Two types of circularly polarized luminescence（CPL）exist：left-rotating and right-rotating luminescence. In the solid state, the external environment of the luminophores differs from the solution state. The properties of CPL are different from those of the solution state because the molecular motion of the luminophore is inhibited and intermolecular interactions occur. As an external environment, a magnetic field can also produce CPL from optically inactive luminophores. This paper describes these specific CPL properties.

The emergence of the chiral-induced spin-selectivity effect offers a new avenue for chiral organic molecules to autonomously manipulate spin configurations, thereby opening up possibilities in spintronics and spin-dependent electrochemical applications. In this study, a promising chiral van der Waals superlattice is synthesized via electrochemical intercalation of chiral molecules into a van der Waals layered material. Multiple tunneling processes within the highly ordered chiral layered structure of chiral TiS₂ superlattices result in an exceptionally high spin polarization exceeding 90％. The combination of metallic conductivity and high spin polarization sets the stage for the development of a new generation of CISS materials, enabling a wide range of electron spin-based applications.

Despite many attempt to realize efficient anhydrous organic proton conductors, materials design guidelines have yet been established because of the lack of our knowledge about the mechanism. In this paper, our recent progress on understanding anhydrous proton conduction focusing on molecular rotational motions in organic crystalline solids is introduced.

The mechanism of negative thermal expansion （NTE） in molecular crystals is not well understood due to the wide variety of factors involved. On the other hand, the involvement of diverse factors suggests that NTE can be hybridized with other physical properties. Molecular motion in crystals can be a factor of NTE through increasing entropy, which is difficult to realize. As an effective way to achieve molecular motion in crystals, we propose a supramolecular approach. In this paper, we introduce uniaxial and multiaxial NTE based on the supramolecular approach, relaxor ferroelectricity associated with molecular motion and unique magnetic properties due to molecular rearrangements associated with NTE.

In the chiral molecule-introduced ferromagnetic two-dimensional organic-inorganic hybrid perovskite copper halides, nonreciprocal directional dichroism has been observed and tuning of the strength of spin-orbit interaction has been achieved. As demonstrated in our studies, inversion symmetry-controllable organic-inorganic hybrid compounds should be promising platforms for developing novel quantum phenomena.