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2005-06-02 - Article/Dans un journal avec peer-review - Anglais - 11 page(s)

Beljonne David , 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., "Excitation Migration along Oligophenylenevinylene-based Chiral Stacks: Delocalization Effects on Transport Dynamics" in Journal of Physical Chemistry B, 109, 21, 10594-10604

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : Physique de l'état condense [struct., électronique, etc.] (DI1266), Spectroscopie [électromagnétisme, optique, acoustique] (DI1255)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) 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.

Notes :
  • (Anglais) Publié en ligne le 6 mais 2005
Identifiants :
  • DOI : 10.1021/jp050792p