High-performance ultra-narrow-band green-emitting phosphor LaMgAl11O19:Mn2+ for wide color-gamut WLED backlight displays

Explorations of narrow-band green-emitting phosphors have attracted much attention due to their great application potential in wide color-gamut wLED backlight displays. Herein, a high-performance narrow-band green-emitting phosphor LaMg0.72Al11O19:0.28Mn(2+) (LMAO:0.28Mn(2+)) was synthesized with a high activator doping content. The LMAO:0.28Mn(2+) green phosphor exhibits an ultra-narrow-band green emission peaking at 517 nm with an intriguing full width at half maximum of similar to 24 nm. The LMAO:0.28Mn(2+) not only has a good internal quantum efficiency of 97.6% but also has an excellent low thermal quenching performance (92.3% peak intensity @423 K), especially an excellent resistance to color drifting (3.82 parts per thousand @423 K). A wLED device fabricated using LMAO:0.28Mn(2+), K2SiF6:Mn4+ phosphors and a blue chip shows a wide color-gamut of 131% National Television System Committee (NTSC) standard, making LMAO:0.28Mn(2+) a highly promising candidate for wide color-gamut wLED backlights. The new strategy can be easily expanded to other systems and boost the development of efficient narrow-band emitting phosphors.