Publication date: 8th June 2021
Lead halide perovskite NCs have shown in the recent past that they can compete with and potentially surpass the specs met by traditional III-V and II-VI quantum dots in applications such as displays, LEDs,[1] and Quantum computing,[2] once their stability issues are addressed. Using zwitterionic ligands the NCs could be stabilized thus far as to that they can be completely isolated form reactants and by-products without altering their size, shape or composition. In applying size selective precipitation we isolated monodisperse fractions in large enough yields to enable characterization, device fabrication or self-assembly.[3] At this stage of research on lead halide perovskite NCs it is critical to study well defined i.e. stable, clean and monodisperse samples to disentangle the different influences of their shape, size and composition as well as surface chemistry on their physical characteristics. In this spirit we studied the size dependent absorption and emission lifetime at room temperature and propose a quantum confinement model, which is in excellent agreement with our data. In the past it was shown, that assemblies of perovskite NCs couple to display superfluorescence.[4] In this work we characterize such self- assembled 3D super-crystals by GI-SAXS and show that the superfluorescence characteristics are not only also present in assemblies generated from size selected samples but that they also are critically dependent on the NC’s size.
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