prepared red-emitting ZnGa2O4:Cr3+ thin film phosphors by a sol–gel process and studied the effects of calcining temperature, film thickness and the type of substrates on microstructures, composition ratios Zn/Ga and optical properties of the polycrystalline
ZnGa2O4:Cr3+ films. In this paper, we prepare the Cr3+-doped ZnGa2O4 powder via a solid-state reaction and then deposit it as a thin film on quartz substrates by the pulsed laser deposition technique
under two different deposition conditions. The emission characteristics of ZnGa2O4:Cr3+ powder and thin film samples are compared, and the effect of oxygen pressure in the deposition process on the crystal structure and optical properties of ZnGa2O4:Cr3+ thin films are examined.