Group III-nitride based resonant cavity light emitting devices fabricated on single crystal gallium nitride substrates
First Claim
1. A resonant cavity light emitting device including:
- a stack of group III-nitride layers having no tilt-boundaries and having a dislocation density less than 104 cm−
2, the stack including a first mirror sub-stack defining a distributed Bragg reflector and an active region; and
a mirror cooperating with the first mirror sub-stack to define a resonant cavity inside of which the active region is disposed.
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Accused Products
Abstract
In a method for producing a resonant cavity light emitting device, a seed gallium nitride crystal (14) and a source material (30) are arranged in a nitrogen-containing superheated fluid (44) disposed in a sealed container (10) disposed in a multiple-zone furnace (50). Gallium nitride material is grown on the seed gallium nitride crystal (14) to produce a single-crystal gallium nitride substrate (106, 106′). Said growing includes applying a temporally varying thermal gradient (100, 100′, 102, 102′) between the seed gallium nitride crystal (14) and the source material (30) to produce an increasing growth rate during at least a portion of the growing. A stack of group III-nitride layers (112) is deposited on the single-crystal gallium nitride substrate (106, 106′), including a first mirror sub-stack (116) and an active region (120) adapted for fabrication into one or more resonant cavity light emitting devices (108, 150, 160, 170, 180).
129 Citations
29 Claims
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1. A resonant cavity light emitting device including:
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a stack of group III-nitride layers having no tilt-boundaries and having a dislocation density less than 104 cm−
2, the stack including a first mirror sub-stack defining a distributed Bragg reflector and an active region; anda mirror cooperating with the first mirror sub-stack to define a resonant cavity inside of which the active region is disposed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A resonant cavity light emitting device including:
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a stack of group III-nitride layers including an active region; a single-crystal gallium nitride substrate substantially free of tilt-boundaries on which the stack of group III-nitride layers is disposed, the single-crystal gallium nitride substrate having a dislocation density less than 104 cm−
2; andfirst and second mirrors defining a resonant cavity inside of which the active region is disposed, light produced by the active region resonating in the resonant cavity, at least one of the first and second mirrors including a distributed Bragg reflector. - View Dependent Claims (21, 22, 23, 24)
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25. A resonant cavity light emitting device including:
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a single-crystal gallium nitride substrate having a characteristic absorption peak at about 3175 cm−
1 with an absorbance per unit thickness greater than about 0.01 cm−
1.a stack of group III-nitride layers disposed on the single-crystal gallium nitride substrate, the stack including a first mirror sub-stack and an active region; and a mirror cooperating with the first mirror sub-stack to define a resonant cavity inside of which the active region is disposed. - View Dependent Claims (26, 27)
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28. A resonant cavity light emitting device including:
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a stack of group III-nitride layers including an active region; a single-crystal gallium nitride substrate substantially free of tilt-boundaries on which the stack of group III-nitride layers is disposed, the single-crystal gallium nitride substrate having a dislocation density less than 102 cm−
2; andfirst and second mirrors defining a resonant cavity inside of which the active region is disposed, light produced by the active region resonating in the resonant cavity.
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29. A resonant cavity light emitting device including:
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a stack of group III-nitride layers including an active region; a single-crystal gallium nitride substrate substantially free of tilt-boundaries on which the stack of group III-nitride layers is disposed, the single-crystal gallium nitride substrate having a dislocation density less than 104 cm−
2; andfirst and second mirrors arranged parallel with the active region and defining a vertical resonant cavity inside of which the active region is disposed, light produced by the active region resonating in the resonant cavity.
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Specification