Patent ID: 8872202

Claim:
A light-emitting device, comprising: a substrate having an upper surface and a lower surface opposite to each other and an annular side surface connecting the upper surface and the lower surface; a light emitting structure disposed on the upper surface of the substrate; and a coarse structure formed on the annular side surface of the substrate, wherein a ratio of a thickness of the substrate and a thickness of the coarse structure is greater than or equal to 1 and less than or equal to 20, a distance from a side of the coarse structure relatively near the upper surface of the substrate to the upper surface of the substrate is greater than or equal to 10 μm and less than or equal to 150 μm, and a distance from a side of the coarse structure relatively near the lower surface of the substrate to the lower surface of the substrate is greater than or equal to 0 μm and less than or equal to 100 μm.