One-pot and large-scale production of uniform ytterbium-doped perovskite nanocrystals with controllable optical properties

Yb-doped lead halide perovskite nanocrystals (NCs) have attracted significant attention due to their outstanding optical properties. However, scaling up the synthesis remains a practical challenge. Here, we present a scalable method for producing monodispersed Yb 3+ :CsPbCl 3 NCs by simply heating up mixed reactants. The particle size and Yb 3+ doping concentration of the produced CsPbCl 3 NCs can be effectively controlled. The resulting NCs exhibit exciton and Yb 3+ emissions, both can be fine-tuned by modifying the annealing temperature and duration. Unlike classical size evolution modes, we revealed that the monodispersity was attributed to a two-step nucleation and digestive ripening process. With the capability to yield over ten grams of high-quality Yb 3+ :CsPbCl 3 NCs, our work may suggest a synthetic approach for a wide range of applications and demonstrates an alternative mechanism for forming monodispersed perovskite NCs. Monodispersed Yb 3+ :CsPbCl 3 nanocrystals with tunable optical properties were synthesized via a scalable one-pot method. The mechanism of size evolution based on digestive ripening was proposed.