Publication date: 22nd July 2026
Lead halide perovskite nanocrystals have emerged as promising materials for light-emitting devices owing to their high photoluminescence quantum yield, narrow emission linewidth, and facile spectral tunability. Their optoelectronic properties, however, are governed not only by the inorganic nanocrystal core but also by the dynamic organic ligand sphere, which controls colloidal stability, self-assembly, charge injection, and interparticle coupling. Despite this central role, directly visualizing and quantitatively understanding the ligand shell remains a major challenge.
This presentation will discuss how complementary spectroscopic and scattering techniques can be combined to reveal the structure, dynamics, and function of ligand shells on lead halide perovskite nanocrystals and their assemblies. Quantitative nuclear magnetic resonance spectroscopy, neutron scattering, spectroelectrochemistry, and spatially resolved fluorescence microscopy provide direct insight into ligand density, binding dynamics, and electrochemical charge injection. These studies reveal how ligand exchange, ligand stripping, and dynamic surface equilibria modify the nanocrystal surface and govern collective properties in assembled supercrystals.
Building on this microscopic understanding, the ligand sphere can be engineered to tailor optoelectronic functionality. Tailored ligand design enables tuning of charge-injection barriers through molecular inductive effects, improves the robustness of nanocrystal supercrystals by controlled ligand-density reduction, and facilitates the integration of mechanically stable assemblies into photonic architectures. Together, these examples illustrate how visualizing the ligand sphere provides the foundation for designing surface chemistries that translate directly into improved performance of nanocrystal-based lighting and optoelectronic devices.
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