Ultra-stable Mn-doped perovskite-related tetragonal CsPb2Cl5 nanosheets with bright luminescence and strong antiferromagnetism

Metal ion doped semiconductor nanocrystals have attracted broad interest due to the doping ions could tailor their optical, electronic, transport, structure stability and spintronic properties. Herein, we report a novel ligand-mediated solvent-induced reprecipitation approach to synthesize stable and highly fluorescent thiol-passivated Mn-doped perovskite-related tetragonal CsPb 2 Cl 5 nanosheets (NSs). The rational tuning the chemical composition ( i.e. , Pb/Mn ratio) and controlling the crystal phase of the CsPb 2−x Mn x Cl 5 perovskite NSs have been achieved. Significantly, their crystal structure and photoluminescence properties are found to be well-reserved for over two months under ambient conditions. With the addition of Mn 2+ , the PL lifetime of CsPb 2 Cl 5 decreases, which further confirms the energy transfer of CsPb 2 Cl 5 to Mn 2+ , and energy transfer efficiency (η ET ) from CsPb 2 Cl 5 to Mn 2+ in CsPb 2−x Mn x Cl 5 NSs is as high as 54.9 %. Furthermore, benefited from the Mn 2+ doping, the antiferromagnetic fitting temperature of the NSs is −5 K, which indicates a strong antiferromagnetic coupling. This work suggests an expansive research prospect for application of metal ion doped perovskite-related materials in the field of optical, magnetic, and optoelectronics devices.