US Patent No. 10,121,937

LIGHT EXTRACTION USING FEATURE SIZE AND SHAPE CONTROL IN LED SURFACE ROUGHENING


Patent No. 10,121,937
Issue Date November 06, 2018
Title Light Extraction Using Feature Size And Shape Control In Led Surface Roughening
Inventorship Rajwinder Singh, Pleasanton, CA (US)
John Edward Epler, San Jose, CA (US)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,121,937

1. A light emitting device, comprising:a light emitting structure, comprising:
a light extraction surface, comprising:
an undoped template layer devoid of islanding growth;
a first conductive semiconductor layer on the undoped template layer, the first conductive semiconductor layer being devoid of islanding growth and less durable to etching than the undoped template layer; and
etching features extending into the undoped template layer and the first conductive semiconductor layer, wherein a topology of the etching features at the undoped template layer is sharper than a topology of the etching features at the first conductive semiconductor layer;
an active layer on the first conductive semiconductor layer;
a second conductive semiconductor layer on the active layer, the second conductive semiconductor layer being an opposite polarity as the first conductive semiconductor layer; and
N and P-type contacts on a same surface opposite the light extraction surface.