Patent ID: 9142719
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A patterned substrate for epitaxially forming a light-emitting diode, comprising: a substrate body including: a top crystalline surface for epitaxial growth thereon; a plurality of spaced apart recesses, each of which extends downwardly from said top crystalline surface to terminate at a lower planar crystalline region that includes a central zone and a surrounding zone that surrounds said central zone; and a plurality of protrusions, each of which extends upwardly from said central zone of said lower planar crystalline region of a respective one of said recesses to terminate at an upper end surface that stops short of said top crystalline surface, wherein each of said recesses has a depth, and each of said protrusions has a height which is not greater than the depth of each of said recesses and greater than one half of the depth of each of said recesses, wherein said lower planar crystalline region has a diameter ranging from 2 microns to 7 microns, and a center-to-center distance between adjacent ones of said recesses is not less than said diameter of said lower planar crystalline region.