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Blue-green and green phosphors for lighting applications

  • US 8,329,060 B2
  • Filed: 10/22/2008
  • Issued: 12/11/2012
  • Est. Priority Date: 10/22/2008
  • Status: Active Grant
First Claim
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1. A method for producing a phosphor, the method comprising:

  • providing amounts of oxygen-containing compounds of cerium, silicon, and at least one alkaline-earth metal selected from the group consisting of Sr, Ba, Ca, and combinations thereof;

    mixing together the oxygen-containing compounds with a fluoride containing compound to form a mixture; and

    then firing the mixture at a temperature between about 900°

    C. and about 1700°

    C. under a reducing atmosphere for a sufficient period of time to convert the mixture to a phosphor comprising a general formula of ((Sr1−

    z
    Mz)1−

    (x+w)
    AwCex)3(Al1−

    y
    Siy)O4+y+3(x−

    w)
    F1−

    y−

    3(x−

    w)
    , wherein 0<

    x≦

    0.10, 0<

    y≦

    0.5, 0≦

    z≦

    0.5, 0swsx, A is Li, Na, K, or any combinations thereof, M is Ca, Ba, or any combinations thereof; and

    light emitted by the phosphor is blue-green to green in color, having a peak emission wavelength between about 485 nm and about 540 nm, using a 405 nm excitation wavelength.

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