Photochromic materials are widely applied in many fields, but their applications are partly limited by the complexity in both synthesis and device-fabrication, as well as the difficulty in quantitative analysis. We developed a photochromic compound (DHAIA) capable of changing color and fluorescence upon UV radiation. The change can be quantitatively analyzed via CIELAB color space, further yielding color shift (Delta E-Lab) values that can be either recognized by instruments or detected by naked eyes. The compound can be fabricated into a photo-responsive film to serve as a sensitive UV sensor, allowing a low detection limit down to 20 mu W/cm(2) (UV radiation intensity). In addition, a photo-patterning technique was demonstrated, wherein patterns can be printed using either UV light or sunlight.
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