Lin Jin-Tai, Chen Deng-Gao, Wu Cheng-Ham, Hsu Chia-Shuo, Chien Chia-Ying, Chen Hao-Ming, Chou Pi-Tai, Chiu Ching-Wen
Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan.
Instrumentation Center, National Taiwan University, Taipei, 10617, Taiwan.
Angew Chem Int Ed Engl. 2021 Mar 29;60(14):7866-7872. doi: 10.1002/anie.202016140. Epub 2021 Mar 1.
2D perovskites with chemical formula A' A B X 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.
