Publication date: 8th July 2026
Perovskite nanocrystals (PNCs) have recently attracted significant attention due to their excellent optoelectronic properties and potential applications in photovoltaics and advanced display technologies. However, increasing stability and mastering self-assembly are persistent challenges. Here, we explore a liquid crystal like ligands for PNCs as means to combat both issues: achieve assemblies with non trivial symmetry, and achieve necessary stability . These so called promesogenic ligands are organic compunds, designed and synthesized in our laboratory, comprising aromatic and alkyl parts.
First, I show covering PNCs with these ligands substantially improves their thermal stability. Namely, after coating PNCs can survive 120°C instead of 80°C. Then, going one step further I will present that temperature-induced changes in ligand conformation modulate interparticle distances and ordering within thin films. Inspired by our previous work on metallic nanoparticle- liquid crystal systems[1][2], where external stimuli enabled control over particle ordering and optical absorption, we extend this approach to perovskite nanocrystals. In contrast to plasmonic systems, where absorption dominates, here we aim to investigate how controlled ordering may influence emission properties.
In particular, such structural reorganization may create conditions conducive to collective emission phenomena, including superfluorescence, characterized by synchronized, intense emission bursts. The ability to control nanocrystal organization may also open pathways toward their integration into liquid crystalline matrices exhibiting helical ordering, which could serve as a platform for generating circularly polarized luminescence (CPL).
CsPbBr₃ nanocrystals functionalized with novel organic ligands were synthesized accordingly to established protocols[3], and characterized using transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), UV–Vis spectroscopy, and fluorescence spectroscopy. These techniques allow us to correlate structural ordering with optical behavior and to confirm thermal stability.
This work aims to establish a foundation for designing stimuli-responsive perovskite nanocrystal assemblies, where controlled ordering serves as a tool to access and potentially tune emergent optical phenomena.
This work was supported by the FIRST TEAM FENG programme of the Foundation for Polish Science (FNP).
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