Publication date: 15th December 2025
Colloidal perovskite quantum dots (pQDs) are highly promising quantum light emitters. To date, investigations at the single-pQD scale have predominantly relied on the hot-injection synthesis method, which is performed under an inert atmosphere and at high temperature. In contrast, the ligand-assisted reprecipitation (LARP) method is carried out under ambient atmosphere and at room temperature, making it a more accessible alternative. However, LARP is typically employed for the synthesis of pQDs intended for ensemble studies rather than for single-nanocrystal investigations [1]. In this work, we report the optimization of the LARP method to synthesize pQDs suitable for individual spectral studies. Monodispersity was improved by introducing amines (PPA) during the synthesis [2], while ligand-tailoring was implemented through the incorporation of DDAB to better protect the pQDs. The nanocrystals obtained using this improved protocol exhibit high crystalline quality, as confirmed by high-resolution transmission electron microscopy (HRTEM) measurements, as well as high monodispersity evidenced by both TEM imaging and spectral measurements. Furthermore, they demonstrate single-photon emission with a second-order autocorrelation value of g(2)(0)=0.01, reaching the standards typically achieved with hot-injection-synthesized pQDs. In addition, the ease with which DDAB can be incorporated as a surface ligand is encouraging for future ligand-engineering studies. Also, functionalization of the terminal group of the amine molecules enables the fabrication of superstructures in solution, with varying shapes [3]. Overall, this optimized LARP method constitutes a versatile approach that enables a broad range of optical investigations on pQDs.
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