US Patent No. 10,355,168

LIGHT-EMITTING DEVICE WITH PATTERNED SUBSTRATE


Patent No. 10,355,168
Issue Date July 16, 2019
Title Light-emitting Device With Patterned Substrate
Inventorship Toni Lopez, Aachen (DE)
Assignee LUMILEDS LLC, San Jose, CA (US)

Claim of US Patent No. 10,355,168

1. A lighting device comprising:a substrate comprising a plurality of holes, wherein the holes extend from a top surface of the substrate;
a semiconductor structure grown on the top surface of the substrate, the semiconductor structure comprising a light emitting layer disposed between an n-type region and a p-type region, a portion of the semiconductor structure being disposed in the holes; and
a non-III-nitride material disposed within the plurality of holes and forming a gradient index optical interface between the semiconductor structure and the substrate, the top surface of the substrate being free of the non-III-nitride material, wherein the gradient index optical interface smoothly transitions from a first refractive index to a second refractive index between the semiconductor structure and the substrate, the second refractive index being closer to a refractive index of the substrate than is the first refractive index.