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White color light emitting diode and neutral color light emitting diode

  • US 6,337,536 B1
  • Filed: 06/21/1999
  • Issued: 01/08/2002
  • Est. Priority Date: 07/09/1998
  • Status: Expired due to Fees
First Claim
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1. A white color LED comprising:

  • an n-type ZnSe single crystal substrate doped with iodine (I), bromine (Br), chlorine (Cl), gallium (Ga), indium (In) or aluminum (Al) which acts both as an n-type dopant and as a self-activated (SA) emission center which absorbs blue or bluegreen light and makes yellow or orange light; and

    an epitaxial film structure epitaxially grown on the ZnSe substrate, the epitaxial film structure having a pn-junction and an active layer made of a ZnSe crystal or a ZnSe-related compound crystal for emitting blue light or bluegreen light;

    wherein the ZnSe substrate produces and emits white light by mixing the light from the epitaxial film structure with the light from the SA-emission centers.

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