Figure 1.

Synthesis procedure for forming chiral perovskite QDs. Achiral CsPbBr₃ quantum dots are prepared by hot injection of Cs oleate into a solution of PbBr₂, ZnBr₂, oleylamine, and oleic acid in octadecene, yielding particles approximately 2 nm in diameter that are decorated with oleylamine and oleate ligands. As in our previous work^20,29, ZnBr₂ is used in large excess to increase the chemical potential of Br⁻ during synthesis, which helps to maintain a small particle diameter, as reported by Dong et al.³². To imprint chirality onto the particles, chiral R- or S-4-X-phenethylammonium bromide is introduced to the dispersions and incubated for 2 h, during which the chiral ligands mostly displace the native oleylammonium and oleate ligands.