Figure 6

(a) Schematic representation of CH₃NH₃PbBr₃ nanoplatelets with different number of layers (n=1,2,3 and ∞). The number of layers decreased with increasing octylamine (OA) content in the reaction mixture. (b) UV-visible and PL spectra of CH₃NH₃PbBr₃ perovskite films prepared from the colloidal NC suspensions synthesized using different amounts of OA (0–100%), with photographs of the respective solutions under UV light. Adapted from Sichert et al.²⁵ (c) UV-visible (solid lines) and PL (dashed lines) spectra of CsPbBr₃ nanocubes and nanoplatelets made of 1–5 unit cells. (d, e) TEM images of CsPbBr₃ NCs synthesized at 150 °C (green emitting nanocubes) and 90 °C (blue emitting thin nanoplatelets), respectively. The insets show photographs of the respective solutions under UV light. Reproduced from Bekenstein et al.⁹²