Device for emitting electromagnetic radiation at a predetermined wavelength
First Claim
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1. A device for emitting electromagnetic radiation at a predetermined wavelength, said device comprising:
- a cavity having a first bulk region of one conductivity type and a second bulk region of another conductivity type, wherein said first bulk region and said second bulk region are of substantially the same thickness and comprise essentially a first material with a first bandgap and having a refractive index n1, said first bulk region having charge carriers of a first conductivity type, said second bulk region having charge carriers of a second conductivity type, the total thickness of said first and said second bulk region having a value of about said predetermined wavelength divided by n1, at least one surface of said first region and one surface of said second region being essentially parallel, and wherein a barrier is provided for spatially separating the charge carriers of said first bulk region and said second bulk region, said barrier being substantially at an antinode of a standing wave pattern of said cavity, the recombination of the charge carriers at the barrier creating said radiation, said first region being adjacent to said barrier and said second region being adjacent to said barrier; and
a third region consisting essentially of a third material with a third bandgap in-between said first and said second region, said third bandgap being larger than said first bandgap.
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Abstract
A device for emitting radiation it a predetermined wavelength is disclosed. The device has a cavity comprising a first bulk region and a second bulk region of opposite conductivity type wherein a barrier is provided for spatially separating the charge carriers of the first and the second region substantially at the antinode of the standing wave pattern of said cavity. The recombination of the charge carriers at the barrier create radiation, the emission wavelength of the radiation being determined by the cavity.
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21 Claims
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1. A device for emitting electromagnetic radiation at a predetermined wavelength, said device comprising:
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a cavity having a first bulk region of one conductivity type and a second bulk region of another conductivity type, wherein said first bulk region and said second bulk region are of substantially the same thickness and comprise essentially a first material with a first bandgap and having a refractive index n1, said first bulk region having charge carriers of a first conductivity type, said second bulk region having charge carriers of a second conductivity type, the total thickness of said first and said second bulk region having a value of about said predetermined wavelength divided by n1, at least one surface of said first region and one surface of said second region being essentially parallel, and wherein a barrier is provided for spatially separating the charge carriers of said first bulk region and said second bulk region, said barrier being substantially at an antinode of a standing wave pattern of said cavity, the recombination of the charge carriers at the barrier creating said radiation, said first region being adjacent to said barrier and said second region being adjacent to said barrier; and
a third region consisting essentially of a third material with a third bandgap in-between said first and said second region, said third bandgap being larger than said first bandgap. - View Dependent Claims (2, 3, 4, 5)
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6. A device for emitting electromagnetic radiation at a predetermined wavelength, said device comprising:
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a cavity comprising a first bulk region of one, conductivity type and a second bulk region of another conductivity type, wherein said first bulk region and said second bulk region are substantially the same thickness, the first bulk region comprising essentially in a first material with a first bandgap and having a refractive index n1, the second bulk region comprising essentially in a second material with a second bandgap and having a refractive index n2, said first bulk region having charge carriers of a first conductivity type, said second bulk region having charge carriers of a second conductivity type, the total thickness (d) of the thickness of said first bulk region (d1) and the thickness of said second bulk region (d2) having a value d equal to about d1+d2 and being essentially determined according to the relation n1 d1+n2 d2=λ
, λ
being said predetermined wavelength, and wherein a barrier is provided for spatially separating the charge carriers of said first bulk region and said second bulk region, said barrier being substantially and an anitnode of a standing wave pattern of said cavity, the recombination of charge carriers at the barrier creating said radiation, said first region being adjacent to said barrier and said second region being adjacent to said barrier; and
a third region consisting essentially of a third material with a third bandgap inbetween said first and said second region, said third bandgap being larger than said first bandgap. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification