Publication date: 8th July 2026
The growing demand for quantum technologies in communication and computing necessitates the development of novel quantum light sources, driving a constant search for model systems satisfying the stringent requirements for a coherent single-photon source. Colloidal lead halide perovskite nanocrystals (LHP NCs) in the weak confinement regime have recently emerged as compelling candidates, demonstrating high single-photon purity, sub-100 ps radiative lifetimes, and photon indistinguishability of 56% – among the highest reported for any colloidal single-photon emitter. [1,2] To date, however, only CsPbBr₃ NCs in the 20-25 nm size range have been investigated, whereas NCs beyond this size regime remain largely unexplored, leaving open a fundamental question: can single-photon purity be retained in larger NCs while simultaneously pushing radiative lifetimes to their ultimate limits?
In this study, we demonstrate the synthesis of CsPbBr3 NCs with dimensions exceeding 30 nm through the rational design of growth-mediating ligands that preserve NC colloidal stability during synthesis. By systematically leveraging the structure of ligand tail, we extend this approach to all cuboidal shapes – cubes, plates, rods – with exquisite control over all three morphological parameters. Post-synthetic ligand exchange with state-of-the-art phosphoethanolamine-based zwitterionic ligands enhances NC emissivity and imparts robust colloidal, environmental, and dilution stability – important prerequisites for optical characterization of individual NCs. Systematic single-particle spectroscopy reveals how NC dimensions govern key metrics of single-photon emission – radiative lifetime, photon antibunching, and polarized emission – thereby identifying the size regime of CsPbBr₃ NCs optimal for quantum emitter applications.
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