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(A) PL spectra of the CsPb(Br:X)3 (X = Cl, I) NCs prepared by anion exchange from CsPbBr3 NCs. (B) PL calibration curves: a targeted emission energy could be obtained by adding a precise amount of halide precursor to a crude solution of CsPbBr3 NCs. The curves are reported as a function of the molar ratio between the added halide (or exchange halide) and the Br amount in the starting NCs. (C) PLQY recorded on the exchanged NCs (dots) as well as on the directly synthesized NCs (stars).
