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Role of Electrode Contamination in Electron Injection at Mg:Ag/Alq3 Interfaces
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1999
Year
EngineeringElectrode-electrolyte InterfaceOrganic ElectronicsOptoelectronic DevicesWater VaporElectrode ContaminationAsymmetric Injection BehaviorElectronic DevicesCorrosionElectrochemical InterfaceElectrode Reaction MechanismMaterials ScienceMaterials EngineeringElectrical EngineeringSurface ElectrochemistryOptoelectronic MaterialsNew Lighting TechnologyStrict Vacuum ConditionsElectrochemistryWhite OledSolid-state LightingSurface ScienceApplied PhysicsOptoelectronicsElectrochemical Surface Science
The environment in which organic light-emitting diodes (OLEDs) are fabricated can profoundly affect device performance, as shown here. The previously reported asymmetric injection behavior of Mg:Ag/Alq3/Mg:Ag structures (where Alq3 is tris(8-hydroxyquinoline) aluminum) is investigated by fabricating and testing these structures under ultra-high vacuum with and without exposing the bottom electrode to oxygen and water vapor. It is demonstrated that devices fabricated under strict vacuum conditions exhibit symmetric I–V characteristics while those exposed to air do not.