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UV–vis spectrum of (a) trans- and cis-AzoFL, (b) trans- and cis-DZ, (c) trans- and cis-DFDZ (inset: UV–vis peak of cis-DFDZ: half-width at half height 0.033 eV), and (d) FL (inset: UV–vis peak of FL UV–vis peak: peak half-width at half height 0.033 eV) obtained by TD-DFT/B3LYP/6-31+G(d,p) calculation. The calculated UV–vis spectra are represented with a Gaussian UV–vis peak half-width at half height 0.333 eV.
