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Recently, the research group of Academician Huang Wei and Professor Qin Tianshi of Nanjing University of Technology jointly developed a full-frame color-changing smart window
.
This kind of window can not only automatically adjust the light intensity and color depth according to the intensity of sunlight, improve indoor lighting; it can also reduce the direct sunlight temperature by more than 9 ℃; moreover, this kind of smart window can also achieve 100% % Effective space utilization
In recent years, smart windows that can dynamically adjust light transmittance and selectively absorb ultraviolet or infrared bands have shown great application potential in buildings, automobiles, and airplanes
.
At present, the monolithic highly integrated color-changing smart window cannot achieve 100% effective space utilization, and will block part of the visible light from passing through the smart window, thereby affecting indoor lighting
In response to this problem, the researchers used a self-developed fully transparent perovskite photovoltaic layer, and the overall vertical series connection, thus achieving 100% effective space utilization
.
More importantly, the research team designed a method based on halogen ion exchange, in which the perovskite photovoltaic layer is immersed in a specific chemical solvent, and the ratio of each component in the chemical material is adjusted according to the length of the immersion time.
As a result, this photovoltaic layer material achieves a light transmittance of up to 76%
.
This method can also enable the smart window to show different depths of colors according to different sun light intensity, and automatically adjust the indoor lighting according to different weather
At the same time, this kind of smart window also has an adjustment function in the infrared light band, which can control infrared.
The color-changing smart window absorbs part of the infrared light and reduces the penetration of infrared light, thereby reducing the indoor temperature by more than 9 ℃, which is greatly reduced.
This reduces the indoor energy consumption requirements for air-conditioning cooling
.
Qin Tianshi's research group provided an effective method for preparing smart windows with high light transmittance, which significantly improved the optical performance of smart windows, which is of great significance for realizing smart windows with full-frame high contrast and stability
.
In the future, the achievements of smart windows will be widely used in buildings, automobiles, airplanes and other fields.
