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Overview of transformation reactions of Cs4PbBr6 into CsPbBr3 and back. (a) Proposed reaction mechanisms for the exchange reaction via the extraction of CsBr or the insertion of PbBr2. (b) TEM image showing the preservation of NC size from Cs4PbBr6 NCs to CsPbBr3 NCs, adapted from ref (13). (c) First excitonic absorption peak and (d) XRD pattern of NCs after several reversible exchanges from CsPbBr3 to Cs4PbBr6 and back, adapted from ref (37).
