A specular reflective electrochromic device and its preparation method

Abstract

The invention discloses a mirror reflection type electrochromic device and a preparation method thereof. The electrochromic device comprises transparent conducting glass, an insulating spacer, gel electrolyte, zinc oxide (ZnO) nanocrystallines and aluminum zinc oxide (AZO) transparent conducting glass. The preparation method comprises the following specific steps: directly growing the ZnO nanocrystallines on an AZO transparent glass electrode to form a coarse surface; uniformly mixing silver ion inorganic salt, bromide or iodide salt, auxiliary conducting ion inorganic salt and high-molecular polymer in organic solvent to from the transparent, stable and uniform gel electrolyte; using an encapsulating material to encapsulate the gel electrolyte between the transparent conducting glass with smooth surface and the AZO transparent conducting glass with coarse surface. The mirror reflection type electrochromic device has the advantages of simple technology and low cost, and large-area dimming devices with high reflectance, high transmittance and quick response capacity can be assembled.

Description

technical field [0001] The invention relates to the fields of optoelectronic materials and devices and information display, in particular to a specular reflection electrochromic device and a preparation method thereof. Background technique [0002] Electrochromism (Electrochromism) means that under the action of an applied current or electric field, the optical properties (transmittance, reflectivity, absorptivity, emissivity, etc.) It is a reversible change of optical properties such as color. Electrochromic glass is widely used in architectural decoration, energy-saving glass, anti-glare automobile rearview mirror and other fields; display devices prepared by this method are also important in the field of information display. Traditional electrochromic devices based on transition metal oxide hydrogen ion or lithium ion implantation type and metal electrodeposition type can only realize the change of two states: transparent state and colored state. However, the hydrogen i...

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Problems solved by technology

Traditional electrochromic devices based on transition metal oxide hydrogen ion or lithium ion implantation type and metal electrodeposition type can only realize the change of two states: transparent state and colored state.

However, the hydrogen ion implanted electrochromic device based on Mg-Ni alloy can achieve specular reflection, but its reflectivity is low, and it needs to generate hydrogen through electrolysis of water, or the catalysis of noble metal Pd, which undoubtedly increases the cost of the device.

Recently, some researchers have proposed to use the basic principle of uniform electrodeposition of silver ions on a smooth surface to form a mirror surface, and the strong non-uniform light scattering deposited on a non-smooth surface to form a black opaque state. Light and black are opaque electrochromic devices. However, the traditional indium tin oxide (ITO) is used as a transparent electrode in the literature, and the rough surface is formed by spin-coating or spraying of ITO nanoparticles. Due to the rising cost of ITO , will drive up the cost of the device

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