Effect of PbSO4-Oleate Coverage on Cesium Lead Halide Perovskite Quantum Dots to Control Halide Exchange Kinetics.

ABSTRACT: The selective control of halide ion exchange in metal halide perovskite quantum dots (PQDs) plays an important role in determining their band gap and composition. In this study, CsPbX3 (X = Cl-, Br-, and I-) PQDs were self-assembled with PbSO4-oleate to form a peapod-like morphology to selectively control halide ion exchange. Considering the distinct absorption and bright luminescence characteristics of these PQDs, in situ UV-Vis. absorption and fluorescence spectroscopies were employed to monitor the time-dependent band gap and compositional changes of the PQDs. We determined that the halide exchange in the capped PQDs is hindered-unlike the rapid anion exchange in noncapped PQDs-by a reduction in the halide exchange kinetic rate depending on the extent of coverage of the PQDs. Thus, we t

SUBMITTER: Woo Y 

PROVIDER: S-EPMC8538890 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature