Remote-type, high-color gamut white light-emitting diode based on InP quantum dot color converters

Abstract

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%. (C) 2014 Optical Society of America