Optical studies of electric fields in poly(2-methoxy-5-ethyl (2′-hexyloxy) para-phenylene vinylene) light-emitting diodes

C. Giebeler, S. A. Whitelegg, A. J. Campbell, M. Liess, S. J. Martin, P. A. Lane, D. D.C. Bradley, G. Webster, P. L. Burn

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We report electroabsorption studies of poly(2-methoxy-5-ethyl(2′-hexyloxy) para-phenylene vinylene) light-emitting diodes. An electric field develops during operation which opposes the field of the applied bias. The counter field builds up within 5 s of turning on the device, increases in magnitude with the operating voltage, and decays exponentially with a time constant between 15 and 32 s. We attribute the counter field to bulk carrier traps and discuss its relevance to the increase of the turn-on voltage as organic light-emitting diodes degrade. © 1999 American Institute of Physics.
Original languageEnglish (US)
JournalApplied Physics Letters
Issue number24
StatePublished - Jun 14 1999
Externally publishedYes

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