ZnGa2O4 has a normal spinel crystal structure with Fd3m space group, in which the tetrahedrally coordinated Zn sites (Td) are surrounded by four oxygen ions and octahedrally coordinated Ga sites (Oh) are surrounded by six oxygen ions. The 32 oxygen ions are C3v sites arranged in a close-packed cubic formation leaving 64 tetrahedral (Td) and 32 distorted (D3d) sites [5]. The un-doped ZnGa2O4 exhibits a blue emission spectrum under excitation by both ultraviolet light and low voltage electrons. When doped with Mn2+ or Cr3+ ions, ZnGa2O4 can have various emissions from green to red [6,7].