Abstract
The effects of H3BO3 and MgF2 fluxes on the crystal structure and photoluminescence (PL) of MgGa2O4:Mn2+ phosphors were investigated. The PL excitation spectra of the powders consisted of intensive broad bands (∼290nm), and sharp peaks at longer wavelengths. The former could be attributed to charge transfer between the Mn2+ and O2− ions, referred to as charge transfer band (CTB), while the latter was attributed to the d–d transitions of Mn2+ ions. Under CTB excitation, the PL spectra exhibited green emission peaks at 505nm, assignable to the 4T1(4G) → 6A1(6S) transition of Mn2+ ions in tetrahedral sites. Compared to MgF2, H3BO3 was more favorable for phase formation, higher crystallinity, and particle size enlargement, thus resulting in a significant enhancement in the emission intensity. The Mn2+ concentration affected the CTB and the crystal structure; the strongest emission intensity was observed for a high Mn2+ concentration of 0.5mol%.
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