Ultrathin Two‐Dimensional Organic–Inorganic Hybrid Perovskite Nanosheets with Bright, Tunable Photoluminescence and High Stability

• Published in: Angewandte Chemie International Edition Vol. 56; no. 15; pp. 4252 - 4255
• Main Authors: Yang, Shuang, Niu, Wenxin, Wang, An‐Liang, Fan, Zhanxi, Chen, Bo, Tan, Chaoliang, Lu, Qipeng, Zhang, Hua
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 03-04-2017
• Edition: International ed. in English
• Subjects: Dimensional stability; Lead; Lead compounds; Luminescence; Metal halides; Nanosheets; Optoelectronics; organometal halides; Perovskites; Photoluminescence; Photons; Solvents; stability; Synthesis; two-dimensional nanosheets; perovskites; photoluminescence; two-dimensional nanosheets; organometal halides; stability
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201701134

Two‐dimensional (2D) organic–inorganic hybrid perovskite nanosheets (NSs) are attracting increasing research interest due to their unique properties and promising applications. Here, for the first time, we report the facile synthesis of single‐ and few‐layer free‐standing phenylethylammonium lead halide perovskite NSs, that is, (PEA)2PbX4 (PEA=C8H9NH3, X=Cl, Br, I). Importantly, their lateral size can be tuned by changing solvents. Moreover, these ultrathin 2D perovskite NSs exhibit highly efficient and tunable photoluminescence, as well as superior stability. Our study provides a simple and general method for the controlled synthesis of 2D perovskite NSs, which may offer a new avenue for their fundamental studies and optoelectronic applications.
Ultrathin perovskite nanosheets: Single‐ and few‐layer free‐standing phenylethylammonium lead halide perovskite nanosheets with controlled lateral sizes were synthesized by a facile and fast crystallization method. These as‐prepared nanosheets show bright, tunable light emission (see picture) as well as enhanced stability.