| الملخص: | Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd<sup>2+</sup> doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr<sub>3</sub> NCs. Cd<sup>2+</sup> doping results in a two-photon absorption cross-section, reaching 2.6 × 10<sup>6</sup> Goeppert-Mayer (GM), which is among the highest reported for CsPbBr<sub>3</sub> NCs.
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