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Patent Granted PROBLEM TO BE SOLVED: To provide a p-type MgZnO-based thin film which functions as a (p) type, and a semiconductor light-emitting element comprising the p-type MgZnO-based thin film. ; SOLUTION: A p-type Mg<SB>x</SB>Zn<SB>1-x</SB>O-based thin film 1 is formed on a substrate 2 formed of a ZnO-based semiconductor.