C; Scholes, G D; Hoeben, F J M; Jonkheijm, P; Schenning, A P H J; Meskers, S C J; Phillips, R T; Friend, R H; Meijer, E W

Beljonne, D; Hennebicq, E; Daniel, C; Herz, L M; Silva, C; Scholes, G D; Hoeben, F J M; Jonkheijm, P; Schenning, A P H J; Meskers, S C J; Phillips, R T; Friend, R H; Meijer, E W.

Afiliación

Beljonne D; Laboratory of Chemistry of Novel Materials, University of Mons-Hainaut, Place du Parc 20, 7000 Mons, Belgium. David@averell.umh.ac.be

J Phys Chem B ; 109(21): 10594-604, 2005 Jun 02.

Article en En | MEDLINE | ID: mdl-16852286

RESUMEN

Atomistic models based on quantum-chemical calculations are combined with time-resolved spectroscopic investigations to explore the migration of electronic excitations along oligophenylenevinylene-based chiral stacks. It is found that the usual Pauli master equation (PME) approach relying on uncoherent transport between individual chromophores underestimates the excitation diffusion dynamics, monitored here by the time decay of the transient polarization anisotropy. A better agreement to experiment is achieved when accounting for excitation delocalization among acceptor molecules, as implemented in a modified version of the PME model. The same models are applied to study light harvesting and trapping in guest-host systems built from oligomers of different lengths.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Chem B Asunto de la revista: QUIMICA Año: 2005 Tipo del documento: Article País de afiliación: Bélgica Pais de publicación: Estados Unidos

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