Patent ID: 8716728

Claim:
A nitride semiconductor light-emitting diode chip comprising (a1) a GaN substrate, (a2) a nitride semiconductor layer, formed on the GaN substrate, the nitride semiconductor layer having a laminated structure in which an n-type layer, a light emitting layer, and a p-type layer are laminated in this order from the GaN substrate, (b) a light-transmissive electrode made of an oxide semiconductor formed on the nitride semiconductor layer, wherein a surface of the light-transmissive electrode has a surface roughness of less than 5 nm, in arithmetic means roughness (Ra) as an index, (c) a reflection film formed on the surface of the light-transmissive electrode having the surface roughness of less than 5 nm, and (d) a conductive substrate, wherein the conductive substrate, the reflection film, the light-transmissive electrode, and the nitride semiconductor layer, and the GaN substrate in this order form a laminate structure, and wherein a surface of the GaN substrate is rough such that the light emitted from the light emitting layer is extracted to the outside through the surface of the GaN substrate.