The fluorescence spectrum of the blue LED light is shown in Fig. 1A. Following photolysis, the Protoporphyrin IX (PpIX) spectrum has three peaks: 601.09, 635.77, and 703.76 nm, and the highest peak is at 703.76 nm (Fig. 1B).Figure 1(A) Relative spectral emission curve from LED and (B) relative spectral fluorescence of PpIX with blue light irradiation.