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Near-Infrared Luminescence from Small Gold Nanocrystals

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Schools of Physics and Chemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0430
Department of Chemistry, The University of Toronto, Toronto, Ontario, Canada, M5S 1A1
Cite this: J. Phys. Chem. B 2000, 104, 30, 6983–6986
Publication Date (Web):July 6, 2000
https://doi.org/10.1021/jp993867w
Copyright © 2000 American Chemical Society

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    Abstract

    A novel photoluminescence is reported for small metal nanocrystals in the near-infrared region (1.1−1.6 μm). Near-infrared photoluminescence spectra were measured at room temperature for 1.1 and 1.7 nm Au nanocrystals using a 1.06 μm excitation source. This photoluminescence is attributed to sp to sp-like transitions, analogous to intraband transitions in bulk gold; however, the exact mechanism is unknown. A conservative estimate for the quantum yield for the 1.7 nm gold nanocrystals is (4.4 ± 1.5) × 10-5 at room temperature, more than 5 orders of magnitude greater than that of bulk gold.

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     To whom correspondence should be addressed. E-mail:  whetten@ chemistry.gatech.edu.

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