Patent ID: 9543485
Date: 2017-01-10
CPC Classifications: H01L

Claim:
1. A light emitting device comprising: a semiconductor structure layer having a first conductive semiconductor layer, a second conductive semiconductor layer, and an active layer between the first and second conductive semiconductor layers; and a plurality of lower refractive layers provided on an outer surface of the semiconductor structure layer, wherein the lower refractive layers include a first lower refractive layer having a first refractive index lower than a refractive index of the semiconductor structure layer on a surface of the semiconductor structure layer and a second lower refractive layer having a second refractive index lower than the first refractive index on an outer surface of the first lower refractive layer, wherein the second refractive index of the second lower refractive layer is 1.5 or less, wherein the second lower refractive layer is provided with a plurality of protrusions on an outer surface of the second lower refractive layer, wherein the second lower refractive layer includes a plurality of metallic oxide powders, wherein the outer surface of the semiconductor structure layer includes a plurality of lateral sides and a top surface of the semiconductor structure layer, wherein a sum of thicknesses of the plurality of lower refractive layers is less than a thickness of the semiconductor structure layer, and wherein the plurality of protrusions protrude outwardly on the outer surface of the second lower refractive layer, wherein each of the metallic oxide powders includes a material having a refractive index of 1.49 or less.