Optical Materials Express · 2014 · 71 citations · 20 references
Natural SciencesElectrical EngineeringMaterials ScienceOptical MaterialsOptoelectronicsPhotonicsLight-emitting DiodesLuminescent MaterialsOptoelectronic DevicesOptoelectronic MaterialsQuantum DotsSemiconductor NanomaterialsColor GamutColor-conversion MaterialsElectroluminescent MaterialsGreen Light-emitting DiodesLuminescent NanomaterialsLuminous TransmittanceQuantum Dot DevicesWhite Light-emitting Diodes
This work reported on synthesis of highly efficient, color-pure green- and red-emitting non-Cd InP/ZnS core/shell quantum dots (QDs) and their utilization as color converters for the fabrication of display backlighting QD-based white light-emitting diode (LED). Green and red QD emitters were first individually embedded into a transparent polymeric matrix of polyvinylpyrrolidone and the resulting two free-standing QD composite plates were then physically combined into a bilayered form. White QD-LED was fabricated by remotely loading the bilayered QD plate of a red-on-green configuration onto blue LED chip. This remote-type white device generated a spectrally well-resolved, tricolored electroluminescent spectrum, and exhibited luminous efficacies of 8.9−16.7 lm/W, depending on forward currents of 20−100 mA, and a high color gamut of 87%.
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