Preparation and Research of Raspberry‐Like Micro‐Nano Structured Light Diffuser

ABSTRACT Light diffusion film is a functional optical material designed to transform intense and non‐uniform light from point or line sources into uniformly distributed, soft, and glare‐free surface illumination through the scattering effect of embedded diffusion particles. In this study, raspberry‐like composite particles were synthesized via electrostatic adsorption between PMMA microspheres and nano‐sized SiO 2 . These particles were subsequently blended with a polysiloxane‐modified acrylic resin, diluted, and coated onto a polyethylene terephthalate (PET) substrate to fabricate a light diffusion coating. The surface morphology of the composite particles and the resulting diffusion film was characterized using scanning electron microscopy (SEM), polarized optical microscopy, and confocal laser scanning microscopy. Optical performance, including transmittance and haze, was evaluated using a transmittance/haze meter and a UV‐visible spectrophotometer. Compared to the pristine PET substrate, which exhibited a transmittance of 89.2%, the optimized diffusion film—achieved at a 6 wt% loading of diffusion particles relative to the acrylic resin—demonstrated superior light diffusion properties with a transmittance of 80.2% and a haze of 91.0%. Furthermore, the underlying light diffusion mechanism was systematically investigated.