HIGHLY EFFICIENT GALLIUM NITRIDE BASED LIGHT EMITTING DIODES VIA SURFACE ROUGHENING
First Claim
Patent Images
1. A (B, Al, Ga, In) N light emitting diode (LED), comprised of:
- a plurality of (B, Al, Ga, In)N layers including at least an n-type layer, an emitting layer, and a p-type layer;
wherein light from the emitting layer is extracted through a nitrogen face (N-face) surface of at least one of the layers of the LED, and the N-face surface is comprised of one or more structures, so that the light is scattered or diffracted, in order to increase extraction efficiency of the light out of the N-face surface.
1 Assignment
0 Petitions
Accused Products
Abstract
A gallium nitride (GaN) based light emitting diode (LED), wherein light is extracted through a nitrogen face (N-face) of the LED and a surface of the N-face is roughened into one or more hexagonal shaped cones. The roughened surface reduces light reflections occurring repeatedly inside the LED, and thus extracts more light out of the LED. The surface of the N-face is roughened by an anisotropic etching, which may comprise a dry etching or a photo-enhanced chemical (PEC) etching.
6 Citations
20 Claims
-
1. A (B, Al, Ga, In) N light emitting diode (LED), comprised of:
-
a plurality of (B, Al, Ga, In)N layers including at least an n-type layer, an emitting layer, and a p-type layer; wherein light from the emitting layer is extracted through a nitrogen face (N-face) surface of at least one of the layers of the LED, and the N-face surface is comprised of one or more structures, so that the light is scattered or diffracted, in order to increase extraction efficiency of the light out of the N-face surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of creating a (B, Al, Ga, In) N light emitting diode (LED), comprising:
-
fabricating a plurality of (B, Al, Ga, In) N layers including at least an n-type layer, an emitting layer, and a p-type layer; wherein light from the emitting layer is extracted through a nitrogen face (N-face) surface of at least one of the layers of the LED, and the N-face surface is comprised of one or more structures, so that the light is scattered or diffracted, in order to increase extraction efficiency of the light out of the N-face surface.
-
-
14. A (B, Al, Ga, In) N light emitting diode(LED), comprised of:
-
at least an n-type layer, an emitting layer, a p-type layer and a p-type electrode; wherein light from the emitting layer is extracted through a nitrogen face (N-face) surface of the LED and the N-face surface of the LED is comprised of structures that increase extraction efficiency of the light out of the N-face surface of the LED; wherein the structures comprise a plurality of etched cones; and wherein the p-type electrode has a property of high reflection to increase light reflection towards the N-face surface. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification