An electrochromic film, its preparation method and application, and an electrochromic device

Abstract

The invention provides an electrochromic film, its preparation method and application, and an electrochromic device. The electrochromic film includes an electrochromic layer, and the raw materials of the electrochromic layer include the following components in parts by weight 30-50 parts by weight of polymethyl methacrylate; 18-22 parts by weight of acid response dye; 20-30 parts by weight of plasticizer; 10-20 parts by weight of electrolyte; wherein, the acid response dye is electroacid and A combination of acid responsive materials. The electrochromic thin film provided by the invention can undergo stable and reversible color changes under the action of an external electric field, and has electrochromic properties.

Description

technical field [0001] The invention belongs to the technical field of display devices, and relates to an electrochromic thin 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 mirrors of ...

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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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