“In the field of luminescent materials, researchers have prepared ZnGa2O4: xCr3+, yMgF2 phosphors using high-temperature solid-phase method, and studied their phase structure and luminescent properties. The results indicate that the dominant role of MgF2 doping is played by F ions, which replace F/O anions to form [CrO6] and [Cr (O, F) 6] luminescent centers with different local environments, significantly broadening the luminescence spectrum of ZnGa2O4: Cr3+. Furthermore, by increasing the concentration of Cr3+, the emission spectrum was continuously redshifted, achieving tunable luminescence in the peak wavelength range of 689-900 nm; Stable/transient spectroscopic analysis indicates that the significant red shift of the spectral peak is due to energy transfer between different Cr3+luminescent centers. The optimized sample ZnGa2O4: 0.1Cr3+, 0.2MgF2 (ZMGOF: 0.1Cr3+) exhibits good comprehensive performance. Under blue light excitation, the broadband near-infrared emission covers the 700-1200 nm band, with a peak wavelength of 885 nm and a full width at half maximum of 215 nm; And it has excellent luminous efficiency and thermal stability, with internal and external quantum efficiencies of 92.3% and 48.1%, respectively, and an intensity retention rate of about 89.6% at 100 ℃. The LED device packaged with ZMGOF: 0.1Cr3+fluorescent powder has a near-infrared light output power of about 34.5 mW and an energy conversion efficiency of about 12.3% under 100 mA current driving.”