Study on Synthesis and Properties of K₂SiF₆: Mn⁴⁺ Phosphor

Abstract

K2SiF6:Mn4+ phosphor was prepared by wet chemical etching, and the effect of the raw material molar ratio of K/Mn of different materials and different reaction time on the structure and properties of phosphor was studied,the surface of K2SiF6:Mn4+ was coated with SiO2 to improve the thermal stability of K2SiF6:Mn4+ phosphor by sol-gel method. The structure, morphology, excitation spectrum and emission spectrum of phosphor powder were characterized by X-ray diffraction, scanning electron microscope and fluorescence spectrometer. The results show that the change of K/Mn ratio does not change the crystal structure of K2SiF6:Mn4+, the sample has cubic structure. At 460nm excitation, the strongest narrowband emission peak is located at 630nm (2Eg → 4A2). The crystal structure of K2SiF6:Mn4+ phosphor coated with SiO2 has not been changed. The results show that the thermal stability of the K2SiF6:Mn4+ phosphor coated with SiO2 is improved.

Keywords

• K₂SiF₆:Mn⁴⁺
• K/Mn
• red phosphor
• structure and property
• SiO₂ coating