Structural Evolution and Photoluminescence Properties of Two‐dimensional Lead Halide Perovskites

Abstract Herein, by using different size of organic molecules as cation templates, we prepared four new two‐dimensional (2D) lead halide perovskites, PrPipzPbBr 4 ( 1 ), DMEDAPbBr 4 ( 2 ), TMEDA 0.5 DMAPbCl 4 ( 3 ) and TMA 4 Pb 3 Cl 10 ( 4 ). Under the distinct structural directing effects of organic cations, compounds 1–4 present four different types of 2D inorganic layers. Remarkably, compounds 1 , 3 and 4 exhibit broadband blue emissions, while compound 2 exhibits broadband yellow emission upon the excitation of UV light at room temperature. This work paves a way to modulate the crystal structure and photoluminescent property of low‐dimensional halide perovskite via structural modulation strategy from the molecular level.