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UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light

  • US 5,813,753 A
  • Filed: 05/27/1997
  • Issued: 09/29/1998
  • Est. Priority Date: 05/27/1997
  • Status: Expired due to Fees
First Claim
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1. A visible light emitting device comprising:

  • a supporting body having an upper surface with a depression having an opening in the upper surface;

    a UV and blue and visible light-reflecting layer on the surface of the depression;

    a UV and blue light emitting diode (UV and blue LED) centrally located on the light reflecting layer;

    the LED having an active region with a first index of refraction;

    particles of a visible light emitting phosphor surrounding the sides and top of the LED; and

    a UV and blue and visible light transmitting material surrounding the LED and filling the depression, the UV and blue and visible light transmitting material having a second index of refraction lower than the said first index of refraction.

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