White light emitting device and white light source module using the same

  • US 20080128735A1
  • Filed: 12/05/2007
  • Published: 06/05/2008
  • Est. Priority Date: 12/05/2006
  • Status: Active Grant
First Claim
Patent Images

1. A white light emitting device comprising:

  • a blue light emitting diode chip having a dominant wavelength of 443 to 455 nm;

    a red phosphor disposed around the blue light emitting diode chip, the red phosphor excited by the blue light emitting diode chip to emit red light; and

    a green phosphor disposed around the blue light emitting diode chip, the green phosphor excited by the blue light emitting diode chip to emit green light,wherein the red light emitted from the red phosphor has a color coordinate falling within a space defined by four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905) and (0.4794, 0.4633) based on the CIE 1931 chromaticity diagram, andthe green light emitted from the green phosphor has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316) and (0.2555, 0.5030) based on the CIE 1931 color chromaticity diagram.

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