Starting when GE launched the technology in 2014, PFS/KSF Phosphor filled the void for an efficient, on-chip red luminescent material desired in both display applications seeking wider color gamut performance as well as general illumination applications desiring high-efficiency lighting with truer color rendering of illuminated areas and objects. With PFS/KSF Phosphors in display devices, LEDs illuminate with a truer saturated red yielding vivid red colors while reducing yellowing of the green pixel emission. In general illumination, the technology has enabled lighting products with 90CRI and R9>50 at the same/better lumen efficiency as 80CRI products starting with products launched in 2015. Moreover, the technology is well suited for high-quality, high-efficient lighting as evaluated with evolving color standards (e.g. TM-30). Significant progress has been made to enable more challenging applications for these fluoride Mn4+ phosphors in terms of both cost and reliability. Today’s use of this technology as well as areas of development, innovation, and expansion for PFS/KSF Phosphor will be discussed.