A Universal Approach for Controllable Synthesis of n-Specific Layered 2D Perovskite Nanoplates

2D perovskites with chemical formula A '(2)A(n-1)B(n)X(3n+1) have recently attracted considerable attention due to their tunable optical and electronic properties, which can be attained by varying the chemical composition. While high color-purity emitting perovskite nanomaterials have been accomplished through changing the halide composition, the preparation of single-phase, specific n-layer 2D perovskite nanomaterials is still pending because of the fast nucleation process of nanoparticles. We demonstrate a facile, rational and efficacious approach to synthesizing single-phase 2D perovskite nanoplates with a designated n number for both lead- and tin-based perovskites through kinetic control. Casting carboxylic acid additives in the reaction medium promotes selective formation of the kinetic product-multilayer 2D perovskite-in preference to the single-layer thermodynamic product. For the n-specific layered 2D perovskites, decreasing the number of octahedral layers per inorganic sheet leads to an increase of photoluminescence energy, radiative decay rate, and a significant boost in photostability.

Automated summary

Recent attention has been focused on 2D perovskites with tunable optical and electronic properties. By using kinetic control and adding carboxylic acid additives in the reaction, single-phase 2D perovskite nanoplates with a designated n number have been successfully synthesized, leading to enhanced photostability.