Shape-controlled synthesis of phosphor K₂SiF₆:Mn⁴⁺ nanorods and their luminescence properties

A series of efficient red phosphor K₂SiF₆:Mn⁴⁺ nanoparticles with uniform morphology and dispersity were successfully prepared through a fast liquid–solid solution route at room temperature. Potassium oleate and SiO₂ spheres/KMnO₄ molar ratio play an important role in the formation of the nanorod structures. When the KOH/oleic acid quality ratio is about 2.5 : 1 and the SiO₂ spheres/KMnO₄ molar ratio is about 1 : 10, the length of the nanorods is 1–2 μm and the width is 300–700 nm. Under UV and blue excitation, K₂SiF₆:Mn⁴⁺ samples show strong red emission, corresponding to the characteristic lines of Mn⁴⁺.