Homogeneous core-shell structure stabilizes Mn4+-doped fluoride red phosphors for high-performance warm-white LEDs

One of the most important prerequisites for the development of phosphor materials for practical applications in lighting and displays is their long-term stability under ambient conditions[1,2].Although manganese(IV)-doped narrow-band red-emitting fluoride phosphors with outstanding photoluminescence properties show great promise in white light-emitting diodes(LEDs)and widecolor-gamut LED backlight displays[3,4],their instability towards moisture remains the biggest challenge to be overcome[5-8].