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The role of the magnetic field in the emission properties of CsPbBr3 perovskite nanocrystals is investigated using magnetic materials, La0.67Sr0.33Mn0.9Co0.1O3 and La0.67Sr0.33Mn0.9Ni0.1O3. The ferromagnetic–paramagnetic phase transition point of these magnetic materials is near room temperature, and the intensity of the magnetic field can be controlled by changing the temperature. An increase of 51% and 33% is observed in the emission intensity of the CsPbBr3 perovskites, on increasing the temperature from 10 °C to 35 °C, in the presence of La0.67Sr0.33Mn0.9Ni0.1O3 and La0.67Sr0.33Mn0.9Co0.1O3, respectively. At lower temperatures, the samples are magnetic due to their ferromagnetic nature, and on increasing the temperature, they become non-magnetic. Magnetic materials as well as CsPbBr3 nanocrystals possess perovskite crystal structure, and this might be playing an important role in transmitting the magnetic field. By understanding the role of the magnetic field in the emission of CsPbBr3 perovskite nanocrystals, magnetic materials can be used to control the properties of CsPbBr3 nanocrystals for light energy harvesting and opto-electronic applications.