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(a) PL spectra of colloidal CsxFA1–xPb(Br1–yIy)3 NCs synthesized using the microfluidic platform and exhibiting composition-tunable band-gap energies between 690 and 780 nm with fwhm values of 40–65 nm and (b) representative online PL and in online absorption spectra at different quantities of Cs+ and Br– in the reaction mixture.
