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LED with particles in encapsulant for increased light extraction and non-yellow off-state color

  • US 7,791,093 B2
  • Filed: 09/04/2007
  • Issued: 09/07/2010
  • Est. Priority Date: 09/04/2007
  • Status: Active Grant
First Claim
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1. A light emitting device comprising:

  • a semiconductor light emitting diode (LED);

    a layer of phosphor over the LED; and

    an encapsulant over the LED and phosphor directly contacting the phosphor, the encapsulant comprising a substantially transparent material containing only inert non-phosphor, the particles being between 0.5%-5% by weight of the encapsulant, the particles having a substantially white color under white ambient lightan average diameter of the particles is less than one micron.

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