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Phosphor systems for a white light emitting diode (LED)

  • US 7,267,787 B2
  • Filed: 08/04/2004
  • Issued: 09/11/2007
  • Est. Priority Date: 08/04/2004
  • Status: Active Grant
First Claim
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1. A white LED comprising:

  • a radiation source configured to emit radiation having a wavelength ranging from about 250 to 420 nm;

    a yellow phosphor configured to absorb at least a portion of the radiation from the radiation source and emit light with peak intensity in a wavelength ranging from about 530 to 590 nm, wherein the yellow phosphor has the formula A2SiO4;

    Eu2+F and A is at least one of a divalent metal selected from the group consisting of Sr, Ca, Ba, Mg, Zn, and Cd, and wherein the fluorine dopant substitutes for oxygen; and

    a blue phosphor configured to absorb at least a portion of the radiation from the radiation source and emit light with peak intensity in a wavelength ranging from about 470 to 530 nm.

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