![]() 3D SLs self-assemble from a colloidal solution of cubic QDs as the solvent evaporates, leading to SLs ranging widely in macroscopic size, shape, and aspect ratio. These results highlight the promise and challenge in achieving long-range coherence in perovskite QD solids.Ī thorough understanding of structural heterogeneity in CsPbBr 3 quantum dot superlattices is necessary for the realization of robust exciton coherence in these systems. At low temperatures, static disorder and defects limit exciton coherence, and a wide range of coherence numbers are observed across a self-assembled sample of SLs. We observe loss of coherence and exciton localization to a single QD at higher temperatures, resulting from scattering by optical phonons. Our results demonstrate that excitons can coherently delocalize in highly ordered CsPbBr 3 superlattices leading to superradiant emission. The properties of perovskite QDS described above should also enable them to overcome hurdles experienced by other materials that limit solid-state superradiance, such as fast dephasing processes from inherent disorder and thermal fluctuations. Here, we present an investigation of exciton coherence in perovskite QD solids using temperature-dependent photoluminescence linewidth and lifetime measurements. In this work, we explore the self-assembly, disorder, and superradiant properties of 3D superlattices of CsPbBr 3 to understand how structural heterogeneity influences optical properties.Ī thorough understanding of the competition between coherence and dephasing from phonon scattering and energetic disorder is currently lacking in the literature. Ordered superlattices (SLs) grown from these QDs exhibit emergent properties resulting from their assembly. Colloidal cesium lead bromide (CsPbBr 3) quantum dots (QDs) have emerged as an exciting class of quantum emitters due to their near-unity quantum yields, large oscillator strengths, and long coherence time.
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