A DNA‐Stabilized Ag₁₈¹²+ Cluster with Excitation‐Intensity‐Dependent Dual Emission

Vanessa Rück, Mikkel B. Liisberg, Christian Brinch Mollerup, Yanmei He, Junsheng Chen, Cecilia Cerretani, Tom Vosch

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

DNA-stabilized silver nanoclusters (DNA-AgNCs) are easily tunable emitters with intriguing photophysical properties. Here, a DNA-AgNC with dual emission in the red and near-infrared (NIR) regions is presented. Mass spectrometry data showed that two DNA strands stabilize 18 silver atoms with a nanocluster charge of 12+. Besides determining the composition and charge of DNA2[Ag18]12+, steady-state and time-resolved methods were applied to characterize the picosecond red fluorescence and the relatively intense microsecond-lived NIR luminescence. During this process, the luminescence-to-fluorescence ratio was found to be excitation-intensity-dependent. This peculiar feature is very rare for molecular emitters and allows the use of DNA2[Ag18]12+ as a nanoscale excitation intensity probe. For this purpose, calibration curves were constructed using three different approaches based either on steady-state or time-resolved emission measurements. The results showed that processes like thermally activated delayed fluorescence (TADF) or photon upconversion through triplet-triplet annihilation (TTA) could be excluded for DNA2[Ag18]12+. We, therefore, speculate that the ratiometric excitation intensity response could be the result of optically activated delayed fluorescence.
Originalspråkengelska
Artikelnummere202309760
TidskriftAngewandte Chemie - International Edition
Volym62
Nummer39
Tidigt onlinedatum2023 aug. 14
DOI
StatusPublished - 2023

Ämnesklassifikation (UKÄ)

  • Fysikalisk kemi
  • Atom- och molekylfysik och optik

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