III-nitride light-emitting device with increased light generating capability
First Claim
1. A light-emitting device comprising:
- a heterostructure of III-nitride materials comprising an active region having a peak emission wavelength, an n-layer, and a p-layer;
a p- and an n-electrode, the p-electrode being attached to the p-layer, the n-electrode being attached to the n-layer, wherein the p-electrode and n-electrode are attached to a same side of the light emitting device; and
a superstrate, having a refractive index greater than a refractive index of sapphire, attached to the heterostructure.
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Abstract
The present invention is an inverted III-nitride light-emitting device (LED) with enhanced total light generating capability. A large area device has an n-electrode that interposes the p-electrode metallization to provide low series resistance. The p-electrode metallization is opaque, highly reflective, and provides excellent current spreading. The p-electrode at the peak emission wavelength of the LED active region absorbs less than 25% of incident light per pass. A submount may be used to provide electrical and thermal connection between the LED die and the package. The submount material may be Si to provide electronic functionality such as voltage-compliance limiting operation. The entire device, including the LED-submount interface, is designed for low thermal resistance to allow for high current density operation. Finally, the device may include a high-refractive-index (n>1.8) superstrate.
120 Citations
36 Claims
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1. A light-emitting device comprising:
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a heterostructure of III-nitride materials comprising an active region having a peak emission wavelength, an n-layer, and a p-layer;
a p- and an n-electrode, the p-electrode being attached to the p-layer, the n-electrode being attached to the n-layer, wherein the p-electrode and n-electrode are attached to a same side of the light emitting device; and
a superstrate, having a refractive index greater than a refractive index of sapphire, attached to the heterostructure. - 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, 33, 34, 35, 36)
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Specification