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Inter-NC anion-exchange reactions in CsPbX3 NC systems. (a) An overview of the PL spectra of samples obtained by mixing CsPbBr3 NCs with either CsPbCl3 or CsPbI3 NCs in various ratios. (b) Time-dependent PL spectra showing an intermediate stage formed during inter-NC anion-exchange between CsPbBr3 and CsPbI3 in which two distinct NC species coexist with altered compositions.
