Optical Coating by Hybrid Sol
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Optical Coating by Hybrid Sol Wei-Hong Wang1 and Lih-Yue Chen1 1 Chemical Engineering Section, Chemical Systems Research Division, Chung Shan Institute of Science and Technology, Taiwan 325, R.O.C. ABSTRACT The fluorocarbon/SiO2 hybrid sol (L) for low refractive index coating was made by tetraethoxysilane (TEOS) and polytetrafluoroethylether derivative(PTFEED) with the hydrolysis and condensation in ethanol to get with coating refractive index as ( nL=1.38). It can be coated on glass with single layer by quarter wave, the anti-reflective (AR) coating glass would have less than 3 % reflection. The TiO2 hybrid sol are prepared by tetraisopropyl orthotitanate(TPOT) with silane coupling agent and acrylic resin. The TiO2 hybrid sol with the coating refractive index ( nH=1.75) used as high refraction coating sol (H). More acrylic resin added to get less coating refractive index ( nM=1.65) used as middle refractive coating sol (M). Three layers AR coating glass can be made by M/H/L design to get 1.0 % reflection, have 3H hardness, 500g scratch resistance, and 107° water contact angle. These two kinds AR coating with fluorocarbon /SiO2 hybrid sol (L) coating on surface has anti-stain efficacy, which can be applied on the touch panel screen of flat panel display for mobile phone, PDA and e-book.
INTRODUCTION In the market, flat panel displays (FPD) with the touching screen for mobile phone, PDA and e-book is basic demand. The FPD with a protect glass for touching screen with optical coating, such as anti-stain[9] and anti-glare[10] with anti-reflection, is indispensable to improve the visibility of FPD. Anti- reflective(AR) coating is the effective to improve the visibility of FPD by optical coating with one-layer, two-layer, three-layer or multilayer. As the anti-stain(AS) or anti-glare(AG) coating on the glass for FPD, many other functions required, such as anti-static [11], conducting[12], heat-insulating[13], UV absorbing[14] properties, which can be made by multiplayer coating. This AR coating is designed by quarter wave with interference phenomenon as the optical thickness, it was coated symmetrically on two-sides of the substrate. In general, one or two layers AR coating can get the V-type or W-type reflective spectrum, three or more layers AR coating with M/H/L design can obtain W-type or U-type reflective spectrum. Refractive index is the fundamental characteristic of materials for optical coating. By sol-gel technology, It is the advantage to prepare the sol easily with different refractive index coating, such as: low-refractive index coating by SiO2 sol, high-refractive index coating by TiO2 sol. and middle refractive index coating sol which can be mixed with SiO2 and TiO2 sol by the refractive index to be need with interpolate ratio of them or their precursor for SiO2-TiO2 sol. These SiO2, TiO2 and SiO2-TiO2 sol are coated on glass by dip coating with high temperature sintering for AR coating. Other advantage of sol-gel optical coating, for plastic, those sols can be modified by organic with the functional group
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