Tuning optical properties and optical rotation of 3-mercaptopropionic acid capped organic–inorganic hybrid perovskites

The emission wavelength of organic–inorganic hybrid perovskite quantum dots (QDs) can be tuned by controlling reaction time relevant to the halide exchange. It is because halide exchange with different time would lead to different molar ratio of halides in perovskite QDs such as Cl and Br. Here, to research the ligand's effect on the halide exchange, this work synthesized 3-mercaptopropionic acid (MPA)-capped CH 3 NH 3 PbBr x Cl 3-x QDs. It was found that SH − of MPA appeared to inhibit the halide exchange during the reation. Moreover, although the MPA-capped CH 3 NH 3 PbBr x Cl 3-x QDs did not contain the chiral centre, they exhibit the optical rotation. This may provide a method for chirality manipulation of perovskite.