Circularly polarized luminescence (CPL) from semiconductor nanomaterials has emerged as a promising phenomenon for next-generation photonic technologies, including advanced displays, optical data transmission, and chiral sensing. Among the various emissive nanomaterials, perovskite nanocrystals (PNCs) are particularly attractive due to their exceptional optoelectronic properties. They exhibit high photoluminescence quantum yields, narrow emission bands, and facile spectral tunability across the entire visible range. Despite these advantages, achieving strong CPL from PNC-based systems remains challenging. In most reported approaches, the dissymmetry factor of luminescence is relatively low. Therefore, developing strategies that enable efficient CPL generation across the full visible spectrum remains an important goal.

In this work, we address these challenges by exploiting interactions between achiral PNCs and chiral organic templates [1]. Our approach relies on introducing nanocrystals into a chiral liquid-crystalline environment that provides a hierarchical supramolecular structure capable of transferring chirality to the emissive nanomaterial. To demonstrate the generality of this concept, we investigated three types of PNCs emitting in the red, green, and blue spectral regions. The nanocrystals were incorporated into a chiral liquid-crystalline matrix to form composite thin films, enabling controlled organization of the particles within the chiral host.

Structural characterization using electron microscopy revealed that the nanocrystals are not randomly dispersed within the matrix but instead assemble within nanoscale gaps created by the self-organized liquid-crystalline structure. These confined regions serve as templating sites that promote spatial ordering of the PNCs and enhance their interaction with the surrounding chiral environment. As a result, the composite films exhibit pronounced circularly polarized luminescence. Measurements of CPL show dissymmetry factors reaching values of approximately 0.24, which represents a suprisingly high level of circular polarization for perovskite-based emissive systems.

Analysis of the optical response indicates that the observed CPL originates from the interplay of two distinct mechanisms. The first mechanism is the intrinsic chiral organization of PNCs within the chiral liquid-crystalline template, which induces asymmetry in the emission process. The second mechanism arises from selective optical filtering by the chiral matrix itself, which preferentially transmits one circular polarization component over the other. Importantly, these two effects can coexist and reinforce each other, leading to a significant amplification of the CPL signal.

A key advantage of the presented system is the possibility of tuning the relative contribution of these mechanisms. By selecting nanocrystals emitting in different spectral regions and controlling the mode of their assembly within the liquid-crystalline matrix, it is possible to adjust the spectral overlap between the emission band and the optical activity of the host structure. This enables control over whether intrinsic chiral emission or selective filtering dominates the resulting CPL response.

Overall, this study demonstrates a versatile strategy for generating highly dissymmetric circularly polarized luminescence from achiral perovskite nanocrystals embedded in chiral liquid-crystalline templates. The resulting thin film composites combine strong polarization selectivity with spectral tunability across the visible range, offering a promising platform for the development of CPL-based photonic materials and devices.