Light source using semiconductor devices mounted on a heat sink

  • US 20030039122A1
  • Filed: 08/24/2001
  • Published: 02/27/2003
  • Est. Priority Date: 08/24/2001
  • Status: Active Grant
First Claim
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1. A semiconductor light source for emitting light to illuminate a space used by humans, the semiconductor light source comprising:

  • an enclosure, said enclosure being fabricated from a material substantially transparent to white light, a base to which said enclosure is mounted, an interior volume within said enclosure, a secondary heat sink located in said interior volume, said secondary heat sink being capable of drawing heat from one or more semiconductors devices, a plurality of primary heat sinks mounted on said secondary heat sink, each of said primary heat sinks being smaller than said secondary heat sink, a semiconductor chip capable of emitting light mounted on one of said primary heat sinks, said semiconductor chip being capable of emitting monochromatic light, said semiconductor chip being selected from the group consisting of light emitting diodes, light emitting diode arrays, laser chips, and VCSEL chips, said chip including a substrate on which epitaxial layers are grown, a buffer layer located on said substrate, said buffer layer serving to mitigate differences in material properties between said substrate and other epitaxial layers, a first cladding layer serving to confine electron movement within the chip, said first cladding layer being adjacent said buffer layer, an active layer, said active layer emitting light when electrons jump to a valance state, a second cladding layer, said second cladding layer positioned so that said active layer lies between cladding layers, and a contact layer on which an electron may be mounted for powering said chip, and a coating for converting monochromatic light emitted by said chip to white light.

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