Use ultraviolet rays as “switch”! Chinese scientists have developed a magical and colorful smart window


Science and Technology Daily reporter Jin Feng correspondent Zhou Wei

Have you ever seen such a smart color change window? With the strength of the sun, they automatically regulate the intensity of light and improve indoor lighting; they can also reduce the hot sunlight in direct sunlight by more than 9 ° C … On June 20, the reporter from the Science and Technology Daily learned from Nanjing University of Technology that the Chinese Academy of Sciences was that the Chinese Academy of Sciences was that the Chinese Academy of Sciences was that the Chinese Academy of Sciences was that the Chinese Academy of Sciences was that the Chinese Academy of Sciences was that the Chinese Academy of Sciences was that the Chinese Academy of Sciences. The latest research results of academicians Huang Wei and a professor of Qin Tianshi, a professor of Nanjing University of Technology, recently published online in “Nature · Communication”.

The newly developed full -scale height through the smart window. Interviewee confidence

Use ultraviolet rays as “switches” to control the transmission of visible light and infrared rays

Today, smart windows that can dynamically adjust environmental lighting and temperature have shown greater application potential in construction, automobiles, aircraft and other fields.

“But the most common electrical discoloration smart window technology requires external power circuits, which will cause problems such as difficulty installation, damage, and difficult to replace; while optical or thermal discoloration technology cannot be freely switched and switched to color according to actual needs.

Photovoltaic discoloration technology combines the two major functions of self -driving and controllable. “

Qin Tianshi, a communication author of the paper and a professor at Nanjing University of Technology.

However, the current photovoltaic color window has a great challenge in integration. Qin Tianshi said that the commonly used form is to connect the solar cell with the electro -changing window through the external circuit, which will inevitably cause photovoltaic batteries, that is, solar cells occupy extra space, and most of the photovoltaic batteries adopted are not transparent. In the room, the full surface transparent light and discoloration effect of the smart window cannot be achieved, and it is difficult to apply it to products such as glass curtain walls, panoramic sunroofs. “In response to this issue, Academician Huang Wei and Professor Qin Tianshi

Designed a full -scale height contrast -discolored smart window, using ultraviolet rays that are useless for indoor environment as “switch”, controlling the transmission of visible light and infrared rays, thereby intelligently adjusting the brightness and temperature of the indoor. Essence

Traditional low light transmission, low space utilization, shoulder -to -shoulder smart windows. Interviewee confidence


“To achieve the above functions, we first need a fully transparent photovoltaic layer material.” Qin Tianshi said, “Unlike traditional solar cell materials, this new type of transparent photovoltaic layer material does not absorb visible light, so they look with The same glass, but they can absorb the ultraviolet rays invisible to human eyes, and then turn the energy of this part of the ultraviolet rays into electrical energy, thereby driving the electrical deformation layer material and realizing intelligent discoloration. “

It is precisely because the team uses the self -developed omnidirectional olty ore ore photovoltaic material that this integrated and color -changing smart window with a full -scale height contrast is realized. Different from the inductive structure of the inductive color degeneration windows driven by the photovoltaic battery plate connected to the external circuit, the integrated smart window of the all -transparent photovoltaic layer is used to use the layer structure to clamp the photovoltaic layer like the sandwich layer like a sandwich to two pieces. Between conductive glass, a 100%effective space utilization rate is achieved. “”.


Smart window light dependence on adaptive performance display real map. Interviewee confidence


There are application prospects in the fields of architecture, high -speed rail, pilot visual helmet and other fields

“The difficulty of this study is how to improve the light transmission rate of solar batteries.” Liu You, a doctoral student of the first author of the paper, said, “The research group designed a method based on halogen ion exchange to soak the photovoltaic layer of perovskite in a specific In the chemical solvents, the proportion of each component in the chemical materials is regulated according to the length of the soaking time, so that the light transmission rate of the photovoltaic layer material is as high as 76%. “

It is worth noting that the color saturation and preservation of this smart window have a color rendering index of up to 96, the average visible light contrast greater than 30%, and the height adaptability to the height of different solar radiation.

“The so -called adaptiveness means that smart windows can show different depths according to the intensity of different sunlight photos, and adjust the indoor lighting indoor lighting according to different weather -when the smart windows make the outdoor strong light transparent in less, this way It is not dazzling; in a cloudy day, let the light completely transparent to meet the needs of indoor lighting. “Liu You said.

The temperature control performance of the smart window is displayed. Interviewee confidence


This kind of smart window also has a regulatory function in the infrared light band, which can regulate infrared rays. The energy consumption demand for indoor air conditioners will help my country to achieve the long -term goal of carbon peaks and carbon neutrality. “Professor Qin Tianshi said.

“At present, we have designed the sample of the photovoltaic discoloration device. After 10,000 switch tests, the average visible light contrast of the device can still be maintained at the initial value, proving that the performance of our smart window is stable.” This result has a wide range of market prospects in construction, automobiles, high -speed rail, aircraft and other fields. In addition, compared to the current photosynthetic color change lens, the optical discoloration device has a faster response time and a wider dynamic range. It also has application potential in high -end fields such as anti -glare goggles and pilot visual helmets.

Edit: Zhang Shuang

Review: Yue Liang