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

Herein, by using different size of organic molecules as cation templates, we prepared four new two-dimensional (2D) lead halide perovskites, [PrPipz]PbBr 4 ( 1 ), [DMEDA]PbBr 4 ( 2 ), [TMEDA] 0.5 [DMA]PbCl 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.