Confinement-Tunable Transition Dipole Moment Orientation in Perovskite Nanoplatelet Solids and Binary Blends
Tommaso Marcato, Frank Krumeich, and Chih-Jen Shih
ACS Nano 2022 16 (11), 18459-18471
Tuning the transition dipole moment (TDM) orientation in low-dimensional semiconductors is of fundamental and practical interest, as it enables high-efficiency nanophotonics and light-emitting diodes. However, despite recent progress in nanomaterials physics and chemistry, material systems that allow continuous tuning of the TDM orientation remain rare.
Here, combining k-space photoluminescence spectroscopy and multiscale modeling, we demonstrate that the TDM orientation in lead halide perovskite (LHP) nanoplatelet (NPL) solids is largely confinement-tunable through the NPL geometry that regulates the anisotropy of Bloch states, dielectric confinement, and exciton fine structure.
The experimental data were evaluated with the software Setfos provided by Fluxim.
The angle-dependent PL of the NPL film was characterized using the commercial instrument Phelos (Fluxim Inc.) equipped with a spectrometer, a linear polarizer, and a cylindrical macro extractor lens.