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Light emitting device

  • US 8,610,145 B2
  • Filed: 09/29/2004
  • Issued: 12/17/2013
  • Est. Priority Date: 09/30/2003
  • Status: Active Grant
First Claim
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1. A white-light emitting apparatus comprising:

  • a co-fired aluminum nitride substrate; and

    a light emitting device arranged on a front surface of the co-fired aluminum nitride substrate,wherein the front surface of the co-fired aluminum nitride substrate, on which the light emitting device is arranged, is mirror-polished so as to have a surface roughness of 0.3 μ

    m Ra or less,wherein the light emitting apparatus comprises a vapor-deposited metal film and via holes, the vapor-deposited metal film being arranged directly on the front surface of the co-fired aluminum nitride substrate around the light emitting device and having a reflectivity of 90% or more with respect to light emitted from the light emitting device, and the via holes penetrating the co-fired aluminum nitride substrate from the front surface, on which the light emitting device is arranged, to the rear surface of the co-fired aluminum nitride substrate to thereby allow an electrical conduction to the light emitting device from the rear surface to the front surface without using a wire-bonding,wherein the vapor-deposited metal film comprises aluminum or silver and has a thickness of 1 to 5 μ

    m, andwherein the co-fired aluminum nitride substrate has a thickness of 0.3 to 0.6 mm.

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