Ligand-Assisted Reprecipitation of Highly Luminescent Perovskite Nanocrystals

Ligand-assisted reprecipitation (LARP) is a facile room-temperature synthesis method suitable for the mass production of perovskite nanocrystals (NCs). However, it encounters serious problems such as low product yields and poor quality. Here, a polymer ligand (P-AMDL) is designed and synthesized composed of four monomers of 2-acrylamido-2-methylpropanesulfonic acid (A), methyl methacrylate (M), 2-(dimethylamino) ethyl methacrylate (D), and lauryl methacrylate (L). Sulfonic acid groups, amide groups, and ester groups provide multiple binding sites for P-AMDL, and long alkyl chains can improve the hydrophobicity and redispersion ability. CsPbBr₃ NCs of high quality (PLQY > 90%) are synthesized by P-AMDL-assisted reprecipitation in toluene. Even at a high proportion of precursor/toluene (∼1/1 v/v), CsPbBr₃ NCs are still obtained in high yield, which is conducive to reducing the use of organic solvents. A scale-up synthesis of well-dispersed CsPbBr₃ NCs proves that P-AMDL can avoid a wide particle size distribution caused by mixing and diffusion. After having been stored in the solid state for 100 days, P-AMDL-stabilized CsPbBr₃ NCs can still be redispersible in toluene and recover the original PL properties (PLQY > 90%), which provides a safe and convenient way for solid storage and transportation of CsPbBr₃ NCs.