Acid-base responsive electrochromic film and preparation method and application thereof and electrochromic device

Abstract

The invention provides an acid-base responsive electrochromic film and a preparation method and application thereof and an electrochromic device. The acid-base responsive electrochromic film comprisesan electrochromic layer, and the electrochromic layer is prepared from, by weight, 30-50 parts of polymethyl methacrylate, 8-20 parts of acid-responsive dye, 8-20 parts of base-responsive dye, 15-30parts of plasticizer and 10-25 parts of electrolyte, wherein the acid-responsive dye is the combination of electrochromic acid and an acid-responsive material, and the base-responsive dye is the combination of electrochromic base and a base-responsive material. The acid-base responsive electrochromic film can generate stable and reversible color changes under the action of an external electric field, and has the electrochromic performance.

Description

technical field [0001] The invention belongs to the field of display technology, and relates to an acid-base responsive electrochromic film, a preparation method and application thereof, and an electrochromic device. Background technique [0002] Electrochromism is the optical property of a material, which refers to a stable and reversible color change under the action of an external electric field or current, which is intuitively manifested as a process in which the color and transparency of the material undergo reversible changes. Since the foreign scholar Plant first proposed the concept of electrochromism in the 1960s, the phenomenon of electrochromism has attracted widespread attention. Electrochromic devices can be prepared by using this electrochromic phenomenon. Electrochromic devices have unique advantages such as wide viewing angle, low driving voltage, and no power consumption memory. Therefore, they are widely used in sensitive windows, displays, and rearview mi...

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Problems solved by technology

[0003] At present, most electrochromic films use ITO glass as the conductive substrate. The assembly methods can be roughly divided into two categories. One method is to deposit the electrochromic film on the surface of the conductive substrate by physical or chemical methods. This method is relatively expensive to manufacture. It is more difficult to obtain a large-sized uniform electrochromic film; another method is to dissolve the electrochromic material in a gel or liquid electrolyte and fill it between two conductive substrates. Although this technology reduces the production cost, However, it is difficult to produce large-size, special-shaped color-changing films

CN101412588A discloses a preparation method of cathode electrochromic film and electrochromic glass, with H 2 WO 4 powder or Ni(NO 3 ) powder as raw material, using citric acid complexation-polymerization liquid phase chemical method, dip coating process or spin coating process to obtain a sol film on an ITO glass substrate, and obtain a cathodic electrochromic film through dry polymerization and low-temperature heat treatment. The method is complex, the electrochromic response time is long and consumes more energy; "Electroacid / Alkali Theory and Its Application in Organic Electrochromic Materials" mentioned that hydroquinone was used as electrochromic alkali, a new type of evil The oxazoline molecule FXF was used as an acid-base response color indicator to prepare an electrochromic device. The response time of the electrochromic device is short, but the stability of the device is poor.

[0004] At present, the global annual electronic display consumes a huge amount of energy, with an annual power consumption of more than 3.5 trillion kilowatt-hours, which is close to 19% of the total global power consumption, equivalent to the total annual power generation of 70 Three Gorges along the Yangtze River; and the traditional electronic display screen is due to Color flickering and background light stimulation will cause irreversible damage to human eyes

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