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Doubling Coupling-Out Efficiency in Organic Light-Emitting Devices Using a Thin Silica Aerogel Layer
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2001
Year
Coupling-out EfficiencyEngineeringOrganic ElectronicsLuminescent GlassAerogel Spacer LayerOptical PropertiesLight-emitting DiodesPhotopolymer NetworkMaterials SciencePhotonicsPerfect DecouplingOrganic SemiconductorNew Lighting TechnologyGlass SubstrateOrganic Light-emitting DevicesWhite OledSolid-state LightingApplied PhysicsConjugated PolymerOptoelectronics
An innovative way of enhancing the coupling-out efficiency in light-emitting diodes (LEDs) is revealed. A very low-refractive-index silica aerogel is placed between the substrate and the emissive layer to obtain a perfect decoupling of the propagation modes within the emissive layer from the glass substrate. The Figure shows an ultrathin emissive layer on a glass substrate with (left) and without (right) an aerogel spacer layer under UV irradiation (see also cover).