Journal
CHEMICAL PHYSICS LETTERS
Volume 454, Issue 4-6, Pages 237-241Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2008.02.021
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In conjugated polymers, the process of interconversion between singlet and triplet bound charge-pairs is important in determining the efficiency limits both for light-emitting diodes (LEDs) and for photovoltaics. We probe the kinetics of spin-mixing in charge-pairs by studying the formation of triplet excitons after photoexcitation of blends of poly( 9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) with poly(9,9-dioctylfluorene-co-bis-N, N'-(4- butylphenyl)-bis-N,N'-phenyl-1,4-phenylene-diamine) (PFB) using excited-state transient absorption spectroscopy. We see clear evidence of triplet formation from long-lived charge-pairs during a period up to 100 ns after the excitation pulse, and we find that the intersystem crossing rate in these charge- pairs exceeds 2.0 x 10(-6) s(-1). (c) 2008 Elsevier B. V. All rights reserved.
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