1 Department of Chemistry and Biochemistry, Centre for NanoScience Research, Concordia University, 7141 Sherbrooke Street West, Montreal, Quebec, H4B 1R6, Canada. marek.majewski@concordia.ca.

The self-assembly of CsPbCl₃ perovskite nanocrystals and their Mn²⁺-enriched analogs into supercrystals is reported. Increasing Mn²⁺ content in the nanocrystals leads to formation of larger, increasingly uniform cubic supercrystals that eventually become rod-like with higher photoluminescence quantum yields.