Patent ID: 8525197

Claim:
A semiconductor light emitting device comprising: an n-type semiconductor layer including a nitride semiconductor; a p-type semiconductor layer including a nitride semiconductor; and a light emitting part provided between the n-type semiconductor layer and the p-type semiconductor layer and including: a first light emitting layer including a nitride semiconductor and including; a first well layer region including In with an In composition ratio among the group III elements not less than 20 atomic percent; and a first non-well layer region juxtaposed with the first well layer region in a plane perpendicular to a first direction from the n-type semiconductor layer towards the p-type semiconductor layer, the first non-well layer region including an In composition ratio lower than an In composition ratio of the first well layer region; a first barrier layer provided between the first light emitting layer and the p-type semiconductor layer and having a band gap energy larger than a band gap energy of the first well layer region; a second light emitting layer provided between the first barrier layer and the p-type semiconductor and including a nitride semiconductor, the second light emitting layer including: a second well layer region including In with an In composition ratio same as the In composition ratio of the first well layer region; and a second non-well layer region juxtaposed with the second well layer region in a plane perpendicular to the first direction, the second non-well layer region having an In composition ratio lower than the In composition ratio of the second well layer region; a second barrier layer provided between the second light emitting layer and the p-type semiconductor layer and having a band gap energy larger than a band gap energy of the second well layer region; and an n-side barrier layer provided between the first light emitting layer and the n-type semiconductor layer and having a band gap energy larger than the band gap energy of the first well layer region, at least one of the first well layer region and the second well layer region including a portion having a width in a direction perpendicular to the first direction of 50 nanometers or more, wherein a peak wavelength of light emitted from the light emitting part is not less than 500 nanometers.