Abstract:

        We successfully acquire a series of ZnxMg1-xGa2O4:Co2+( x=0,0.25, 0.5, 0.75 and 1.0) compound spinel through lowtemperature combustion with Zn(NO3)2·6H2O, Mg(NO3)2·4H2O, Ga(NO3)3·6H2O, CO(NH2)2, NH4NO3, and Co(NO3)2·6H2O as raw materials. We further analyze their characteristics by Xray diffractometer, transmission electron microscope, and F4500 fluorospectrophotometer. Results reveal that these products are not simple mixture of MgGa2O4 and ZnGa2O4, a new solid solution material. A better linear relationship exists between the lattice constant of ZnxMg1-xGa2O4:Co2+(0 ≤x≤ 1.0) crystals and doping density x. Synthesized crystals have high crystallinity with neater array. Form and position analysis of emission spectrum show that the strong emission peak near the visible region (670 nm) is attributed to energy level transition (4T1(4P) → 4A2(4F)) of Co2+ in the tetrahedron. The weak emission peak near the infrared region is attributed to energy level transition (4T1(4P) →4T2(4F) of Co2+ in the tetrahedron.

Key words: combustion method, ZnxMg1-xGa2O4, Co2+, nanocrystal