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

• Published in: Angewandte Chemie International Edition Vol. 60; no. 14; pp. 7866 - 7872
• Main Authors: Lin, Jin‐Tai, Chen, Deng‐Gao, Wu, Cheng‐Ham, Hsu, Chia‐Shuo, Chien, Chia‐Ying, Chen, Hao‐Ming, Chou, Pi‐Tai, Chiu, Ching‐Wen
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 29.03.2021
• Edition: International ed. in English
• Subjects: Additives; Carboxylic acids; Chemical composition; Decay rate; emission tunability; kinetic control; multilayer structures; Multilayers; Nanomaterials; Nanoparticles; Nanotechnology; Nucleation; Optical properties; Perovskites; Photoluminescence; Photons; Stability; Tin; kinetic control; nanomaterials; emission tunability; multilayer structures
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202016140

2D perovskites with chemical formula A′2An−1BnX3n+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. Single‐phase 2D lead‐ and tin‐based perovskite nanoplates with a designated n value can be successfully prepared through kinetic control of the nucleation process. This approach can effectively avoid the multipeak photoluminescence generally observed in multilayer 2D perovskite nanomaterials.