Lanthanide Double Perovskite Nanocrystals with Emissions Covering the UV‐C to NIR Spectral Range

Abstract Lead halide perovskite nanocrystals (NCs) have recently drawn considerable attention in the fields of materials science and nanotechnology. However, a major drawback these NCs is reliance on toxic lead, which hinders widespread application. Herein, new class lead‐free NCs, that is, lanthanide double (Ln‐DP) with f‐orbital‐induced optical properties, introduced. The Pr‐, Ce‐, Tb‐, Eu‐, Sm‐, Yb‐based Ln‐DP display narrow d→f f→f emissions ranging from UV‐C to near‐infrared spectral region. Experimental data calculations reveal emissive exhibit small molecule‐like electronic absorptions: f→d atomic transitions or ligand‐to‐metal charge transfer transitions. Last, it demonstrated by alloying Ln compositions DP unique improved properties can be obtained. These are promising for sensing lighting, as components optoelectronic and/or magneto‐fluorescent devices.