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• W3046332495 abstract "Using a combination of density-gradient and analytical ultracentrifugation, we studied the photophysical profile of CsPbBr3 nanocrystal (NC) suspensions by separating them into size-resolved fractions. Ultracentrifugation drastically alters the ligand profile of the NCs, which necessitates postprocessing to restore colloidal stability and enhance quantum yield (QY). Rejuvenated fractions show a 50% increase in QY compared to no treatment and a 30% increase with respect to the parent. Our results demonstrate how the NC environment can be manipulated to improve photophysical performance, even after there has been a measurable decline in the response. Size separation reveals blue-emitting fractions, a narrowing of photoluminescence spectra in comparison to the parent, and a crossover from single- to stretched-exponential relaxation dynamics with decreasing NC size. As a function of edge length, L, our results confirm that the photoluminescence peak energy scales a L–2, in agreement with the simplest picture of quantum confinement." @default.
• W3046332495 created "2020-08-07" @default.
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• W3046332495 date "2020-07-30" @default.
• W3046332495 modified "2023-10-18" @default.
• W3046332495 title "Brightly Luminescent CsPbBr₃ Nanocrystals through Ultracentrifugation" @default.
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• W3046332495 doi "https://doi.org/10.1021/acs.jpclett.0c01936" @default.
• W3046332495 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32787334" @default.
• W3046332495 hasPublicationYear "2020" @default.
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