Luminescence properties and energy transfer of near-infrared SrGa12O19 phosphor
In this paper,phosphor SrGa12O19 co-doped with Cr3+and Yb3+was prepared by high temperature solid-phase method.X-ray diffractometer,scanning electron microscope and photoluminescence spectroscopy were used to characteristic the physical phase purity,chemical composition and luminescence properties of the phosphor.The results show that the emission spectra of Cr3+and Yb3+co-doped SrGa12O19 phosphor exhibits both of Cr3+and Yb3+emission peaks with excitation wavelength of 468 nm which is contributed to the 4A2 → 4T1 transition of Cr3+,the emission peaks of Cr3+and Yb3+appeared in the SrGa12O19 phosphor at the same time,which indicates that there is an energy transfer of Cr3+→Yb3 in the SrGa12O19 host.The emission of Yb3+in the phosphor is in the range of 950-1100 nm,which matches the spectral response region of crystalline silicon(C-Si)solar cells.The luminescence intensity of Yb3+can be enhanced by increasing the doping concentration of Cr3+,and the phosphor can still maintain 82.1％of the initial luminescence intensity at a temperature of 207 ℃.The results of this study can provide a good reference for the study of strategy to improve the spectral conversion efficiency of SrGa12O19 phosphor in C-Si solar cells.
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