Here, we synthesized a pair of chiral two-dimensional lead bromide perovskites -/-(CHNF)PbBr (1R/2S) using a H/F substitution strategy, which exhibit circular dichroism (CD) and circularly polarized luminescence (CPL) activity. Compared with one-dimensional non-centrosymmetric (CHN)PbBr with local asymmetry obtained by isopropylamine, 1R/2S show a centrosymmetric inorganic layer despite the global chiral space group. Density functional theory calculations show that the formation energy of 1R/2S is lower than that of (CHN)PbBr, which implies the improved moisture stability in photophysical properties and CPL activity.
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