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Proceedings Paper

Field screening effects in polymer light emitting diodes
Author(s): Paul J. Brewer; Paul A. Lane; Donal D. C. Bradley; Andrew J. deMello; John C. deMello
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Paper Abstract

We use electromodulation (EM) spectroscopy to probe the electric field distribution in polymer light-emitting diodes. The EM spectrum below the turn-on bias is dominated by electroabsorption of the emissive layer but vanishes completely above the turn-on bias. The EM spectrum above turn-on is due entirely to absorption and bleaching effects arising from injected charge. The total elimination of the electroabsorption signal indicates that the internal electric field is effectively screened by the injected charge, and this effect is attributed to accumulation of trapped electrons close to the anode.

Paper Details

Date Published: 8 September 2004
PDF: 8 pages
Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.546904
Show Author Affiliations
Paul J. Brewer, Imperial College London (United Kingdom)
Paul A. Lane, Naval Research Lab. (United States)
Donal D. C. Bradley, Imperial College London (United Kingdom)
Andrew J. deMello, Imperial College London (United Kingdom)
John C. deMello, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 5464:
Organic Optoelectronics and Photonics
Paul L. Heremans; Michele Muccini; Hans Hofstraat, Editor(s)

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