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KMID : 1159320180200020109
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Korean Journal of Vision Science
2018 Volume.20 No. 2 p.109 ~ p.118
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The Optimum Aging Condition in the Percolation Phenomenon in the Preparation for Electrochromic Glasses
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Choi Dong-Soo
Kim Sung-Hee
Kim Jae-Hwa
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Abstract
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Purpose : Smart glasses are the effective application of wearable electronic devices and glasses. It can be expected that the manufacture of chromic glasses actively performed by the applied voltage will be possible. Therefore, we have studied the percolation threshold affected the electrochromic property in sol-gel fabrication method to optimize aging condition for the fabrication electrochromic coating.
Methods : Electrochromic solution was synthesized using tungsten hexachloride and ethanol in sol-gel process. The solution samples were analyzed based on the aging. And electrochromic properties were tested, when the ITO glass substrates were coated with electrochromic coating, using a lithium ion base electrolyte.
Results : The electrochromic solution samples synthesized by the sol-gel method have different bindings of tungsten and oxygen according to aging. This samples were analyzed by infrared spectroscopy. As a result of measuring the optical transmittance (luminous transmittance) of the whole visible light region of WO3/ITO glass, the aging affected the chromic efficiency. In addition, the sample that is not percolated has the optical transmittance of 43.0 % at the colored state and 63.6% at the bleached state, with the highest optical density of 1.10 among samples. The sample that is aged for a long time turned out to be the darkest in the colored state.
Conclusions : The electrochromic thin films, prepared by the sol-gel method, were investigated their optical properties according to aging. In the case of aging for a long time, the optical density was decreased. Therefore, when a lens with good chromic efficiency is required, it is preferable to use a solution having a shorter aging time than the percolation threshold. If an optical sample requires dark coloring, it is better to use a long-aged solution. We expect the study of basic conditions for these thin film coatings to serve as a reference for the fabricating electrochromic smart glasses in the future.
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KEYWORD
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Electrochromic, Smart glass, Percolation, Sol-gel process, Spin coating Address reprint
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