Publication date: 15th December 2025
Colloidal lead halide perovskite quantum dots (pQDs) have rapidly emerged as a versatile class of nanomaterials that combine the appealing optoelectronic properties of bulk perovskites with the advantages of quantum confinement [1]. At the single dot level, pQDs exhibit stable single photon emission up to room temperature [2] and a 50% photon indistinguishability at cryogenic temperatures [3]. This positions them among the very few colloidal emitters capable of combining high brightness, coherence, and quantum purity. However, to date, single pQD studies have relied almost exclusively on hot-injection synthesis [4], a process that requires stringent control of temperature and inert atmosphere, thus limiting scalability.
Here, we demonstrate that a modified ligand-assisted reprecipitation (LARP) method provides a robust and highly versatile alternative for producing single CsPbBr₃ pQDs. Using a recently introduced amine-mediated trimming strategy [5], combined with didodecyldimethylammonium bromide (DDAB) ligands for enhanced surface passivation, we obtain isolated LARP-synthesized pQDs suitable for fundamental photophysical properties studies. High-resolution micro-photoluminescence experiments at cryogenic temperatures show a stable emission with minimal spectral diffusion of the bright exciton with its characteristic fine structure and its low-energy optical phonon replicas. Power-dependent studies also reveal the trion and biexciton states contributions. Time-resolved measurements demonstrate sub-100-ps radiative lifetimes, and photon-correlation experiments under CW and pulsed excitation confirm high-purity single photon emission.
These results demonstrate that ligand-tailored LARP synthesis produces pQDs with intrinsic optical properties comparable to hot-injection counterparts, while offering great flexibility for post-synthetic ligand engineering. This versatility could be crucial for assembling pQDs into superstructures in order to investigate collective quantum phenomena.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.