Lighting system with high and improved extraction efficiency
First Claim
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1. A solid state light emitting device comprising:
- an active layer emitting light in response to current injected into the layer;
a first structure adjacent to the active layer, said structure and said active layer trapping the light generated by the active layer; and
a second structure extracting the light that is trapped by the first structure, said second structure comprising a plurality of photonic crystal arrays with different parameters.
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Abstract
In an epitaxial structure of a solid state lighting system, electrical current injection into the active layer is used to excite the photon emission. The present invention employs a unique waveguide layer in the epitaxial structure for trapping the light generated by the active layer in the fundamental waveguide mode. Multiple photonic crystal regions with different characteristics located either outside or inside one or more current injection regions extract photons from the waveguide layer(s). The present invention creates solid state lighting with high optical output and high power efficiency.
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Citations
49 Claims
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1. A solid state light emitting device comprising:
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an active layer emitting light in response to current injected into the layer;
a first structure adjacent to the active layer, said structure and said active layer trapping the light generated by the active layer; and
a second structure extracting the light that is trapped by the first structure, said second structure comprising a plurality of photonic crystal arrays with different parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for making a solid state light emitting device, comprising:
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providing an semiconductor body, said body having an active layer that emits light when electrical current is injected into the layer, and at least another layer adjacent to the active layer;
forming at least one array of holes in said at least another layer to provide photonic crystal arrays; and
forming reflective structures each surrounding a portion of the active layer and some of the holes in the array. - View Dependent Claims (34)
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35. A solid state light emitting device comprising a plurality of chips, each chip comprising:
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an active layer emitting light in response to current injected into the layer;
a first structure adjacent to the active layer, said structure and said active layer trapping the light generated by the active layer; and
a second structure extracting the light that is trapped by the first structure, said second structure comprising a plurality of photonic crystal arrays with different parameters. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification