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2005-03-29 - Article/Dans un journal avec peer-review - Anglais - 7 page(s)

Ford T.A., Avilov I.V., Beljonne David , Greenham N.C., "Enhanced Triplet Exciton Generation in Polyfluorene Blends" in Physical Review. B : Condensed Matter, 71, 12, 125212-125218

  • Edition : American Institute of Physics, New York (NY)
  • Codes CREF : 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) Photoinduced absorption spectroscopy is used to study the intersystem crossing in a blend consisting of the fluorene-based conjugated polymers poly(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT) and poly(9,9'-dioctylfluorene-co-bis-N,N'-(4-butylphenyl)-bis-N,N'-phenyl-1,4-phenylene-diamine) (PFB). The intersystem crossing efficiency is found to be ~10 times higher in F8BT:PFB than in F8BT alone. We attribute this effect to enhanced increased intersystem crossing in the charge-separated states formed at the polymer/polymer heterojunctions in the blend. Applying an electric field dissociates these states and thus reduces the rate of triplet state formation. We also perform time-dependent density functional theory quantum chemical calculations to determine the T1?Tn absorption cross section and to estimate the triplet yield.

Identifiants :
  • DOI : 10.1103/PhysRevB.71.125212