Semiconductor light emitting device
First Claim
1. A semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure portion formed on the substrate and consisting of an InGaAsP active layer and upper and lower clad layers having the active layer sandwiched therebetween, a first electrode formed on a part of the surface of the double hetero structure portion, and a second electrode formed on the surface of the substrate opposite to the double hetero structure portion, wherein the active layer is set to be of p-type having a carrier concentration of 1×
- 1017 cm-3 or less and has a thickness falling within a range of between 0.05 and 0.75 micron, and a current spreading layer is interposed between the double hetero structure portion and the first electrode.
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Accused Products
Abstract
Disclosed is a semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure portion formed on the front surface of the substrate and consisting of an InGaAlP active layer and lower and upper clad layers having the active layer sandwiched therebetween, a first electrode formed in a part of the surface of the double hetero structure portion, and a second electrode formed on the back surface of the substrate. A current diffusion layer formed of GaAlAs is interposed between the double hetero structure portion and the first electrode, said current diffusion layer having a thickness of 5 to 30 microns and a carrier concentration of 5×1017 cm-3 to 5×1018 cm-3.
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Citations
10 Claims
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1. A semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure portion formed on the substrate and consisting of an InGaAsP active layer and upper and lower clad layers having the active layer sandwiched therebetween, a first electrode formed on a part of the surface of the double hetero structure portion, and a second electrode formed on the surface of the substrate opposite to the double hetero structure portion, wherein the active layer is set to be of p-type having a carrier concentration of 1×
- 1017 cm-3 or less and has a thickness falling within a range of between 0.05 and 0.75 micron, and a current spreading layer is interposed between the double hetero structure portion and the first electrode.
- View Dependent Claims (2, 3, 4, 5)
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6. A semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure, portion formed on the substrate and consisting of an InGaAsP active layer and upper and lower clad layers having the active layer sandwiched therebetween, a first electrode formed on a part of the surface of the double hetero structure portion, and a second electrode formed on the surface of the substrate opposite to the double hetero structure portion, wherein a GaAlAs current diffusion layer is interposed between the double hetero structure portion and the first electrode, said current diffusion layer having a thickness of 5 to 30 microns and a carrier concentration of 5×
- 1017 cm-3 to 5×
1018 cm-3.
- 1017 cm-3 to 5×
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7. A semiconductor light emitting device, comprising a semiconductor substrate of a first conductivity type, a reflective layer of the first conductivity type formed on the front surface of the substrate, a transparent buffer layer of the first conductivity type formed on the reflective layer, a double hetero structure portion formed of an InGaAlP series material, positioned on the transparent buffer layer, and consisting of a lower clad layer of the first conductivity type, an upper clad layer of a second conductivity type and an active layer interposed between the lower and upper clad layers, a current spreading layer of the second conductivity type formed on the double hetero structure portion, a first electrode formed on the current spreading layer, a second electrode formed on the back surface of the substrate, and a current inhibiting layer of the first conductivity type formed in a part between the double hetero structure portion and the first electrode in a manner to face the first electrode.
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8. A semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure portion formed on the front surface of the substrate and consisting of an InGaAlP active layer and lower and upper clad layers having the active layer sandwiched therebetween, a first electrode formed in a part of the surface of the double hetero structure portion, and a second electrode formed on the back surface of the substrate, wherein the substrate is formed of GaAs, and the planar direction of the crystal-growing major surface of the substrate is inclined from the (100) plane by at least 5°
- in the [011] direction, and a current spreading layer is interposed between the double hetero structure portion and the first electrode.
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9. A semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure portion formed on the front surface of the substrate and consisting of an InGaAlP active layer and lower and upper clad layers having the active layer sandwiched therebetween, a first electrode formed in a part of the surface of the double hetero structure portion, and a second electrode formed on the back surface of the substrate, wherein a current spreading layer is formed between the double hetero structure portion and the first electrode.
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10. A semiconductor light emitting device, comprising a semiconductor substrate, a double hetero structure portion formed on the substrate and consisting of an InGaAsP active layer and upper and lower clad layers having the active layer sandwiched therebetween, a first electrode formed on a part of the surface of the double hetero structure portion, and a second electrode formed on the surface of the substrate opposite to the double hetero structure portion, wherein the active layer is set to be of n-type having a carrier concentration of 5×
- 1016 cm-3 or less and has a thickness falling within a range of between 0.05 and 0.75 micron, and a current spreading layer is interposed between the double hetero structure portion and the first electrode.
Specification