Light-Driven Intraoctahedral Halide Isomerization in Two-Dimensional Mixed Halide Perovskites.

ABSTRACT: Two-dimensional metal halide perovskites are emerging materials for quantum light emission and neuromorphic computing owing to their quantum-confined structures and tunable optoelectronic properties. Beyond structural dimensionality, the presence of multiple crystallographically distinct halide sites within a single metal halide octahedron presents a unique opportunity to engineer functionality at the subunit-cell level. Here, we report a light-driven, reversible halide-ion isomerization in single-crystalline BA₂PbBr_xI_4-x (BA = butylammonium, x = 1-3), where ions switch between distinct local configurations within individual PbX₆^4- octahedra, without long-range migration or macroscopic phase segregation. Through a

SUBMITTER: Mao W 

PROVIDER: S-EPMC12856884 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature