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Light emitting device having a divalent-europium-activated alkaline earth metal orthosilicate phosphor

  • US 7,157,746 B2
  • Filed: 09/30/2004
  • Issued: 01/02/2007
  • Est. Priority Date: 12/28/2000
  • Status: Expired due to Term
First Claim
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1. A light emitting device, comprising:

  • a light emitting element comprising a nitride semiconductor; and

    a phosphor which can absorb a part of light emitted from said light emitting element and can emit light of a wavelength different from that of said absorbed light,wherein the phosphor comprises at least one of divalent-europium-activated alkaline earth metal orthosilicates represented by a formula;


    (Sr(1-x-y)BaxCay)2(Si(1-α







    )
    Pα

    Alβ

    Bγ

    Geδ

    )O4;

    Eu2+

    where 0<

    x≦

    0.8, 0≦

    y<

    0.8, 0<

    x+y<

    1, 0≦

    α

    , β

    , γ

    <

    0.25, 0≦

    δ

    <

    0.5, 0≦

    α







    <

    1.

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