Large-area (>1 cm2), vertically aligned ZnGa2O4, Mn2+ doped ZnGa2O4 (ZnGa2O4:Mn2+) and Cr3+ doped ZnGa2O4 (ZnGa2O4:Cr3+ ) nanowire arrays were synthesized by a two-step thermal evaporation method using ZnO
nanowire arrays as the templates followed by reaction with Ga and/or dopant (Mn or Cr) vapors. Bright red, green, and blue luminescence was achieved, respectively, from ZnGa2O4:Cr3þ, ZnGa2O4:Mn2þ, and ZnGa2O4 nanowire arrays under ultraviolet light irradiation. The realization of three primary colors from one host material suggests that full color display based on ZnGa2O4 nanowires might be achievable.

J. Phys. Chem. Lett. 2010, 1, 354–357