156results about How to "Change color quickly" patented technology

The invention discloses an electrochromic material and an electrochromic device. The electrochromic material is characterized in that the electrochromic material is a mixture which is composed of a cathode electrochromic material and an anode electrochromic material, wherein the anode electrochromic material is provided with three structure general formulas, different substituting groups are arranged on a pyridinium loop so as to aim to strengthen the stability of the structure which is converted to be in a planar state from a orthogonal state and charge dispersibility in the pyridinium loop in a color-changing process, and increase an electric potential difference delta E between the two states; and the electrochromic device comprises a transparent conductive glass and a conductive reflecting glass, wherein a transparent conducting layer (2) of the transparent conductive glass and a conductive reflecting layer (4) of the conductive reflecting glass are arranged oppositely, the peripheries of the transparent conductive glass and the conductive reflecting glass are glued through a glue body so as to form a cavity body, and the electrochromic material is filled in the cavity body. The electrochromic device provided by the invention has the characteristics of long service life and rapid color changing rate and discoloring rate, and is suitable for the fields of anti-dazzling automobile rearview mirrors for intelligent windows of light-dimmer glass for construction.

Large contrast ratio and rapid switching laminated electrochromic (EC) polymer device includes transparent electrode, cathodic EC polymer, gel electrolyte, and counter-electrode. Preferably the cathodic EC polymer is a poly(3,4-propylenedioxythiophene) derivative, PProDOT-Me2. Counter-electrode is a conductive coating deposited on transparent substrate, with preferred coatings including gold and highly conductive carbon. Lithography and sputtering can be employed to pattern a gold layer, while screen printing can be employed to similarly pattern graphite. Empirical studies of preferred device indicate a color change of high contrast ratio of transmittance (>50% T) is rapidly (0.5–1s) obtained upon applied 2.5V, repeatable to at least 10,000 times, as estimated by electrochemistry. Dual layer EC devices including PProDOT-Me2 are also disclosed, as are methods for synthesizing preferred EC polymers. Preferred synthesis method for obtaining PProDOT-Me2 involves refluxing reagents in toluene in the presence of catalyst, while continually removing methanol byproduct from refluxing solution.