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Optical semiconductor device

  • US 7,808,007 B2
  • Filed: 05/29/2008
  • Issued: 10/05/2010
  • Est. Priority Date: 05/29/2007
  • Status: Active Grant
First Claim
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1. An optical semiconductor device comprising:

  • a container having a depression to reflect light, the depression having an opening, a bottom and a side surface;

    a semiconductor light-emitting element placed in the depression to emit light;

    a first fluorescent material layer located in the depression, at least a portion of the first fluorescent material layer being provided between the opening of the depression and the semiconductor light-emitting element, and the first fluorescent material layer being excited by the light emitted from the semiconductor light-emitting element to emit light having a first wavelength longer than an light-emission wavelength of the semiconductor light-emitting element; and

    a second fluorescent material layer having first and second portions, the first portion being provided between the bottom of the depression and the semiconductor light-emitting element and located in the depression, the second portion provided between the side surface of the depression and the semiconductor light-emitting element and located in the depression, the second fluorescent material layer being excited by the light emitted from the semiconductor light-emitting element to emit light having a second wavelength longer than the first wavelength.

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