White LED

White LED

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Credit: GIPHOTOSTOCK/SCIENCE PHOTO LIBRARY

Caption: A white LED. A light-emitting diode (LED) is based on a forward-biased heterojunction and emits narrow-band radiation whose wavelength is determined by the bandgap of the semiconductor material. Recently-developed white LEDs are typically based on blue LEDs (InGaN, indium gallium nitride) coated with doped YAG (yttrium aluminum garnet) crystals which act as a phosphor, down-converting part of the blue radiation to a broad spectrum centered in the yellow. To the human eye the resulting spectral mix has an appearance of white light. (Aug 2007)

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Keywords: beam, bright, broadband, component, diode, electrical, electronics, emission, emit, hardware, hi, high, indium gallium nitride, ingan, intensity, led, light, light emitting diode, optical, optics, photonics, physics, power, science, scientific, semiconductor, source, spectrum, tech, technical, technology, visible, wavelength, white, yag, yttrium aluminum garnet

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