Regulation of β-Sialon and KSF Phosphors in Mini-LED Backlight

Mini-LED backlight technology has become the core solution for high-end displays due to its high contrast and wide color gamut characteristics. In this paper, we propose a Mini-LED backlighting technology based on the synergistic ratio of KSF red powder (K2SiF6:Mn4+) and β-Sialon green powder (Si6-zAl2O7N8-z:Eu2+) synergistically proportioned Mini-LED backlighting technology, this paper addresses the problems of limited color gamut (NTSC1nm) and high scattering loss due to the broad spectral characteristics of traditional silicate phosphors. Through comparative experiments, it is found that the optimization of the red-to-green irradiance ratio can effectively suppress the competing absorption and red light scattering paths in the spectral overlap region (450-460nm) when the mass ratio of red-to-green phosphor is 2.5:1, achieving a luminous efficacy of 104.55lm/W and neutral white coordinates (x=0.33, y=0.37). Combined with the structural stability of hexagonal-phase β-Sialon and cubic-phase KSF verified by XRD, the system showed a red wavelength drift of4+strong crystal field effect (2Eg →4A2g jump), the synergistic effect of particle size modulation (β-Sialon D50=8 μm) and Mn4+strong crystal field effect (2Eg→4A2g jump), which can break through the bottleneck of the red-light proportion in the traditional 3:1 ratios (> 55%) and the color drift rate > 1.2%, and provide a new opportunity for the high-dynamic dimming suitability of Mini-LED backlighting (0Hz flicker-free) and ergonomic requirements, providing an innovative solution with high color gamut, low power consumption and thermal stability.