Probing molecule-like isolated octahedra via-phase stabilization of zero-dimensional cesium lead halide nanocrystals.

ABSTRACT: Zero-dimensional (0D) inorganic perovskites have recently emerged as an interesting class of material owing to their intrinsic Pb²⁺ emission, polaron formation, and large exciton binding energy. They have a unique quantum-confined structure, originating from the complete isolation of octahedra exhibiting single-molecule behavior. Herein, we probe the optical behavior of single-molecule-like isolated octahedra in 0D Cesium lead halide (Cs₄PbX₆, X?=?Cl, Br/Cl, Br) nanocrystals through isovalent manganese doping at lead sites. The incorporation of manganese induced phase stabilization of 0D Cs₄PbX₆ over CsPbX₃ by lowering the symmetry of PbX₆ via enhanced octahedral distortion. This approach enables the synthesis of CsPbX₃ free Cs₄PbX₆ nanocrystals. A high photoluminescence quantum yield for manganese emission was obtained in colloidal (29%) and solid (21%, powder) forms. These performances can be attributed to structure-induced confinement effects, which enhance the energy transfer from localized host exciton states to Mn²⁺ dopant within the isolated octahedra.

SUBMITTER: Arunkumar P 

PROVIDER: S-EPMC6224409 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature