Porous Polymer Films with Gradient-Refractive-Index Structure for Broadband and Omnidirectional Antireflection Coatings
Porous Polymer Films with Gradient-Refractive-Index Structure for Broadband and Omnidirectional Antireflection Coatings
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用于宽带和全向减反射涂层的具有梯度折射率结构的多孔聚合物薄膜
DOI：
10.1002/adfm.200901052
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发表时间：
2010-01-22
影响因子：
19
通讯作者：
Han, Yanchun
中科院分区：
文献类型：
--
作者：
Li, Xiao;Gao, Junpeng;Han, Yanchun
多孔聚合物薄膜，可用于宽带和全方位涂层成功地显示。这些薄膜形成梯度折射率结构，并通过将聚苯乙烯-嵌段-聚（甲基丙烯酸甲酯）（PS-b-PMMA）/PMMA共混物的溶液旋涂到十八烷基三氯硅烷（OTS）改性的玻璃基板上来实现。因此，获得了PMMA畴在整个微相分离膜的垂直方向上的梯度分布。在去除那些PMMA域之后，形成在膜的垂直方向上具有优异的梯度孔隙率比的PS多孔结构。涂覆有这种多孔聚合物膜的玻璃基板表现出宽带和全方位的折射率特性，因为折射率从膜的顶部到底部逐渐增加。在这些梯度折射率结构中实现了对可见光和近红外（NIR）光的>97%的优异透射率。当入射角增加时，三个不同入射角的总透射率显著提高。同时，该膜在可见光范围内具有颜色再现特性。
Porous polymer films that can be employed for broadband and omnidirectional antireflection coatings are successfully shown. These films form a gradient-refractive-index structure and are achieved by spin-coating the solution of a polystyrene-block-poly (methyl methacrylate) (PS-b-PMMA)/PMMA blend onto an octadecyltrichlorosilane (OTS)-modified glass substrate. Thus, a gradient distribution of PMMA domains in the vertical direction of the entire microphase-separated film is obtained. After those PMMA domains are removed, a PS porous structure with an excellent gradient porosity ratio in the vertical direction of the film is formed. Glass substrates coated with such porous polymer film exhibit both broadband and omnidirectional antireflection properties because the refractive index increases gradually from the top to the bottom of the film. An excellent transmittance of >97% for both visible and near-infrared (NIR) light is achieved in these gradient-refractive-index structures. When the incident angle is increased, the total transmittance for three different incident angles is improved dramatically. Meanwhile, the film possesses a color reproduction character in the visible light range.