Narrow-band green phosphor RbKNa(LiSiO):Eu with excellent thermal stability and high efficiency for wide color gamut displays

The development of efficient and thermally stable narrow-band-emitting phosphors is crucial for wide color gamut display applications. Herein, we have developed a novel narrow-band green-emitting RbK 2 Na(Li 3 SiO 4 ) 4 :Eu 2+ phosphor with remarkable luminescence properties. The phosphor exhibits a main green emission band at 535 nm, with a narrow full width at half maximum of 51 nm, attributed to its unique rigid structure and highly symmetric cationic sites. Furthermore, it demonstrates excellent thermal stability, retaining 90.95% of the integrated emission intensity at 500 K compared to that at 100 K, and exhibits a high internal quantum efficiency of 82.51%. By combining RbK 2 Na(Li 3 SiO 4 ) 4 :5%Eu 2+ with commercial red K 2 SiF 6 :Mn 4+ phosphors and blue GaN chips, a white light-emitting diode device with a wide color gamut (103% NTSC) was prepared, demonstrating the potential of the RbK 2 Na(Li 3 SiO 4 ) 4 :Eu 2+ phosphor for liquid-crystal backlight applications. Combining RbK 2 Na(Li 3 SiO 4 ) 4 :5%Eu 2+ with K 2 SiF 6 :Mn 4+ and a blue GaN chip, a WLED with a large wide color gamut (103% NTSC) was prepared, demonstrating the potential of the RbK 2 Na(Li 3 SiO 4 ) 4 :Eu 2+ phosphor for liquid-crystal backlight applications.