Improving color uniformity and the ambient contrast ratio of LEDs through the scattering-enhanced magnetic manipulation bilayered structure
Zongtao Li, Jiayong Qiu, Xiujuan Liu, Jiasheng Li
Abstract
To address challenges in enhancing color uniformity and ambient contrast ratio (ACR) in RGB light-emitting diodes (LEDs) without losing efficiency, we developed a scattering-enhanced magnetic manipulation (SEMM) bilayer structure. The effect of the TiO 2 scattering layer on improving the LED’s angular intensity non-uniformity (AIN) was studied by ray-tracing simulations and optimized by varying the particle concentration. The magnetic manipulation technique formed the microcolumns and magnetic chains of the Fe 3 O 4 anti-reflective layer, which was optimized by adjusting Fe 3 O 4 particle size, magnetic field strength, and Fe 3 O 4 concentration. The resulting bilayered device significantly increased the ACR by 11.38 times and reduced AIN by 63% compared to conventional graphite-based LEDs, while maintaining high brightness and consistent color quality across angles. This marks a pioneering application of magnetic manipulation in enhancing LED display quality.