Figure 7
(a) The confocal fluorescence image detected at 650 nm with the bandwidth of 15 nm. Inset: the emission spectrum of ROI (the white circle area) was also monitored from 630 to 690 nm with step of 10 nm and bandwidth of 15 nm. (b) The emission intensity of ROI changes as the concentration of oxygen changes. The scale bar is 100 μm.
