Fig. 3
a Fluorescence emission spectra of ratiometric fluorescent probe respond to different concentrations of BH (from 0 to 200 μM) (insets showed the fluorescence color change under a 365-nm UV lamp in the presence of 50 μM BH (right) and blank (left)), b fluorescence intensity of ratiometric fluorescent probe changed in the range of 0–200 μM BH (insert: linear relationship between the fluorescent ratio of I525/I630 and the BH concentrations). The color change of the sensing sensor responds to different BH concentrations (0, 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1, 2, 3, 4, 5 μM) c under daylight and d a 365-nm UV lamp