Lasing from Chiral Microstructures Self-Assembled from Perovskite Quantum Dots
DescriptionThe design and fabrication of novel cavity structures represents one research frontier in the field of semiconductor nanolasers and nanophotonics, which will enable the development of miniaturized halide perovskite lasers. As the self-organized perovskite microcavity evolves from 1D (one-dimensional) to 2D (two-dimensional) and 3D (three-dimensional) structures, high-performance lasing can emerge. Perovskite chiral microstructures in the shape of a 3D microcavity have yet to be demonstrated, and may provide novel lasing mechanisms and properties and thus advance the basic research and applications of perovskite-based lasers.Herein, we propose to fabricate perovskite chiral microstructures through the self-assembly of chiral perovskite quantum dots (QDs), and to study their lasing resonance mechanism and properties. The controlled synthesis of 3D chiral microstructures is mainly limited by centrosymmetric configurations of the perovskite crystal lattice. Therefore, we will first synthesize chiral perovskite QDs by incorporating them with chiral ligands to obtain chiral microstructures through the asymmetric packing of chiral QDs. The crystal structure, morphology and optical activity of chiral QDs will be characterized by transmission electron microscopy and circular dichroism spectroscopy in order to analyze structural configurations of chiral QDs and uncover the origin of their chirality. Density functional theory calculations and time-resolved photoluminescence measurements will be carried out to clarify the influenceof chirality on electronic structures and the carrier dynamics of the perovskite QDs. The morphology and optical activity of the perovskite chiral microstructures will also be analyzed to clarify the mechanism of asymmetric self-assembly and the possible occurrence of chiral amplification. Finally, optically pumped lasing experiments will be carried out on a confocal micro-photoluminescence system in order to study the lasing mechanism and properties of perovskite chiral microstructures, especially circularly polarized lasing. Finite-difference timedomain simulations will be performed to simulate the electric field distribution and thus to analyze the optical path and resonance mechanism of a chiral optical cavity. In summary, this project will provide an avenue to fabricate high-quality chiral microcavities through the perovskite QDs’ self-assembly and systematically analyze the lasing mechanisms and properties of these chiral structures both in theory and experiment.We will determine the origin of chirality in these QDs and their self-assembled microstructures, and clarify the influence of chirality on crystal lattice, morphology, electronic structures, carrier dynamics and optical properties, which will guide the design and fabrication of chiral perovskites for a variety ofpractical applications.
|Effective start/end date||1/01/23 → …|