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

Abstract

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 LaMg_0.72Al₁₁O₁₉:0.28Mn²⁺ (LMAO:0.28Mn²⁺) was synthesized with a high activator doping content. The LMAO:0.28Mn²⁺ green phosphor exhibits an ultra-narrow-band green emission peaking at 517 nm with an intriguing full width at half maximum of ∼24 nm. The LMAO:0.28Mn²⁺ 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‰ @423 K). A wLED device fabricated using LMAO:0.28Mn²⁺, K₂SiF₆:Mn⁴⁺ phosphors and a blue chip shows a wide color-gamut of 131% National Television System Committee (NTSC) standard, making LMAO:0.28Mn²⁺ 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.