Substrate-fluorescent LED
First Claim
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1. A substrate-fluorescent LED comprising:
- a semiconductor or insulator substrate doped with dopants absorbing light and producing fluorescence as fluorescence centers; and
an epitaxial emission structure including an active layer emitting light by electron band gap transition induced by current injection;
wherein white color or neutral colors of purple, redpurple, pink, yellow or orange are synthesized by mixing the light from the active layer with the fluorescence from the substrate.
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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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20 Claims
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1. A substrate-fluorescent LED comprising:
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a semiconductor or insulator substrate doped with dopants absorbing light and producing fluorescence as fluorescence centers; and
an epitaxial emission structure including an active layer emitting light by electron band gap transition induced by current injection;
wherein white color or neutral colors of purple, redpurple, pink, yellow or orange are synthesized by mixing the light from the active layer with the fluorescence from the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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