Tunable viewing angle characteristics of QD-enhanced LED lighting through combinations of holographic diffuser and prism film

This study explores the optical properties of LED lighting devices integrating holographic diffusers, red quantum dot (QD) films, and prism films to enhance color rendering and achieve controlled luminance distribution. Holographic diffusers, with varying scattering abilities, exhibited higher transmittance and haze properties compared to traditional diffuser plates. Incorporation of a red QD film significantly improved the color rendering performance while lowering the correlated color temperature. An analysis of the angular luminance profile across different optical configurations revealed that the viewing angle characteristics can be controlled, ranging from a more collimated distribution to a Lambertian distribution. The addition of crossed prism films enhanced collimation, particularly when used in conjunction with holographic diffusers of low scattering ability, and promoted increased excitation of quantum dots, thereby enriching the red emission spectrum. The findings offer design principles for LED lighting devices with tunable viewing angles, superior color rendering, and efficient light utilization, highlighting the effective combination of holographic diffusers and prism films for diverse lighting applications.