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For better LEDs, two V’s could mean victory

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Hank Hogan, [email protected], Contributing Editor

For light-emitting diodes, a brighter, more efficient and groovier future may be at hand. The result could be billions of dollars of annual energy savings, say researchers from the National Institute of Advanced Industrial Science and Technology (AIST). Senior scientist Xue-Lun Wang and colleagues at AIST recently announced a technique that boosts LED efficiency by 50 percent or more. They achieved this by fabricating V-shaped ridges on the LED surface and covering them with a thin layer of silicon dioxide. Adding the oxide layer doesn’t require significant changes to current LED...Read full article

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    Published: August 2010
    Glossary
    chip
    1. A localized fracture at the end of a cleaved optical fiber or on a glass surface. 2. An integrated circuit.
    gallium nitride
    Gallium nitride (GaN) is a compound made up of gallium (Ga) and nitrogen (N). It is a wide-bandgap semiconductor material that exhibits unique electrical and optical properties. Gallium nitride is widely used in the production of various electronic and optoelectronic devices, including light-emitting diodes (LEDs), laser diodes, power electronics, and high-frequency communication devices. Key points about gallium nitride (GaN): Chemical composition: Gallium nitride is a binary compound...
    light-emitting diode
    An LED, or light emitting diode, is a semiconductor device that emits light when an electric current passes through it. LEDs are widely used in various applications due to their energy efficiency, compact size, and long operational life. The technology behind LEDs is based on the phenomenon of electroluminescence. Key characteristics and features of LEDs include: Electroluminescence: The process by which LEDs emit light is called electroluminescence. It involves the recombination of...
    reflection
    Return of radiation by a surface, without change in wavelength. The reflection may be specular, from a smooth surface; diffuse, from a rough surface or from within the specimen; or mixed, a combination of the two.
    silicon dioxide
    An abundant material found in the form of quartz and agate and as one of the major constituents of sand. The silicates of sodium, calcium, and other metals can be readily fused, and on cooling do not crystallize, but instead form the familiar transparent material glass.
    AISTAlGaInPaluminum gallium indium phosphidechipcoating layeremissionemitGaAsgallium nitrideGaNGreenLightHank HoganindustrialInterfaceLED surfacelight extractionLight Sourceslight-emitting diodeNational Institute of Advanced Industrial Science and Technologynear-infrared emitting gallium arsenideoxidereflectionridgessemiconductorssilicon dioxidesubstratev-shaped ridgesXue-Lun WangLEDs

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