Applied Physics Letters · 2005 · 65 citations · 19 references
EngineeringOptoelectronic DevicesElectronic DevicesPhotodetectorsLight-emitting DiodesPolymer ChemistryEthylene OxideMaterials ScienceElectrical EngineeringPolymer Light-emitting DiodesOptoelectronic MaterialsNew Lighting TechnologyAl CathodeMeh-ppv PledsWhite OledSolid-state LightingElectronic MaterialsSemiconducting PolymerApplied PhysicsConjugated PolymerOptoelectronics
We report an increase of electroluminescence (EL) efficiency by two orders of magnitude for poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) based polymer light-emitting diodes (PLED) while employing Al as the cathode with an ultrathin layer of poly(ethylene oxide) (PEO). EL efficiencies of MEH-PPV PLEDs biased at 10 mA were found to be 0.017cd∕A at 31cd∕m2, 1.50cd∕A at 2515cd∕m2, and 4.96cd∕A at 8416cd∕m2 for applying Al, PEO∕Al, and PEO∕LiF∕Al as the device cathodes, respectively. The significant improvement in the device performance is attributed to the promotion of minority carrier injection (electrons), where the threshold of the injection can be characterized through the deviation of Fowler–Nordhiem tunneling prediction.
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Organic electroluminescent diodes
Chak Wah Tang, S. A. VanSlyke · Applied Physics Letters · 1987 · 14.1K citations
Light-emitting diodes based on conjugated polymers
J. H. Burroughes, Donal D. C. Bradley, Adam R. Brown et al. · Nature · 1990 · 11.3K citations