Fe2+ doped in CsPbCl3 perovskite nanocrystals: impact on the luminescence and magnetic properties

Abstract

All inorganic halide perovskite nanocrystals (NCs) have wider practical applications owing to their good properties, whereas the photoluminescence quantum yield (PLQY) of the purple emissive CsPbCl₃ NCs is too low to apply in multi-color displays. In this study, earth-abundant Fe²⁺ metal ions were successfully incorporated into the lattice of CsPbCl₃ NCs with the partial replacement of the sites of Pb²⁺ ions. The impacts of Fe²⁺ ions on the luminescence and magnetic properties of CsPbCl₃ NCs were studied using photoluminescence spectroscopy (PL), X-ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), and a vibrating sample magnetometer (VSM). CsPb_1−xFe_xCl₃ NCs, with x = 0, 0.1, 0.2, and 0.3, were synthesized at 170 °C. It was found that an appropriate amount of Fe²⁺ doping not only improved the homogeneity of the size of NCs, but also enhanced the PLQY and average PL lifetimes. An obvious hysteresis behavior was observed for the NCs, and there was a significant change in the saturation magnetization value with the increase in the Fe²⁺ concentration.