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White color light emitting device

  • US 20030218180A1
  • Filed: 05/06/2003
  • Published: 11/27/2003
  • Est. Priority Date: 05/15/2002
  • Status: Active Grant
First Claim
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1. A white color light emitting device comprising:

  • an InGaN-type LED emitting 340 nm-400 nm ultraviolet rays;

    a first fluorescence plate of ZnS doped with more than 1×

    1017 cm

    3
    Al, In, Ga, Cl, Br or I for converting the ultraviolet rays into blue light; and

    a second fluorescence plate of ZnS Se 1-x or ZnSe doped with more than 1×

    1017 cm

    3
    Al, In, Ga, Cl, Br or I for converting the blue light into yellow light and synthesizing white color light by mixing the blue light emitted from the first fluorescence plate with the yellow light emitted from the second fluorescence plate.

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