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(a) PL spectra before and after cation exchange within FAPbI3 NCs (or CsPbI3 NCs) using Cs-oleate (or FA-oleate). (b) PL spectra before and after anion exchange of FAPbI3 NCs using OAm+Br– (or OAm+I–) showing the possibility of tuning the band gap from 570 to 780 nm.
