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Optically and Electrically Excited Semiconducting polymer Structures

Published online by Cambridge University Press:  10 February 2011

H. Becker,
S. E. Burns,
G. J. Denton,
N. T. Harrison,
N. Tessler,
T. D. Wilkinson and
R. H. Friend
H. Becker
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, rhf10@cam.ac.uk
S. E. Burns
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, rhf10@cam.ac.uk
G. J. Denton
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, rhf10@cam.ac.uk
N. T. Harrison
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, rhf10@cam.ac.uk
N. Tessler
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, rhf10@cam.ac.uk
T. D. Wilkinson
Affiliation:
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
R. H. Friend
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, UK, rhf10@cam.ac.uk
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Abstract

We report recent advances in the development of conjugated polymer device structures. We have fabricated vertical microcavity structures in which the optical path distance is tunable through control of the orientation of a liquid crystal layer, and demonstrate cavity tuning over 59 nm. We show that this structure allows convenient matching of cavity modes to the freespace emission spectrum from poly(r henylene vinylene), PPV. We have investigated the operation of electrically-excited polymer LEDs with short pulse operation, and have achieved current densities above 103 A/cm2 and peak brightnesses of up to 5 × 106 cd/m 2. We have measured the optical absorption due to the injected carriers under these drive conditions, and find an absorption band near 1.6 eV which we attribute to the presence of polarons. This allows measurement of the injected charge density, from which we deduce that carrier mobilities are strongly enhanced at high fields, reaching values of 4 x 10−2 cm2/Vsec for PPV diodes.

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