Halogen atom tuning the fluorescence emission of atomically thin two-dimensional organic-inorganic perovskites

Organic-inorganic hybrid perovskite shows great application prospects in the field of luminescent material due to relatively high chemical stability and regulation of efficient luminescence performance. Here, a series of organic-inorganic hybrid perovskites (R-XPMA)2PbCl4 (R = 2,3,4 substituted, PMA = benzylamine, X = Cl, Br) were prepared. Through the change from the molecular level two-dimensional perovskite “thickness”, as well as the preparation of heterojunction composites, tunning of the optical properties of the perovskite was achieved. The experimental results show that the shift of the fluorescence emission was related to the species and positions of halogen atoms to a certain degree, providing new insight into the optical properties regulation of layered perovskite materials.