Study on structure and luminescent properties of nanosized ZnGa₂O₄:Mn²⁺ powders prepared by citrate sol-gel process

Nanosized ZnGa₂O₄:Mn²⁺ powders were prepared by citrate sol-gel process. XRD, SEM, FT-IR, EPR and luminescence excitation and emission spectra were used to characterize the structure, shape and luminescent property of the powders. The results show that pure ZnGa₂O₄ phase was obtained in the samples sintered at 650°C for 7h and the powders size was about 50nm. Mn²⁺ ions occupied both the Td sites of ZnGa₂O₄ and the O_h sites, and optimum luminescent intensity can be obtained after the samples were calcined at 800°C with the doping concentration of Mn²⁺ being 0.3at%.