Narrow-band green phosphor RbK2Na(Li3SiO4)4:Eu2+ with excellent thermal stability and high efficiency for wide color gamut displays

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-12, Vol.12 (47), p.19148-19155
• Main Authors: Weiguang Ran, Geng, Jiayi, Zhou, Ziyou, Zhou, Chunyuan, Wang, Fukai, Zhao, Ming, Tingjiang Yan
• Format: Article
• Language: English
• Subjects: Backlights; Color; Europium; Light emitting diodes; Luminescence; Optical properties; Phosphors; Quantum efficiency; Rigid structures; Thermal stability; White light
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d4tc02600d

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 RbK2Na(Li3SiO4)4:Eu2+ 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 RbK2Na(Li3SiO4)4:5%Eu2+ with commercial red K2SiF6:Mn4+ 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 RbK2Na(Li3SiO4)4:Eu2+ phosphor for liquid-crystal backlight applications.