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US 7,095,052 B2Granted
Method and structure for improved LED light output
AssigneeAvago Technologies ECBU IP (Singapore) Pte. Ltd.
InventorSteven D. Lester
Life of this patent
Estimating the term…
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.
Claims20
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.
A method for forming a light emitting diode structure comprising:
- 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.
Dependencies are inferred from the claim text.