Epitaxial wafer for AlGaInP light-emitting diode
First Claim
1. An epitaxial wafer for an AlGaInP light-emitting diode, comprising:
- a p-type GaAs substrate,a reflection layer comprised of a lamination of multiple semiconductor layers provided over the substrate,a double hetero-junction light-emitting structure of AlGaInP provided over the reflection layer, said light-emitting structure being comprised of an active layer between upper and lower cladding layers,a current diffusion layer of n-type AlGaAs provided over the double hetero-junction light-emitting structure, said current diffusion layer being transparent to light emitted by the light-emitting structure and having a carrier concentration of not less than 1017 cm-3 and a thickness of not more than 1 μ
m, anda protective layer provided over the current diffusion layer, said protective layer being transparent to light emitted by the light-emitting structure and having a thickness up to 0.5 μ
m.
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Accused Products
Abstract
An epitaxial wafer for an AlGaInP light-emitting device includes a p-type GaAs substrate, a reflection layer in the form of a laminated body of multiple semiconductor layers provided over the substrate, a double hetero-junction light-emitting structure of AlGaInP formed over the reflection layer, the light-emitting structure including an active layer between upper and lower cladding layers, and a current diffusion layer of AlGaAs provided over the double hetero-junction light-emitting structure. The current diffusion layer is transparent to light emitted by the light-emitting structure. The current diffusion layer is n-type AlGaAs, and has a carrier concentration of from 1017 cm-3 to 2×1019 cm-3, and a thickness that is not more than 1 μm.
41 Citations
16 Claims
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1. An epitaxial wafer for an AlGaInP light-emitting diode, comprising:
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a p-type GaAs substrate, a reflection layer comprised of a lamination of multiple semiconductor layers provided over the substrate, a double hetero-junction light-emitting structure of AlGaInP provided over the reflection layer, said light-emitting structure being comprised of an active layer between upper and lower cladding layers, a current diffusion layer of n-type AlGaAs provided over the double hetero-junction light-emitting structure, said current diffusion layer being transparent to light emitted by the light-emitting structure and having a carrier concentration of not less than 1017 cm-3 and a thickness of not more than 1 μ
m, anda protective layer provided over the current diffusion layer, said protective layer being transparent to light emitted by the light-emitting structure and having a thickness up to 0.5 μ
m. - View Dependent Claims (2, 3, 4, 5, 11, 12, 13)
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6. An AlGaInP light-emitting diode, comprising:
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a p-type GaAs substrate, a p-type ohmic electrode provided on a back surface of the substrate, a reflection layer comprised of a lamination of multiple semiconductor layers provided over the substrate, a double-hetero-junction light-emitting structure of AlGaInP provided over the reflection layer, said light-emitting structure being comprised of an active layer between upper and lower cladding layers, a current diffusion layer of n-type AlGaAs provided over the double hetero-junction light-emitting structure, said current diffusion layer being transparent to light emitted by the light-emitting structure and having a carrier concentration of not less than 1017 cm-3 and not more than 2×
1019 cm-3 and a thickness of not more than 1 μ
m,a protective layer provided over the current diffusion layer, said protective layer being transparent to light emitted by the light-emitting structure and having a thickness up to 0.5 μ
m, andan n-type ohmic electrode provided on the AlGaAs current diffusion layer. - View Dependent Claims (7, 8, 9, 10, 14, 15, 16)
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Specification