The proximity of the PNPls in their stacks, both in solid state or in colloidal dispersions, will influence on their charge carriers and exciton dynamics due to FRET. To discuss this influence, we considered a donor acceptor system comprised of an n = 2 nanoplate (donor) and an n = 3 nanoplate (acceptor) for CsPbBr3. We, then, calculated the molar extinction coefficient for the acceptor species by measuring its absorption cross-section at 3.1 eV (see Supplementary Text for details). With this information, we estimate the Förster distance (R0), which is the distance for which FRET efficiency is 50%: