Choi Jin-Wook, Lee Jun Hyup
Department of Chemical Engineering, Soongsil University, Seoul 06978, Korea.
Materials (Basel). 2020 Nov 21;13(22):5273. doi: 10.3390/ma13225273.
To simultaneously achieve the high visible transparency and enhance the ultraviolet (UV)-blocking performance of displays, inorganic-organic hybrid nanoparticles, comprising TiO as a core and poly(methyl methacrylate) (PMMA) as a shell, were uniformly incorporated into the optically clear adhesive (OCA) used in the front of a display device. The highly refractive TiO nanocore could selectively scatter UV rays, which degrade the display performance, owing to the differences in the refractive indices between the inorganic particles and PMMA matrix, thereby offering an improved UV protection property to the adhesive film. Moreover, the organic PMMA nanoshell maintained the high visible light transmittance of the pristine OCA film via the prevention of particle agglomeration. To examine the effect of the PMMA nanoshell and nanoparticle size on the optical properties of the adhesive films, the OCA films embedded with only TiO nanoparticles or hybrid nanoparticles with different particle sizes were prepared using a roll-to-roll process, and characterized in the range of UV and visible lights using UV-visible spectroscopy. It is experimentally revealed that the adhesive film including small TiO/PMMA hybrid nanoparticles at an extremely low content exhibited enhanced UV-blocking properties and increased visible light transmittance compared to that with only TiO nanoparticles.
为了同时实现高可见透明度并增强显示器的紫外线（UV）阻挡性能，将以TiO为核、聚甲基丙烯酸甲酯（PMMA）为壳的无机-有机杂化纳米粒子均匀地掺入显示设备前部使用的光学透明粘合剂（OCA）中。由于无机颗粒与PMMA基体之间的折射率差异，高折射率的TiO纳米核可以选择性地散射会降低显示性能的紫外线，从而为粘合剂膜提供改善的紫外线防护性能。此外，有机PMMA纳米壳通过防止颗粒团聚保持了原始OCA膜的高可见光透射率。为了研究PMMA纳米壳和纳米颗粒尺寸对粘合剂膜光学性能的影响，使用卷对卷工艺制备了仅嵌入TiO纳米颗粒或不同粒径杂化纳米颗粒的OCA膜，并使用紫外可见光谱在紫外光和可见光范围内对其进行了表征。实验表明，与仅含TiO纳米颗粒的粘合剂膜相比，包含极低含量小TiO/PMMA杂化纳米颗粒的粘合剂膜具有增强的紫外线阻挡性能和更高的可见光透射率。
