Abstract

In recent years, fully inorganic cesium lead halide nanocrystals have emerged as a new, promising class of optoelectronic materials. They exhibit giant oscillator strength and long dephasing time at cryogenic temperature as well as low inhomogeneous energetic broadening, which makes them ideally suited to explore settings that exploit their exceptionally strong intrinsic light-matter coupling. Through drying-mediated self-assembly of the colloidal nanocrystals, we can realize various superlattice geometries where we observe coherent, cooperative emission, so-called superfluorescence. There the quantum dots spontaneously synchronize, thereby forming effectively a giant dipole and emitting an intense burst of light with characteristic signatures that will be discussed for different superlattice assemblies.

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