The cation–anion co-exchange in CsPb1−xFex(Br1−yCly)3 nanocrystals prepared using a hot injection method

Abstract

All inorganic perovskite nanocrystals (NCs) have wide practical applications for their remarkable optoelectronic properties. To obtain blue-emitting perovskites with high photoluminescence quantum yield and room-temperature ferromagnetism, CsPb_1−xFe_x(Br_1−yCl_y)₃ NCs were synthesized using a hot injection method. The effects of the cation–anion co-exchange on the structural, luminescent and magnetic properties of CsPbBr₃ NCs were studied by X-ray diffraction spectroscopy, photoluminescence spectroscopy, transmission electron microscopy, field emission scanning electron microscopy, and vibrating sample magnetometer. The results indicated that there was cation–anion co-exchange in CsPb_1−xFe_x(Br_1−yCl_y)₃ NCs, while the band-edge energies and PLQY were mainly affected by the anion exchange. The ferromagnetism of CsPb_1−xFe_x(Br_1−yCl_y)₃ NCs had been observed at room temperature, and there was an increase in saturation magnetization with increasing Fe concentration.