Full-Stokes Polarization Emission and Detection of 2D Chiral Perovskites

Full-Stokes polarization emitters and detectors are critically required for the implementation of various functional schemes in 3D display, high-resolution radar, optical imaging, and quantum key distribution. In this report, we have synthesized the 2D chiral perovskites of individual (<i>S</i>- and <i>R</i>-MBA)₂PbI₄ microplates and characterized their polarization-related optical properties mainly at the cryogenic temperature of ∼4 K. On the one hand, these 2D chiral microplates demonstrate a photoluminescence spectrum with both linearly and circularly polarized components, which originate from the directional dipole moment and the helical crystal structure imparted by the Pb-I-Pb bonds and the chiral molecules, respectively. On the other hand, the second harmonic signals are generated from these 2D chiral microplates under both linearly and circularly polarized excitations, owing to the coexistence of electric and magnetic dipole moments in the underlying crystal lattice. The above findings reveal the capability of 2D chiral perovskites to emit and detect both linearly and circularly polarized lights, with their compactness in the microplate form being beneficial to the further development of on-chip full-Stokes polarization devices.