K2SiF6:Mn4+ phosphors were synthesized by using different materials and methods The influence of synthesis parameters on the luminescent properties was investigated. The phase and composition of three K2SiF6:Mn4+ phosphors were determined by X-ray diffraction, Energy dispersive spectrometer and Fourier transform infrared spectroscopy. The microstructure and morphology of three K2SiF6:Mn4+ phosphors were observed by a field emission scanning electron microscope. The excitation spectrum of K2SiF6:Mn4+ phosphor consists of excitation bands in ultraviolet and blue regions originating from 4A2g → 4T1g and 4A2g → 4T2g transitions of Mn4+. The emission spectrum of K2SiF6:Mn4+ phosphor shows emission bands in red region resulting from the 2Eg → 4A2g transitions of Mn4+ ions. The addition of H2O2 in the synthesis favors the doping of Mn4+ in K2SiF6 host and thus increases the emission intensity of K2SiF6:Mn4+ phosphor. The luminescent properties of K2SiF6:Mn4+ phosphor suggests that it is a suitable candidate for warm white light emitting diodes. By combining blue chip, YAG:Ce yellow and K2SiF6:Mn4+ phosphors, white light emitting diodes were fabricated. They exhibit ‘warm’ white light that suitable use as indoor light.
Sun, X. Y., He, Z., & Gu, X. (2018). Synthesis, deep red emission and warm WLED applications of K2SiF6:Mn4+ phosphors. Journal of Photochemistry and Photobiology A: Chemistry, 350, 69–74. https://doi.org/10.1016/j.jphotochem.2017.09.051