Low molecular weight molecule induces the effective stabilization of CsPbBr3 in water

The colloidal synthesis of nanoscale perovskites has generated intensive interests very recently and most of the preparation processes are performed in organic phases due to requirement of maintaining the stability. Since the exploration of CsPbX 3 assembly in aqueous medium is still rarely reported in recent years, we use the simple organic building block (2-methylimidazole, MEIM) for the first time to collect the mixture of two metal precursors (CsBr and PbBr 2 ) and CsPbBr 3 /MEIM nanocrystals have been perfectly formed with the aid of the effective organic layer in terms of coordination interactions with metal ions . Such lead halide perovskite material with diameters of 8–10 nm possesses stable and green-emitting feature in pure water. Extensive experimental conditions including reaction time, reagent ratio, addition sequence, pH/temperature dependence and solvent effect have been investigated in details. This study finds a new way to the controllable synthesis of perovskite nanoparticles in eco-friendly solvents and represents a next generation target material for utilization in opto-electronic fields.