Publication date: 22nd July 2026
Lead halide perovskite nanocrystals (LHP NCs) - the latest generation of colloidal quantum dots (QDs) - possess dynamic, entropically stabilized soft lattices and electronically benign surfaces that, remarkably, do not compromise their textbook semiconductor optical quality. They are intrinsically bright emitters without the need for epitaxial wide-bandgap shells. In recent years, LHP NCs have emerged as the most intensively studied QD material, challenging the field's foundational paradigms in nearly every respect. They are the first QDs to exhibit excitonic coherence on timescales comparable to their radiative lifetimes. Their giant oscillator strength effect enables extremely fast emission (lifetimes as short as 60 ps) even in relatively large NCs, while maintaining single-photon emission. The excitonic fine structure of LHP QDs can be readily engineered through shape anisotropy. Periodic ensembles of LHP NCs have further demonstrated collective, accelerated radiative decay - superfluorescence - a phenomenon previously unseen in colloidal systems. This property unlocks future prospects of devising deterministic N-photon sources, through creation of N-QDs aggregate states. Our latest work focuses on expanding the operation of perovskite QDs to the red and near-infrared ranges, available with fully Tin-based and Lead-Tin-based compositions. The key enabler is to attain and maintain sufficiently low self-doping levels (originating from Sn vacancies and oxidation), in particular, through de-doping strategies and core-shell morphologies. The presentation will encompass our latest works along these research lines.
