Through the cooperated works with companies in developing new chromogenic materials that can be deposited below 150oC, we successfully demonstrate the flexible photochromic film that can reversibly tune its transmittance in response to sun light. While it has an average transmittance of 70% at 600 ~ 700nm at its original state, it turns to greenish blue with 20% transmittance at 600 ~ 700nm upon exposure to sunlight. As the previously fabricated photochromic glass, photo-switching time of this photochromic films are not affected by their dimension. Switching time for coloring and bleaching is not the same. While the former is about 5min, the latter takes much longer time, about 5 hours. Now we focus on optimizing switching time for bleaching under dark condition by carefully tuning material’s composition. Our photochromic film does not need external power to operate that can greatly reduce expenditure of installation and maintenance.
Primary Application Area: Energy, Efficiency, Environmental
Technology Development Status: Proven Manufacturability
Technology Readiness Level: TRL 5
Organization Type: Academic/Gov Lab
Showcase Booth #: 423
GOVT/EXTERNAL FUNDING SOURCES