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- W3133295439 endingPage "2007992" @default.
- W3133295439 startingPage "2007992" @default.
- W3133295439 abstract "Fluorophores with high quantum yields, extended maximum emission wavelengths, and long photoluminescence (PL) lifetimes are still lacking for sensing and imaging applications in the second near-infrared window (NIR-II). In this work, a series of rod-shaped icosahedral nanoclusters with bright NIR-II PL, quantum yields up to ≈8%, and a peak emission wavelength of 1520 nm are reported. It is found that the bright NIR-II emission arises from a previously ignored state with near-zero oscillator strength in the ground-state geometry and the central Au atom in the nanoclusters suppresses the non-radiative transitions and enhances the overall PL efficiency. In addition, a framework is developed to analyze and relate the underlying transitions for the absorptions and the NIR-II emissions in the Au nanoclusters based on the experimentally defined absorption coefficient. Overall, this work not only shows good performance of the rod-shaped icosahedral series of Au nanoclusters as NIR-II fluorophores, but also unravels the fundamental electronic transitions and atomic-level structure-property relations for the enhancement of the NIR-II PL in gold nanoclusters. The framework developed here also provides a simple method to analyze the underlying electronic transitions in metal nanoclusters." @default.
- W3133295439 created "2021-03-01" @default.
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- W3133295439 date "2021-02-23" @default.
- W3133295439 modified "2023-10-11" @default.
- W3133295439 title "Bright NIR‐II Photoluminescence in Rod‐Shaped Icosahedral Gold Nanoclusters" @default.
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- W3133295439 doi "https://doi.org/10.1002/smll.202007992" @default.
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- W3133295439 hasPublicationYear "2021" @default.
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