微米级ZnS-Qds@聚硅氧烷核-壳型光扩散杂化微球的制备与应用

在液晶背光模组中通常使用扩散膜来提高光的散射效果，提高光的利用率。光散射粒子是影响光散射材料透光率和雾度的主要因素。有机硅微球由于热稳定性好，尺寸稳定性佳，粒径和折射率可以通过反应调控的特点，作为光扩散粒子应用于光扩散材料具有十分广阔的应用前景。本文通过在溶胶-凝胶法制备的聚硅氧烷微球上面沉淀一层被巯基聚硅氧烷包裹的硫化锌量子点(ZnS-Qds)，制得微米级ZnS-Qds@聚硅氧烷核-壳型光扩散杂化微球，并制备了添加不同质量分数的杂化微球的光扩散膜。采用TEM、TEM映射分析、荧光光度计等测试手段对所制备的杂化材料进行了表征，并对用该杂化粒子制备得到的光扩散膜进行了光学性能测试。结果表明，ZnS-Qds@聚硅氧烷光扩散杂化微球具有核壳结构，平均粒径约3.6μm，壳层平均厚度为87.4 nm，平均粒径为2 nm的ZnS-Qds均匀地分散在壳层中。将该粒子添加到丙烯酸树脂中并涂覆在聚对苯二甲酸乙二醇酯(PET)膜上以制成光扩散膜，实验结果表明，当杂化粒子添加量从0wt%增加到20wt%时，光扩散膜的雾度从1.67%提高到91.11%，而光扩散膜的透光率仅从90.10%降低到82.57%。

Preparation and application of micron-sized ZnS-Qds@ polysiloxane core-shell light diffusion hybrid microspheres

In liquid crystal backlight module, diffusion film is usually used to improve the scattering effect of light and improve the utilization rate of light. Light scattering particles are the main factors affecting the transmittance and haze of light scattering materials. Because of its good thermal stability and dimensional stability, particle size and refractive index can be adjusted by reaction, organosilicon microspheres have a very broad application prospect as light diffusion particles in light diffusion materials. Micron-sized ZnS-Qds@polysiloxane core-shell light-diffusion hybrid microspheres were prepared by precipitating a layer of ZnS quantum dot (ZnS-Qds) coated with mercapto polysiloxane on polysiloxane microspheres prepared by sol-gel method. Light diffusion films with different mass fractions of the hybrid microspheres added were prepared. The prepared hybrid materials were characterized by TEM, TEM mapping, fluorophotometer and other testing methods, also tested the optical properties of the light diffusion films prepared with hybrid particles. The results show that ZnS-Qds@polysiloxane light diffusion hybrid microspheres have a core-shell structure with an average particle size of 3.6 μm and an average shell thickness of 87.4 nm. Zns-Qds with an average particle size of 2 nm are uniformly dispersed in the shell layer. The particles are added to the acrylic resin and coated on the polyethylene terephthalate (PET) films to make light diffusion films. The experimental results show that when the added amount of hybrid particles increases from 0wt% to 20wt%, the haze of light diffusion films is greatly improved from 1.67% to 91.11%, but the transmittance of light diffusion films is only slightly reduced from 90.10% to 82.57%.