Abstract: A method for forming an electrochromic layer pattern includes forming a transparent electrode layer and a photoresist layer on a transparent substrate, forming a photoresist pattern by laser interference lithography, and depositing an electrochromic layer pattern on the transparent electrode through openings defined by the photoresist pattern by depositing an electrochromic layer on a front surface of the substrate and then lifting up the photoresist pattern. An insulation layer may be further formed between the transparent layer and the photoresist layer. Here, the electrochromic layer may be formed after an insulation layer pattern is formed using the photoresist pattern as an etching mask. In this case, the electrochromic layer pattern is formed in openings defined by the insulation layer pattern. As a result, a contact surface area between the electrochromic layer pattern and the ion conductive layer is increased to ensure a rapid response speed.

Abstract: The present invention provides A method for preparing an electrode containing lithium nickel oxide wherein nickel has a single oxidation number, which comprises the following steps: a) preparing an electrode containing the lithium nickel oxide (LixNi1?yO, 0.4<x<1, 0<y<1) layer formed on the conductive substrate; and b) applying oxidative voltage to the electrode, and then applying reductive voltage thereto, an electrode prepared by the method and an electrochromic device containing the same. The electrode containing the lithium nickel oxide layer of the present invention exhibits wider optical electrochromic range and fast reaction speed, so that it can contribute to improving electrochromism and other optical properties of an electrochromic device.

Abstract: Disclosed are viologen derivatives as an electrochromic material having improved stability and lifetime, a metal oxide electrode including the same, and an electrochromic device using the viologen derivative as an electrochromic material. The viologen derivative includes a suitable regulator group capable of increasing ?E that is a potential difference between E1 (potential at the first redox reaction) and E2 (potential at the second redox reaction). When ?E increases, the mole fraction of viologen molecules present in the second reduction state decreases. Therefore, it is possible to lower the mole fraction of viologen molecules present in an irreversibly reduced state at an applied potential, thereby increasing the lifetime of an electrochromic material and an electrochromic device.

Abstract: Disclosed are viologen derivatives as an electrochromic material having improved stability and lifetime, a metal oxide electrode including the same, and an electrochromic device using the viologen derivative as an electrochromic material. The viologen derivative includes a suitable regulator group capable of increasing ?E that is a potential difference between E1 (potential at the first redox reaction) and E2 (potential at the second redox reaction). When ?E increases, the mole fraction of viologen molecules present in the second reduction state decreases. Therefore, it is possible to lower the mole fraction of viologen molecules present in an irreversibly reduced state at an applied potential, thereby increasing the lifetime of an electrochromic material and an electrochromic device.