Abstract
A series of (4−x)MgO·xMgF2·GeO2:0.02Mn4+ deep-red nanosized phosphors with orthorhombic symmetry was synthesized via a sol–gel process using CF3COOH as fluorine source. The microstructure, composition, morphology, and grain size of the samples, and the effect of synthesis conditions were investigated by powder X-ray diffractometry, X-ray photoelectron spectroscopy, transmission electron microscopy, thermogravimetry, and differential thermal analysis. The luminescence properties of (4−x)MgO·xMgF2·GeO2:0.02Mn4+ were discussed as a function of synthesis conditions. Under 280nm light excitation, (4−x)MgO·xMgF2·GeO2:0.02Mn4+ shows two broad bands centered near 660nm and 632nm, which originate from the 2E→4A2 transition of the Mn4+ ion and an anti-Stokes vibronic transition, respectively.
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