<p>Colloidal quantum dots of mixed-halide perovskite CsPb_0.8Nd_0.2BrCl₂ containing Nd³⁺ ions have been synthesized and characterized. These nanocrystals were obtained by hot injection followed by purification and transfer to a stable organic dispersion, which provides for the reproducible formation of Nd-containing particles with persistent colloidal stability. The samples exhibited intense blue photoluminescence with a maximum at 457–458 nm and a narrow emission band. The excitation–emission matrix showed that the position of the luminescence band remains virtually unchanged upon variation of the excitation wavelength, indicating the relative homogeneity of the emitting states. The decay kinetics is described by a monoexponential curve with a characteristic time of 6.7 ns. The photoluminescence quantum yield indicates a fairly high proportion of radiative recombination. Morphological analysis, DLS and EDX mapping all confirm the formation of nanoparticles containing the major elements of the initial composition including neodymium. The combined chloride substitution and introduction of Nd³⁺ ions is shown to be an effective approach to obtaining blue-emitting perovskite nanocrystals, which hold promise for use in optoelectronics, photonics, and scintillation applications.</p>