SEMICONDUCTOR LIGHT-EMITTING DEVICE
First Claim
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1. A semiconductor light-emitting device comprising:
- a substrate comprising;
a first surface; and
a second surface opposing the first surface;
a light-emitting structure disposed on the first surface of the substrate, the light-emitting structure comprising;
a first conductivity-type semiconductor layer;
an active layer; and
a second conductivity-type semiconductor layer; and
a reflector comprising;
a first Bragg layer;
a separation layer; and
a second Bragg layer,wherein the first Bragg layer, the separation layer, and the second Bragg layer are sequentially disposed on the second surface of the substrate,wherein the first Bragg layer comprises a first plurality of layers alternately stacked, each of the first plurality of layers having a refractive index different from refractive indices of each other layer among the first plurality of layers,wherein the second Bragg layer comprises a second plurality of layers alternately stacked, each of the second plurality of layers having a refractive index different from refractive indices of each other layer among the second plurality of layers, andwherein a thickness of the separation layer is greater than thicknesses of each layer among the first plurality of layers and the second plurality of layers.
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Abstract
A semiconductor light-emitting device having improved light extraction efficiency provided by a reflector including a separation layer. The separation layer may be interposed between first and second Bragg layers including one or more pairs of refractive layers having different refractive indices, the first pairs being stacked on one side of the separation layer and the second pairs being stacked on an opposing side of the separation layer.
11 Citations
23 Claims
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1. A semiconductor light-emitting device comprising:
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a substrate comprising; a first surface; and a second surface opposing the first surface; a light-emitting structure disposed on the first surface of the substrate, the light-emitting structure comprising; a first conductivity-type semiconductor layer; an active layer; and a second conductivity-type semiconductor layer; and a reflector comprising; a first Bragg layer; a separation layer; and a second Bragg layer, wherein the first Bragg layer, the separation layer, and the second Bragg layer are sequentially disposed on the second surface of the substrate, wherein the first Bragg layer comprises a first plurality of layers alternately stacked, each of the first plurality of layers having a refractive index different from refractive indices of each other layer among the first plurality of layers, wherein the second Bragg layer comprises a second plurality of layers alternately stacked, each of the second plurality of layers having a refractive index different from refractive indices of each other layer among the second plurality of layers, and wherein a thickness of the separation layer is greater than thicknesses of each layer among the first plurality of layers and the second plurality of layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A semiconductor light-emitting device, comprising:
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a light-emitting structure comprising; a first conductivity-type semiconductor layer; an active layer; and a second conductivity-type semiconductor layer; and a reflector disposed on a surface of the light-emitting structure, the reflector comprising; a plurality of Bragg layers; and at least one separation layer interposed between two layers among the plurality of Bragg layers, the separation layer having a thickness greater than 0.8 λ
/n, wherein λ
is a wavelength of light and n is a refractive index. - View Dependent Claims (16, 17, 18)
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19-20. -20. (canceled)
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21. A semiconductor light-emitting device comprising:
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a light-emitting structure configured to emit light; a reflector disposed opposing a rear surface the light-emitting structure, the reflector configured to reflect light, which is emitted towards the reflector by the light-emitting structure, towards the light-emitting structure, wherein the reflector comprises; a first Bragg layer; a second Bragg layer; and a separation layer interposed between the first Bragg layer and the second Bragg layer. - View Dependent Claims (22)
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23-25. -25. (canceled)
Specification