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Deposition Sciences Inc. - Difficult Coatings - LB - 8/23

‘Egg Crate’ Design for QD-LEDs Optimizes Performance

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CAMBRIDGE, Mass., Nov. 16, 2011 — A new quantum-dot LED "egg crate" design is turning troublesome ligand molecules into a critical element that creates a more versatile QD-LED structure that could have applications in displays, lighting, and lasers. QDs are tiny crystals that glow with bright, rich colors when stimulated by an electric current. Ligands — organic molecules that dangle from quantum dots — are essential to QD growth, but can interfere with current conduction and cause functional problems later on. Harvard researchers have demonstrated a new design for LEDs by nestling quantum dots in an...Read full article

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    Published: November 2011
    Glossary
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
    ALDaluminum oxide insulationAmericasatomic layer depositionBasic Scienceceramic electrodesConsumercurrent conductionDisplaysEdward Likovichegg crateegg-crate structureelectrode surfaceenergyHarvard School of Engineering and Applied SciencesHarvard’s Office of Technology Developmenthydrophobic ligandshydrophobic moleculesKasey RussellligandsLight SourcesLightsMassachusettsnanoQD-LEDqdsquantum dotsRafael JaramilloResearch & TechnologySEASsolar cellsTV displaysLasersLEDs

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