TY - JOUR
T1 - Enhanced triplet exciton generation in polyfluorene blends
AU - Ford, T.A.
AU - Avilov, Igor
AU - Beljonne, D.
AU - Greenham, N.C.
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevB.71.125212
DO - 10.1103/PhysRevB.71.125212
M3 - Article
SN - 1098-0121
VL - 71
JO - Physical Review. B, Condensed Matter and Materials Physics
JF - Physical Review. B, Condensed Matter and Materials Physics
IS - 12
ER -