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Increased Efficiency and Controlled Light Output from a Microstructured Light-Emitting Diode
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2001
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Optical MaterialsEngineeringControlled Light OutputResponsive PolymersMicro-optical ComponentPolymer Light-emitting DiodePolymersOptical PropertiesLight-emitting DiodesPhotopolymer NetworkMicrostructured Light-emitting DiodePolymer ChemistryPhotonicsElectrical EngineeringNew Lighting TechnologyLateral ModesLateral Wavelength-scale MicrostructurePhotonic DeviceWhite OledSolid-state LightingPolymer ScienceApplied PhysicsConjugated PolymerOptoelectronicsOptical Devices
The use of Bragg scattering to increase the efficiency and control the spectrum and polarization of light from a polymer light-emitting diode (LED) is demonstrated. A lateral wavelength-scale microstructure in the form of a corrugation is integrated into the light-emitting layer and used to control the lateral modes (those parallel to the light-emitting layer) of the structure. Both photoluminescence and electroluminescence efficiencies can be enhanced in poly[2-Methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene] (MEH–PPV) based devices.