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

TitleOptical studies of electric fields in poly(2-methoxy-5-ethyl(2(')-hexyloxy) para-phenylene vinylene) light-emitting diodes
Publication TypeJournal Article
Year of Publication1999
AuthorsGiebeler, C., Whitelegg S. A., Campbell A. J., Liess M., Martin S. J., Lane P. A., Bradley D. D. C., Webster G., and Burn P. L.
JournalApplied Physics Letters
Volume74
Issue24
Pagination3714–3716
Date Publishedjun
AbstractWe 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. (c) 1999 American Institute of Physics. [S0003-6951(99)01224-3].