Zwitterionic Ligand Synthesis. The following DCzGPC ligand was synthesized using a modified literature method for the Yamaguchi-esterification. A solution of 3-Carbazol-9-yl-propionic acid (220.1 mg, 0.92 mmol) in 12 mL anhydrous dichlormethane (DCM) was treated with sn-Glycero- mg/mL DCzGPC solution were mixed with a magnetic stir bar for 5 min to exchange the native ligands. After adding the ligand solution, the mixture became turbid and the resulting exchanged NCs could be precipitated at 7000 rpm using twice the volume of hexane. The precipitate could be redispersed in chloroform, ethyl acetate, chlorobenzene or tetrahydrofuran to obtain a colloidal solution. All CsPbBr2Cl NC solutions were kept in a nitrogen-filled glovebox and exhibited stable luminescence for at least 4 months at room temperature.