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PHOSPHOR BASED ILLUMINATION SYSTEM HAVING A LONG PASS REFLECTOR AND METHOD OF MAKING SAME

  • US 20070274098A1
  • Filed: 08/14/2007
  • Published: 11/29/2007
  • Est. Priority Date: 06/30/2004
  • Status: Active Grant
First Claim
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1. An illumination system, comprising:

  • a light source that emits light comprising a first optical characteristic;

    a light guide comprising an output surface;

    an interference reflector positioned between the light source and the output surface of the light guide, wherein the interference reflector substantially transmits light comprising a second optical characteristic and substantially reflects light comprising the first optical characteristic; and

    emissive material positioned between the light source and the interference reflector, wherein the emissive material emits light comprising the second optical characteristic when illuminated light comprising the first optical characteristic; and

    an optical cavity optically coupled to the light source, wherein the optical cavity is configured to direct light comprising at least one of the first optical characteristic and second optical characteristic toward an input surface of the light guide.

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