Substrate-fluorescent LED
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United States of America Patent
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Jan 21, 2003
Grant Date -
N/A
app pub date -
Jul 12, 1999
filing date -
Jul 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A substrate-fluorescent LED having a fluorescent-impurity doped substrate and an epitaxial emission structure including an active layer and being made on the substrate. The epitaxial emission structure emits blue or green light corresponding to the band gap of the active layer. The substrate absorbs a part of the blue or green light and makes fluorescence of a longer wavelength. Neutral color light or white light is emitted from the LED. The fluorescent substrate is n-AlGaAs(Si dope), GaP(Zn+O dope), ZnSe(Cu+I, Ag+I, Al+I dope), GaN(O.C.Va(N) dope) or so.
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