DOI: https://doi.org/10.29363/nanoge.emlem.2022.044
Publication date: 15th July 2022
Research into semiconductor lead halide perovskite (LHP) nanocrystals (NCs) has rapidly developed for solution-processed light emitters and photovoltaics since their hot-injection synthesis in 2015 [1, 2]. LHP NCs are currently synthesized with narrow size distributions, which naturally leads to investigations on their self-assembly capabilities. Ordered NC arrays, or supercrystals (SCs) [3], are the forms of solid-state LHP materials alternative to polycrystalline films and single crystals, which can behave very differently from their individual constituents when they interact coherently with each other. Superradiance have been recently observed for LHP SCs, identified by its spectral features [3]. In this study we show superradiance emission from CsPbBr3 supercrystal structures, with NCs lateral dimensions between 4 and 11 nm. We performed statistical analysis of the spectral characteristics, comparing our results with a theoretical model, and extract an estimation of the number of single emitters contributing to the superradiance emission. Following the photoluminiscence spectra and lifetime evolution as a function of temperature we identified two main channels for thermal decoherence of the superradiance. Our work represents an important step to understand how the supercrystal emission enhancement factor depends on thermal dephasing processes and size distribution. The future ability to manipulate N photon coherent light states with high photon homogeneity at room temperature (RT) represents a great goal for the development of new quantum technology applications [4, 5].
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