Preparation of a novel red Rb₂SiF₆:Mn⁴⁺ phosphor with high thermal stability through a simple one-step approach

A new Rb₂SiF₆:Mn⁴⁺ phosphor has been successfully synthesized through a one-step co-precipitation method. The addition of H₂O₂ into the solution with appropriate reaction temperature results in the reduction of Mn⁷⁺ to Mn⁴⁺. Mn⁴⁺ is excited by UV and blue light, providing sharp red emission at approximately 630 nm. Rb₂SiF₆:Mn⁴⁺ has a Fm3m (225) cubic phase crystal structure as determined using X-ray diffraction and Total Pattern Analysis Solutions. No apparent impurity phase is found in the X-ray diffraction spectrum. All luminescence properties, namely, emission, excitation, and thermal luminescence spectrum, have been investigated in depth.