Publication date: 17th July 2025
Colloidal nanocrystals of lead halide perovskites (LHP NCs) have a long history. They were initially conceived in Pb-doped CsBr crystals and films 30 years ago. About a decade ago, they were produced as colloids in apolar solvents. Importantly, the fast structural dynamics, essentially entropically stabilized lattice, do not seem to be detrimental to exhibiting the textbook optical quality of a semiconductor. To date, they have become the most widely researched quantum dot material. They have challenged the ethos of this field in nearly every aspect. For instance, they are bright emitters without ever being coated with an epitaxial shell. They are the first colloidal quantum dot (QD) material that exhibited excitonic coherence on a timescale comparable to their radiative rates. They are the first colloidal QD material demonstrating collective and hence accelerated radiative decay of tens of picoseconds – superfluorescence - in the periodic ensembles (known as NC superlattices). LHP NCs exhibit a giant oscillator strength effect, allowing extremely fast emission rates (lifetimes down to 60ps) at large NC sizes, and at a single particle level in the single-photon emission regime – single-photon superradiance. The exciton fine structure of LHP NCs is readily engineerable through the shape anisotropy. We also find that, by simple proximity to highly chiral plasmonic nanostructures, the otherwise linearly polarized emission becomes fully chiral; the transcribed chirality is also manifested in their absorption (dichroism), making them the first fully chiral single-photon emitters. We will review the diverse opportunities that LHP NCs increasingly offer as classical and quantum light sources. The presentation will encompass the work of my interdisciplinary team and diverse international collaborators, whose names will be appropriately mentioned in the presentation and footnotes.
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