Avilov, Igor

Beljonne, D.

Ford, T.A.

Greenham, N.C.

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

Enhanced triplet exciton generation in polyfluorene blends.

Abstract

Similar works

Full text

Available Versions

Repository of the University of Namur

Repository of the University of Namur