Hsu Chien-Wei, Sauvée Claire, Sundén Henrik, Andréasson Joakim
Chalmers University of Technology , Department of Chemistry and Chemical Engineering , Chemistry and Biochemistyry , Kemivägen 10 , 412 96 , Göteborg , Sweden . Email:
Chem Sci. 2018 Sep 4;9(41):8019-8023. doi: 10.1039/c8sc03127d. eCollection 2018 Nov 7.
A facile cocktail approach implying the mixing of diarylethene () photoswitches and low molecular weight gelators (LMWG) is presented. The photoresponsive gels exhibit multicolored emission that can be precisely controlled by different light exposure schemes (wavelength and dose), applicable for fluorescence patterning/writing. Including also a blue-emitting fluorophore allows for tri-chromatic color tuning of the emission multistep energy transfer reactions, which in turn yields a non-linear response between the emission spectra and the light dose. This feature is highly desired in data security and anti-counterfeiting contexts. The information written in the gels can be conveniently erased by light, mass diffusion, or shaking; the latter being due to the thixotropic properties of the gels.
本文提出了一种简便的混合方法，即将二芳基乙烯（）光开关与低分子量凝胶剂（LMWG）混合。这种光响应凝胶呈现出多色发射，可通过不同的光照方案（波长和剂量）精确控制，适用于荧光图案化/书写。加入蓝色发射荧光团可实现发射的三色颜色调节——多步能量转移反应，进而在发射光谱和光剂量之间产生非线性响应。在数据安全和防伪领域，这一特性是非常需要的。凝胶中写入的信息可以通过光照、质量扩散或摇晃方便地擦除；后者是由于凝胶的触变性。
