After 6 min of illumination, the fitting has to be done with consideration of the contribution of Pb, which indicates increased decomposition. It is important to note that the nuclear spin of H is like the nuclear spin value of Pb (spin = ½). Hence, there is a possibility that some of the contributions that we see at the beginning of the HPs decomposition are from the conventional BMPO/•OH and BMPO/•OOH adducts and not only from Pb. Similar EPR analysis of the Cs4PbBr6 NCs spectra reveals that the decomposition starts only after 18 min of illumination, and the signals of Cs, Pb, and Br can be detected. Notably, the Br-related radical species contribute substantially to the EPR spectra for both solutions, i.e., aBr is 0.517 for Sol. 1 and 0.677 for Sol. 2 (Tables and).