Device with inverted large scale light extraction structures

摘要

An interface including roughness components for improving the propagation of radiation through the interface is provided. The interface includes a first profiled surface of a first layer comprising a set of large roughness components providing a first variation of the first profiled surface having a first characteristic scale and a second profiled surface of a second layer comprising a set of small roughness components providing a second variation of the second profiled surface having a second characteristic scale. The first characteristic scale is approximately an order of magnitude larger than the second characteristic scale. The surfaces can be bonded together using a bonding material, and a filler material also can be present in the interface.

主权项

1. A device comprising:
a first at least partially transparent layer having a first profiled surface, wherein the first profiled surface comprises a set of large roughness components providing a first variation of the first profiled surface having a first characteristic scale; a second at least partially transparent layer having a second profiled surface adjacent to the first profiled surface, wherein the second profiled surface comprises a set of small roughness components providing a second variation of the second profiled surface having a second characteristic scale, and wherein the first characteristic scale is approximately an order of magnitude larger than the second characteristic scale, wherein the first at least partially transparent layer and the second at least partially transparent layer are sapphire; and bonding material attaching the first profiled surface and the second profiled surface, wherein the bonding material has a refractive index selected based on a refractive index of at least one of: a material of the first at least partially transparent layer or a material of the second at least partially transparent layer.