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White light emitting phosphor blends for LED devices

  • US 6,939,481 B2
  • Filed: 07/11/2003
  • Issued: 09/06/2005
  • Est. Priority Date: 05/15/2000
  • Status: Expired due to Term
First Claim
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1. A white light emitting phosphor blend comprising at least three phosphors, wherein the white light emitted by the phosphor blend in response to incident radiation having a peak wavelength between 360 and 420 nm comprises a color temperature between 3000K and 6500K, a CRI above 70 and an efficacy above 200 lm/W;

  • wherein the efficacy is above 264 lm/W and the color temperature is between 3300K and 4100K for incident radiation having a peak wavelength between 370 and 405 nm; and

    wherein the phosphor blend comprises;

    about 55 to about 75 weight percent Sr2P2O7;

    Eu2+, Mn2+ phoshor;

    about 11 to about 22 weight percent of at least one of (Ba,Sr,Ca)2SiO4;

    Eu2+ phosphor; and

    about 13 to about 22 weight percent of at least one of (Sr,Ba,Ca,Mg)5(PO4)3Cl;

    Eu2+ phosphor.

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