Semiconductor light emitting device including rear reflective part

A semiconductor light emitting device comprising:

• a light transmissive substrate having first and second main surfaces facing each other, the second main surface having an uneven portion formed thereon;
• a light emitting part disposed on the first main surface, and including first and second conductivity type semiconductor layers and an active layer interposed therebetween;
• first and second electrodes electrically connected to the first and second conductivity type semiconductor layers, respectively;
• and
• a rear reflective part including a reflective metallic layer disposed on the second main surface, and a light transmissive dielectric layer interposed between the light transmissive substrate and the reflective metallic layer,
• wherein the light transmissive dielectric layer and the reflective metallic layer form an omni-directional reflector (ODR) structure disposed on the second main surface,
• wherein a substantial portion of an entire surface between the reflective metallic layer and the light transmissive dielectric layer is uneven.