Method and structure for improved LED light output
First Claim
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1. A light emitting diode structure comprising:
- a substrate; and
a plurality of layer structures formed on said substrate, each one of said plurality of layer structures comprising a tunnel junction and a quantum well active region surrounded by a pair of cladding layers, said plurality of layer structures arranged in a vertical stack with respect to said substrate such that a first one of said plurality of layer structures is closest to said substrate and a second one of said plurality of layer structures is furthest from said substrate.
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Abstract
The efficiency of LEDs is increased by incorporating multiple active in series separated by tunnel junction diodes. This also allows the LEDs to operate at longer wavelengths.
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Citations
20 Claims
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1. A light emitting diode structure comprising:
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a substrate; and
a plurality of layer structures formed on said substrate, each one of said plurality of layer structures comprising a tunnel junction and a quantum well active region surrounded by a pair of cladding layers, said plurality of layer structures arranged in a vertical stack with respect to said substrate such that a first one of said plurality of layer structures is closest to said substrate and a second one of said plurality of layer structures is furthest from said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for forming a light emitting diode structure comprising:
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a substrate; and
forming a plurality of layer structures on said substrate, each one of said plurality of layer structures comprising a tunnel junction and a quantum well active region surrounded by a pair of cladding layers, said plurality of layer structures arranged in a vertical stack with respect to said substrate such that a first one of said plurality of layer structures is closest to said substrate and a second one of said plurality of layer structures is furthest from said substrate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification