Fluorescent switches have displayed many applications in the field of materials. In this work, we reported a photochromic dithienylethene containing a dansyl-based fluorescent dye, and investigated its photochromism and optical properties. Under the alternating irradiation of UV and visible light, it exhibited good photochromism and switchable fluorescence behavior in solution and in solid state. Interestingly, this fluorescent switch can be applied in the photo-responsive writing. It was worth mentioning that this dithienylethene was also used a photochromic indicator to carry out the fluorescent bioimaging in living cells and in vivo.

中文翻译：

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多媒体中基于二噻吩乙烯和丹磺酰胺的荧光开关

荧光开关在材料领域已显示出许多应用。在这项工作中，我们报告了包含基于丹磺酰基的荧光染料的光致变色二噻吩乙烯，并研究了其光致变色和光学性质。在紫外线和可见光的交替照射下，它在溶液和固态下均表现出良好的光致变色性和可切换的荧光行为。有趣的是，该荧光开关可以应用于光敏笔迹中。值得一提的是，该二噻吩基乙烯还被用作光致变色指示剂，以在活细胞和体内进行荧光生物成像。