Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.671
Publication date: 16th December 2024
This year marks a decade since the advent of colloidally synthesized lead halide perovskite quantum dots (LHP QDs), a class of quantum dots defined by their uniform size and shape, tunable quantum confinement, and single-photon emission capabilities. Over this period, nearly the entire compositional range within the general formula APbX₃ has been explored, where A represents cesium (Cs), methylammonium (MA), formamidinium (FA), and azeridinium (AZ). High-quality nanocrystals have been achieved for all these compositions. Despite this progress, the exploration of LHP QDs can still be considered in its infancy.
Unlike conventional, more covalent semiconductors, LHP QDs are ionic compounds characterized by lower formation energies, entropic stabilization, and dynamic structural properties. The development of effective surface capping ligands has proven crucial for stabilizing these materials at the nanoscale and refining their photophysical behavior. Today, LHP nanocrystals are being prototyped as primary green emitters for television displays, owing to their scalable synthesis, high emissivity-per-mass under blue excitation, and narrow emission linewidths. Remarkably, their excitonic properties have surpassed initial expectations, presenting promising opportunities as quantum light sources.
At cryogenic temperatures, LHP QDs demonstrate extended excitonic coherence times, approaching the fast sub-100 ps radiative rates. Surprisingly, these properties are optimized in larger CsPbX₃ QDs (20–40 nm in size), where the quantum confinement effect diminishes. This behavior is attributed to the phenomenon of single-photon superradiance, marked by a giant oscillator strength in the single-exciton regime per nanocrystal. Furthermore, both single-component and multicomponent QD superlattices exhibit collective emission phenomena, known as superfluorescence, characterized by oscillatory, ultrafast (10–30 ps) radiative decays.
his presentation will highlight the most significant advancements achieved during this first decade of research, including our recent contributions, and will discuss the exciting future prospects for LHP QDs in various applications.
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