Nitride semiconductor light-emitting devices

A nitride semiconductor device comprising an n-side semiconductor region comprising nitride semiconductor layers, a p-side semiconductor region comprising nitride semiconductor layers and an active layer of a nitride semiconductor between said n-side semiconductor region and said p-side semiconductor region, the active layer having a multiple quantum well structure comprising nitride semiconductor layers containing In,

• wherein said n-side semiconductor region has an n-side super lattice layer comprising one or more first nitride semiconductor layers and one or more second nitride semiconductor layers each having a different composition and each of said first nitride semiconductor layers and each of said second nitride semiconductor layers being laminated alternately, said n-side super lattice layer comprising at least three layers laminated in the order of the first nitride semiconductor layer, the second nitride semiconductor layer and the first nitride semiconductor layer, or in the order of the second nitride semiconductor layer, the first nitride semiconductor layer and the second nitride semiconductor layer,
• wherein said p-side semiconductor region has a p-side super lattice layer comprising one or more third nitride semiconductor layers and one or more fourth nitride semiconductor layers each having a different composition and each of said third nitride semiconductor layers and each of said fourth nitride semiconductor layers being laminated alternately, the third nitride semiconductor layers being made of a nitride semiconductor containing Al.