Spin chiral anisotropy (SChA) refers to the occurrence of different spin polarization in antipodal chiral structures. Herein, we report the SChA in diamagnetic chiral mesostructured In₂O₃ films (CMIFs) with manifestation of chirality-dependent magnetic circular dichroism (MCD) signals. CMIFs were grown on fluorine-doped tin dioxide conductive glass (FTO) substrates, which were synthesized via a hydrothermal route, with malic acid used as the symmetry-breaking agent. Two levels of chirality have been identified in CMIFs: primary nanoflakes with atomically twisted crystal lattices and secondary helical stacking of the nanoflakes. CMIFs exhibit chirality-dependent asymmetric MCD signals due to the different interactions of chirality-induced effective magnetic field and external magnetic field, which distinguish from the commonly observed external magnetic field-dependent symmetric MCD signals. These findings provide insights into spin manipulation of spin-paired diamagnets.

The chirality-induced spin selectivity (CISS) has been found in the antiferromagnetic and paramagnetic chiral inorganic materials with unpaired electrons, while rarely reported in the spin-paired diamagnetic inorganic materials with spin-pairing energy. Here, we report the CISS in the spin-paired diamagnetic BiOBr endowed with three levels of chiral mesostructures. Chiral mesostructured BiOBr films (CMBFs) were fabricated through a sugar alcohol-induced hydrothermal route. The antipodal CMBFs exhibited chirality-dependent, magnetic field-independent magnetic circular dichroism (MCD) signals, which indicates the existence of spin selectivity. The spin selectivity of CMBFs was speculated to be the result of the competing effect between the externally applied magnetic field and the effective magnetic field arisen from the spin electron motions in chiral potential. The chirality-induced effective magnetic field acts on the magnetic moment of electrons, potentially overcoming the spin-pairing energy and producing opposite energy changes for spin-down and spin-up electrons.

Chiral quantum dot (in rod)-light-emitting diodes (CQLEDs) with circularly polarized electroluminescence (CPEL) have driven interest in the future display, communication, and storage industries. However, the preparation of CQLEDs is still a challenging unresolved. Herein, we fabricated CQLEDs through spin-coating evaporation of chiral CdSe/CdS quantum rods (CCCQs) colloidal solution on indium tin oxide substrate. The CCCQs were synthesized via an isotropically epitaxial growth with cholic acid as the symmetry breaking agent, which induced one-direction chiral dislocation around the c axis of their hexagonal crystal structure. The CCCQs were ranked side-by-side in right-handed chiral arrangement with helical axis perpendicular to substrate due to chiral driving force of the cholic acid arrangement. The CQLEDs exhibited a negative CPEL signal at 600 nm with a |g_EL| of 2 × 10⁻⁴, which is ascribable to the selective filtration on emission arising from the circular Bragg resonance by quasi-photonic crystal structures.