As a reference, we tested Sol. 1 and 2 without HPs, both in the dark and under illumination, to confirm that solvent reactions do not generate radicals that could influence the decomposition of CsPbBr₃ and Cs₄PbBr₆ NCs (Figures and). Only a small amount of radicals formed after 24 min of illumination, allowing us to attribute our results primarily to radicals produced by the HPs under illumination.