Ordered interface texturing for a light emitting device
DCFirst Claim
1. A light emitting device comprising:
- a device that includes,a substrate,a p-n junction region having multiple layers, wherein subsets of the multiple layers have opposing polarity such that a p-n junction is formed, one of the layers being adjacent the substrate,a transparent window layer, positioned adjacent the p-n junction region, andelectrical contacts, connecting to the p-n junction region, being operative to forward bias the p-n junction; and
a primary interface, positioned in the device, that is textured with repeated features in at least one selected direction, having an associated periodicity in each of the selected directions to increase light extraction and, within a period, having a cross-sectional profile having at least one peak and at least one valley.
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Abstract
This method relates to the fabrication of semiconductor light-emitting devices having at least one ordered textured interface. Controlled interface texturing with an ordered pattern is provided on any or all interfaces of such a device to enhance light extraction from these interfaces and thus improve the performance of the device.
Ordered interface texturing offers an improvement in light extraction by increasing the transmission of total optical power from the device into the ambient. This improvement is possible because ordered interface texturing can provide: 1) a reduction in Fresnel losses at the interface between the device and the ambient and, 2) a change or increase in the angular bandwidth of light which may transmit power into the ambient. This latter effect may be thought of a change or increase in the escape cone at an interface. Both effects can result in an overall increase in total light extraction efficiency for the LED.
693 Citations
22 Claims
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1. A light emitting device comprising:
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a device that includes, a substrate, a p-n junction region having multiple layers, wherein subsets of the multiple layers have opposing polarity such that a p-n junction is formed, one of the layers being adjacent the substrate, a transparent window layer, positioned adjacent the p-n junction region, and electrical contacts, connecting to the p-n junction region, being operative to forward bias the p-n junction; and a primary interface, positioned in the device, that is textured with repeated features in at least one selected direction, having an associated periodicity in each of the selected directions to increase light extraction and, within a period, having a cross-sectional profile having at least one peak and at least one valley. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for manufacturing a textured interface for a light emitting device made by the steps of:
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transferring at least one pattern to at least one interface of the device, wherein each pattern has repeating features having a periodicity in all directions and removing some of the device material according to the pattern to create an interface that is textured with the repeating features having a periodicity in all of the directions, wherein the periodicity for at least two of the directions has an associated period between 0.1 and 5.0 microns. - View Dependent Claims (17, 18, 21, 22)
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19. A method for manufacturing a textured interface for a light emitting device made by the steps of:
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transferring at least one pattern to at least one interface of the device, wherein each pattern has repeating features having a periodicity in at least one selected direction; removing some of the device material according to the pattern to create an interface that is textured with the repeating features having a periodicity in at least one direction; and filling in the at least some portion of interface using a material having a refractive index less than 3.
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20. A method for manufacturing a textured interface for a light emitting device made by the steps of:
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transferring at least one pattern to at least one interface of the device, wherein each pattern has repeating features having a periodicity in at least one selected direction; removing some of the device material according to the pattern to create an interface that is textured with the repeating features having a periodicity in at least one direction; and applying electrical contacts to the interface.
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Specification