Observation of microsecond luminescence while studying two DNA-stabilized silver nanoclusters emitting in the 800–900 nm range

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Vanessa Rück
  • Cecilia Cerretani
  • Vlad A. Neacsu
  • Mikkel B. Liisberg
  • Tom Vosch

Detail(s)

Original languageEnglish
Pages (from-to)13483–13489
Journal / PublicationPhysical Chemistry Chemical Physics
Volume23
Issue number24
Online published3 Jun 2021
Publication statusPublished - 28 Jun 2021
Externally publishedYes

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Abstract

We investigated two DNA-stabilized silver nanoclusters (DNA-AgNCs) that show multiple absorption features in the visible region, and emit around 811 nm (DNA811-AgNC) and 841 nm (DNA841-AgNC). Both DNA-AgNCs have large Stokes shifts and can be efficiently excited with red light. A comparison with the commercially available Atto740 yielded fluorescence quantum yields in the same order of magnitude, but a higher photon output above 800 nm since both DNA-AgNCs are more red-shifted. The study of both DNA-AgNCs also revealed previously unobserved photophysical behavior for this class of emitters. The fluorescence quantum yield and decay time of DNA841-AgNC can be increased upon consecutive heating/cooling cycles. DNA811-AgNC has an additional absorption band around 470 nm, which is parallel in orientation to the lowest energy transition at 640 nm. Furthermore, we observed for the first time a DNA-AgNC population (as part of the DNA811-AgNC sample) with green and near-infrared emissive states with nanosecond and microsecond decay times, respectively. A similar dual emissive DNA-AgNC stabilized by a different 10-base DNA strand is also reported in the manuscript. These two examples highlight the need to investigate the presence of red-shifted microsecond emission for this class of emitters.

Research Area(s)

Citation Format(s)

Observation of microsecond luminescence while studying two DNA-stabilized silver nanoclusters emitting in the 800–900 nm range. / Rück, Vanessa; Cerretani, Cecilia; Neacsu, Vlad A.; Liisberg, Mikkel B.; Vosch, Tom.

In: Physical Chemistry Chemical Physics, Vol. 23, No. 24, 28.06.2021, p. 13483–13489.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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