| 摘要 |
The present invention provides a nitride semiconductor light emitting device with an active layer of the multiple quantum well structure, in which the device has an improved luminous intensity and a good electrostatic withstanding voltage, thereby allowing the expanded application to various products. The active layer 7 is formed of a multiple quantum well structure containing In<SUB>a</SUB>Ga<SUB>1-a</SUB>N (0<=a<1). The p-cladding layer 8 is formed on said active layer containing the p-type impurity. The p-cladding layer 8 is mode of a multi-film layer including a first nitride semiconductor film containing Al and a second nitride semiconductor film having a composition different from that of said first nitride semiconductor film. Alternatively, the p-cladding layer 8 is made of single-layered layer made of Al<SUB>b</SUB>Ga<SUB>1-b</SUB>N (0<=b<=1). A low-doped layer 9 is grown on the p-cladding layer 8 having a p-type impurity concentration lower than that of the p-cladding layer 8 . A p-contact layer is grown on the low-doped layer 9 having a p-type impurity concentration higher than those of the p-cladding layer 8 and the low-doped layer 9.
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