Bi-directional dual-color light emitting device and systems for use thereof
First Claim
1. A two-terminal light emitting semiconductor device comprising:
- a) A first and a second active regions having radiative recombination as dominant carrier recombination mechanism;
b) a first carrier supply region of a first carrier type sandwiched between the first and the second active regions;
c) a second carrier supply region of a second carrier type adjacent to the first active region in such a way that said first active region is sandwiched between the first carrier supply region and the second carrier supply region, the second carrier supply region connected to a first of the two semiconductor device terminals;
d) a third carrier supply region of the second carrier type adjacent to the second active region in such a way that said second active region is sandwiched between the first carrier supply region and the third carrier supply region, the third carrier supply region connected to a second of the two semiconductor device terminals;
wherein said two-terminal light emitting semiconductor device produces a first wavelength of light when biased with a first sign of a polarity of an electric bias, and produces a second wavelength of light when biased with a second sign of the polarity of the electric bias applied to the terminals of said light emitting semiconductor device wherein the second sign is opposite the first sign.
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Abstract
An LED optimized for use in low-cost gas or other non-solid substance detection systems, emitting two wavelengths (“colors”) of electromagnetic radiation from the same aperture is disclosed. The LED device emits a light with a wavelength centered on an absorption line of the target detection non-solid substance, and also emits a reference line with a wavelength that is not absorbed by a target non-solid substance, while both wavelengths are transmitted through the atmosphere with low loss. Since the absorption and reference wavelengths are emitted from the same exact aperture, both wavelengths can share the same optical path, reducing the size and cost of the detector while also reducing potential sources of error due to optical path variation.
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Citations
14 Claims
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1. A two-terminal light emitting semiconductor device comprising:
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a) A first and a second active regions having radiative recombination as dominant carrier recombination mechanism; b) a first carrier supply region of a first carrier type sandwiched between the first and the second active regions; c) a second carrier supply region of a second carrier type adjacent to the first active region in such a way that said first active region is sandwiched between the first carrier supply region and the second carrier supply region, the second carrier supply region connected to a first of the two semiconductor device terminals; d) a third carrier supply region of the second carrier type adjacent to the second active region in such a way that said second active region is sandwiched between the first carrier supply region and the third carrier supply region, the third carrier supply region connected to a second of the two semiconductor device terminals; wherein said two-terminal light emitting semiconductor device produces a first wavelength of light when biased with a first sign of a polarity of an electric bias, and produces a second wavelength of light when biased with a second sign of the polarity of the electric bias applied to the terminals of said light emitting semiconductor device wherein the second sign is opposite the first sign. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification