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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Direct observation of intersystem crossing in charge-pair states in polyfluorene polymer blends
Chemical Physics Letters, Volume 454, No. 4-6, Year 2008
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Description
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 × 106 s-1. © 2008 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Ford, Thomas Anthony
United Kingdom, Cambridge
University of Cambridge
Durrant, James R.
United Kingdom, London
Imperial College London
Statistics
Citations: 31
Authors: 2
Affiliations: 3
Identifiers
Doi:
10.1016/j.cplett.2008.02.021
ISSN:
00092614