• • The Li4WO5:U6+ phosphor achieves a narrow FWHM of 35 nm at 525 nm with 60% quantum efficiency, enabling high color purity that directly addresses the LCD industry's need for wide color gamut backlighting.
• • Thermal stability tests show 107.6% intensity retention at 423 K with negligible chromaticity shift, ensuring consistent device performance under high-power LED operating conditions.
• • The fabricated white LED delivers 68 lm W−1 luminous efficiency and 110.2% NTSC color gamut coverage, significantly outperforming commercial β-Sialon:Eu2+-based devices (84.4% NTSC), which translates to superior color vibrancy in displays.
• • The weak electron-phonon coupling (S = 0.79) and structural robustness of Li4WO5:U6+ provide a viable pathway for next-generation backlighting, reducing reliance on complex synthesis and rare-earth materials.