Publication date: 15th December 2025
Understanding the relationship between the structural and optical properties of lead halide perovskite quantum dots (QDs) is crucial for their use in optoelectronics. Achieving this requires precise control during synthesis. However, the fast growth of highly ionic perovskite QDs and their dynamic surface passivation present significant challenges in managing their size, shape, and impurity doping during production. Although considerable progress has been made in controlling the size of perovskite QDs, especially CsPbBr3, regulation of surface morphology and impurity doping remains difficult. Here, we first explain the growth mechanism of CsPbBr3 QDs under thermodynamic equilibrium control, allowing gram-scale synthesis of strongly size-confined, monodisperse QDs.[1] Next, we describe how the surface facets of CsPbBr3 QDs can be adjusted by annealing them with facet-selective dicationic ligands designed to match the geometric arrangement of Cs+ vacancies. Finally, we present a doping mechanism based on electrostatic surface Mn2+ adsorption, which enables efficient dopant incorporation into strongly confined CsPbBr3 QDs with a Cs-deficient stoichiometry compared to undoped ones.[2] Our synthesis achieves a Mn2+ doping/alloying concentration of up to ~44%, with Mn2+ photoluminescence efficiency exceeding 90%. This allows for the determination of the intrinsic exciton-to-dopant energy transfer rate. Additionally, we will explore single-particle spectroscopy of precisely controlled perovskite QDs for single-photon sources.
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