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Highly Efficient Light-Emitting Diodes Based on an Organic-Soluble Poly(p-phenylenevinylene) Derivative Carrying the Electron-Transporting PBD Moiety
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1998
Year
EngineeringOrganic ElectronicsResponsive PolymersOptoelectronic DevicesChemistryLuminescence PropertyEl EfficiencyElectronic DevicesElectron-transporting Pbd MoietyPhotodetectorsLight-emitting DiodesPolymer ChemistryElectrical EngineeringOptoelectronic MaterialsEfficient ElectroluminescenceOrganic-soluble PolyOrganic Charge-transfer CompoundWhite OledElectronic MaterialsSemiconducting PolymerApplied PhysicsBalanced Charge InjectionConjugated PolymerOptoelectronics
Balanced charge injection and mobility are required for efficient electroluminescence (EL) in light-emitting diodes (LEDs). Here a novel approach towards this end is described—the direct attachment of the electron transporting material 2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD) to the backbone of poly(p-phenylenevinylene) (PPV). The fabrication and performance efficiency of devices based on this polymer are reported. It is found that the EL efficiency is improved to a remarkable extent, which is ascribed to a more facile electron injection and an enhancement of the electron transporting properties of the polymer.