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Time-Resolved Transport of Electrons and Holes in Conjugated Polymers

Published online by Cambridge University Press:  10 February 2011

D. Pinner ,
R. H. Friend  and
N. Tessler
D. Pinner
Affiliation:
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, UK
R. H. Friend
Affiliation:
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, UK
N. Tessler
Affiliation:
Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, UK
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Abstract

Detailed experimental and theoretical analysis of the pulsed excitation of polymer light emitting diodes is presented. We find a set of universal transient features for different device configurations which can be reproduced using our phenomenological numerical model. We find that the temporal evolution of the electroluminescence can be characterised by five main features: i) a delay followed by; ii) fast initial rise at turn-on followed by; iii) a slow rise (slower by at least one order of magnitude); iv) fast modulation (<15ns, unresolved) at turn-off followed by v) a long-lived exponential tail. We suggest a method for extracting mobility values which is found to be compatible with CW drive schemes. Mobilities for holes and electrons are extracted for a poly(p-phenylenevinylene) co-polymer and poly(di-octyl fluorene).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 561: Symposium F – Organic Nonlinear Optical Materials and Devices , 1999 , 143
Copyright
Copyright © Materials Research Society 1999

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References

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