Applied Physics Letters · 2009 · 78 citations · 10 references
EngineeringMaterials EngineeringMaterials ScienceOptical MaterialsOptoelectronicsSemiconductor DevicesLight-emitting DiodesLuminescent MaterialsOptoelectronic DevicesOptoelectronic MaterialsOrganic Electronic MaterialsOrganic SemiconductorsBlue Light-emitting DiodesCurrent EfficiencyElectron Transport BlockadeOrganic ElectronicsOrganic Light-emitting DiodesPhosphorescent MaterialsQuantum EfficiencySimple Structure
High efficiency blue phosphorescent organic light emitting diodes have been developed by using a simple device structure. A derivative of spirobifluorene based phosphine oxide was used both as a host and an electron transport layer with an exciton blocking function. A maximum quantum efficiency of 19.2% and a current efficiency of 37.2cd∕A were obtained by using a simple device structure without a hole blocking layer.
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