Light diffusing material refers to a material that can convert point and line light sources into line and surface light sources. Generally speaking, the role of such materials is to make the light source look less glaring after being refracted, reflected and scattered. That small series will lead everyone to understand the common light diffusing materials in LEDs .
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Preparation
At present, the preparation methods of the light diffusion material mainly include a polymerization method and a blend modification method.
First, the polymerization method
The polymerization method is based on the principle of light refraction, selecting two polymer monomers having a certain difference in refractive index, poor compatibility, or using segmental polymerization to further prepare a light-scattering light-diffusing material. Two kinds of monomers with different reactivity are prepared by polymerization, because the scatterer monomer has different reactivity with the matrix-forming monomer, and the scatterer monomer is self-polymerized or copolymerized with the matrix monomer, such two monomers The optical properties of the condensed core formed in the respective polymer chains are uniform, and the boundary light at the boundary of the condensed core is reflected and refracted, thereby forming scattering. The polymerization method is widely used in the preparation of PMMA-based light diffusing materials.
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Second, the blending modification method
The blending modification method is to add a light diffusing agent to the resin. The light diffusing agent is spherical and uniformly dispersed in the transparent resin to form a sea-island structure. Since the refractive index of the resin and the light diffusing agent are different, the light is similar to the specular reflection on the surface of the light diffusing agent. After multiple reflections, the light diffusion effect is achieved. At the same time, the amount of light diffusing agent added, particle size and distribution, and refractive index determine the optical properties of the material.
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At present, many light-diffusing materials are generally produced by this method, because this method is similar to polymer doping, and the process is simple, especially in the case of a very large amount of light-diffusing sheet, which can be continuously produced and produced. efficient.
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