Photoluminescence enhancement of Mn4+-doped Rb2NaAlF6 single-crystal phosphors via heterovalent co-doping for wide gamut displays

A high-performance single-crystal red phosphor Rb 2 NaAlF 6 :Mn 4+ ,Mg 2+ with a shorter fluorescence lifetime (4.93 ms), excellent chromaticity coordinates (0.7001, 0.2998), and a high EQE (50.91%) is demonstrated by a defect-rare engineering strategy.