Deeply understand the types of electrochromic glass and the principle of color change.

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Foshan E&N Film Technology Co., Ltd., a high-tech enterprise in Foshan, has been focusing on the intermediate film industry for 15 years. Its products are positioned in the middle and high-end markets and are popular in China, Europe, North America and other parts of the world; Adhering to technological innovation, E&N Company is an enterprise with technology research center and constant temperature and humidity dust-free purification workshop in the same industry. The R&D and production process technology is ahead of the industry level, and has created jade sand white products of China's EVA intermediate membrane, SEG high-strength waterproof intermediate membrane and ionic intermediate membrane (commonly known as SGP) and other products. The products and technology keep pace with the world's advanced level. The cooperative projects have rich experience in supporting projects, and have successively undertaken the supply of dimmed glass for more than 100 five-star hotels at home and abroad, including: intercontinental, Kempinski, Marriott, Westin, St. Regis, Grand Hyatt, Sheraton, Hilton, W, Aimei, Novotel, Borman, Sofitel, Windham House and other international chain hotels.

Follow E&N to understand the type and color change principle of electrochromic glass. 


Color changing glass refers to the glass that changes its color under certain conditions such as light, temperature, electric field or current, and surface pressure, and changes accordingly with the change of conditions. When the applied conditions disappear, it can reversibly and automatically return to its original state, also known as dimming glass.

With the change of the external environment, the color changing glass changes its transmission characteristics, which can effectively control the solar radiation energy, so as to achieve the purpose of energy conservation.

According to the change mechanism of glass properties, the chromotropic glass can be divided into photochromic glass, thermochromic glass, electrochromic glass and force chromotropic glass. Among them, photochromic and electrochromic glass is particularly concerned by people in the curtain wall industry.

The principle of discoloration:

The electrochromic material undergoes electrochemical redox reaction under the action of an applied electric field, gains or loses electrons, and changes the color of the material.

Device structures from top to bottom are: glass or transparent substrate material, transparent conductive layer (such as ITO), electrochromic layer, electrolyte layer, ion storage layer, transparent conductive layer (such as ITO), glass or transparent substrate material.

When the device works, a certain voltage is applied between two transparent conductive layers, and the electrochromic layer material undergoes redox reaction under the action of voltage, and the color changes; The electrolyte layer is composed of special conductive materials, such as solution or solid electrolyte materials containing lithium perchlorate, sodium perchlorate, etc; The ion storage layer plays the role of storing corresponding counter ions and maintaining the charge balance of the whole system when the electrochromic material undergoes redox reaction. The ion storage layer can also be an electrochromic material with the opposite color changing performance to the previous electrochromic material, which can play the role of color superposition or complementation. For example, if the electrochromic layer is made of anodized electrochromic material, the ion storage layer can be made of anodized electrochromic material.

For information about electrochromic glass film, please pay attention to Foshan E&N Film Technology Co., Ltd.


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