[en] Highlights: • Calculation of electronic structure of core/shell nanowire containing multi GaN quantum discs. • Investigation of the luminescence emission based on self-consistent calculations of Poisson-Schrodinger equations. • The study of the effect of structural parameters on luminescence spectrum and electronic structure. In this work, a numerical approach to investigate the room temperature luminescence emission from core/shell nanowire is presented where GaN quantum discs (QDiscs), periodically distributed in Al_xGa_1−xN nanowire, is considered as core and Al_xGa_1−xN as shell. Thin disc shaped (Ring shaped) n-doped region has been placed at the GaN/ Al_xGa_1−xN (Al_xGa_1−xN /air) interface in Al_xGa_1−xN region in axial (radial) directions. To obtain energy levels and related wavefunctions, self-consistent procedure has been employed to solve Schrodinger-Poisson equations with considering the spontaneous and piezoelectric polarization. Then luminescence spectrum is studied in details to recognize the parameters influent in luminescence. The results show that the amount of doping, size of QDiscs and theirs numbers have remarkable effects on the band to band luminescence emission. Our numerical calculations gives some insights into the luminescence emission of core/shell nanowire and exhibits a useful tool to analyze findings in experiments.