Publication date: 15th December 2025
Lead halide perovskite nanocrystals (LHP NCs) are of broad interest as classical light sources (LED/LCD displays) and as quantum light sources. Their surface chemistry overwhelmingly dominates the subsequent utility. The NC core, in this case, is structurally extremely soft and practically any covalent or strongly coordinating bonding to the surface competes with the internal bonding, posing a great surface capping dilemma. In particular, the solvates of the lead ions or haloplumbates may outcompete the internal bonding. The ligands known to attach but not ruin the LHP NC are mostly binding through ionic bonding. We will review the pros and cons. of thus far successfully used cationic ligands, including the latest generation of sulfonium and guanidinium long-chain molecules [1,2], as well as stronger-binding commercial and synthetic phospholipids [3]. We will review distinct four cases of these ligands based on their tightness of binding as well as the dynamicity of binding. We show that the binding dynamics is crucial for photocatalytic applications of these nanocrystals, relying on photoinduced charge-transfer to the substrate molecule [4]. We will then discuss the prospects of thus far underinvestigated anionic ligands, focusing on head-groups bearing multiple oxide ions, as well as the importance of ligand-tail engineering [5]. We aim to address an overarching question: which surface chemistry should be pursued for optimal retention of the LHP NC structural and colloidal integrity – does an ideal ligand even exist? And if not, what guideline can we offer for diverse applications, including quantum light sources? The presentation will encompass the work of my interdisciplinary team and diverse international collaborators, whose names will be appropriately mentioned in the presentation and footnotes.
1. O. Kolomiiets et al. ACS Nano, 2025, 19, 30, 27860–27872.
2. Y. Berezowska et al. J. Am Chem. Soc. 2025, in print
3. V. Morad et al. Nature, 2024, 626, 542–548
4. V. M. Amberg et al. J. Am. Chem. Soc., 2025, 147, 10, 8548–8558
5. V. Morad et al. submitted
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