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Topotactic anion exchange has been developed to tune the composition and band gap energies of cesium lead halide (CsPbX 3 ) perovskite nanocrystals (NCs). However, current anion exchange methods either require harsh conditions or take a long time to realize substantial substitution. Here, we present a method to modulate the composition of colloidal CsPbBr 3  NCs through ultrasonication-assisted anion exchange with CsX (X = Cl, I) solution. Efficient anion exchange of CsPbBr 3  NCs with Cl −  or I −  is realized with substitution ratio up to 93% and preservation of the pristine shape and structure of CsPbBr 3  NCs. This anion exchange results in tunable emission, covering the whole visible spectral range, with relatively high photoluminescence quantum yield, narrow emission bandwidths, and good stability. This work provides a facile and efficient way to engineer the properties of halide perovskite NCs and has great potential for large-scale production of compositionally diverse perovskite NCs.   Electronic supplementary material  The online version of this article (10.1186/s11671-018-2592-4) contains supplementary material, which is available to authorized users.

Tuning the Optical Properties of CsPbBr3 Nanocrystals by Anion Exchange Reactions with CsX Aqueous Solution