| Summary: | The doping of impurity ions into perovskite lattices has been scrupulously developed as a promising method to stabilize the crystallographic structure and modulate the optoelectronic properties. However, the photoluminescence (PL) of Fe<sup>2+</sup>-doped mixed halide perovskite NCs is still relatively unexplored. In this work, the Fe<sup>2+</sup>-doped CsPb(Cl<sub>x</sub>Br<sub>1−x</sub>)<sub>3</sub> nanocrystals (NCs) are prepared by a hot injection method. In addition, their optical absorption, photoluminescence (PL), PL lifetimes, and photostabilities are compared with those of undoped CsPb(Br<sub>1−x</sub>Cl<sub>x</sub>)<sub>3</sub> NCs. We find the Fe<sup>2+</sup> doping results in the redshift of the absorption edge and PL. Moreover, the full width at half maximums (FWHMs) are decreased, PL quantum yields (QYs) are improved, and PL lifetimes are extended, suggesting the defect density is reduced by the Fe<sup>2+</sup> doping. Moreover, the photostability is significantly improved after the Fe<sup>2+</sup> doping. Therefore, this work reveals that Fe<sup>2+</sup> doping is a very promising approach to modulate the optical properties of mixed halide perovskite NCs.
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