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Nitride phosphor and production process thereof, and light emitting device

  • US 8,076,847 B2
  • Filed: 05/15/2009
  • Issued: 12/13/2011
  • Est. Priority Date: 03/22/2002
  • Status: Expired due to Fees
First Claim
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1. A light emitting device comprising:

  • a package having a first concave portion and a second concave portion, the first concave portion being bored on a bottom of the second concave portion in an inner direction opposite to a direction toward the face of observing luminescence to form a step on the bottom of the second concave portion;

    light sources comprising a first light source mounted in the first concave portion and a second light source mounted in the second concave portion;

    a first phosphor layer disposed in the first concave portion the first phosphor layer absorbing at least a portion of a light emitted from the first light source and emitting a first light having a wavelength longer than the light emitted from the first light source;

    a second phosphor layer which absorbs at least a portion of a light emitted from the first light source and the light emitted from the second light source and which emits a second light having a wavelength longer than the light emitted from the second light source;

    wherein a peak wavelength of the first light is longer than a peak wavelength of the second light, and whereinthe first light emitted from the first phosphor is diffused by the second phosphor without being absorbed.

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