Patent ID: 9231162
Filing Date: 2016-01-05
CPC Classification: H01L

Claim Text:
1. A light-emitting element having a front surface and a back surface and adapted to extract light from the back surface with the front surface facing down, the light-emitting element comprising: a substrate transparent to a light-emitting wavelength and defining the back surface; an n-type nitride semiconductor layer provided on the substrate; a light-emitting layer which is provided on the n-type nitride semiconductor layer and emits light at the light-emitting wavelength; a p-type nitride semiconductor layer provided on the light-emitting layer; a transparent electrode layer which is provided on the p-type nitride semiconductor layer and is transparent to the light-emitting wavelength of the light-emitting layer; and a reflective electrode layer which is provided on the transparent electrode layer and reflects light passing through the transparent electrode layer toward the back surface; wherein the transparent electrode layer includes a first electrode sublayer provided on the p-type nitride semiconductor layer and a second electrode sublayer provided on the first electrode sublayer, further wherein the transparent electrode layer has a thickness T satisfying a following expression (1): wherein in expression (1), λ is the light-emitting wavelength of the light-emitting layer, and n is a refractive index of the transparent electrode layer.