White color light emitting diode and neutral color light emitting diode
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United States of America Patent
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Jan 8, 2002
Grant Date -
N/A
app pub date -
Jun 21, 1999
filing date -
Jul 9, 1998
priority date (Note) -
Expired
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Abstract
A white color or neutral color LED having an n-type ZnSe single crystal substrate doped with I, Cl, Br, Al, Ga or In as SA-emission centers and an epitaxial film structure including a ZnSe, ZnCdSe or ZnSeTe active layer and a pn-junction. The active layer emits blue or bluegreen light. The SA-emission centers in the ZnSe substrate convert blue or bluegreen light to yellow or orange SA-emission. The blue or bluegreen light from the epitaxial film structure and the yellow or orange light from the ZnSe substrate synthesize white color light or neutral color light between red and blue.
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