Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

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

Rück, Vanessa ; Liisberg, Mikkel B. ; Mollerup, Christian Brinch ; He, Yanmei LU ; Chen, Junsheng LU ; Cerretani, Cecilia and Vosch, Tom (2023) In Angewandte Chemie - International Edition 62(39).
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Angewandte Chemie - International Edition
volume
62
issue
39
article number
e202309760
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85168623787
  • pmid:37578902
ISSN
1433-7851
DOI
10.1002/anie.202309760
language
English
LU publication?
yes
id
1a6e948e-dc6e-4e3f-9fe0-1df8f3a74b94
date added to LUP
2023-09-13 17:17:15
date last changed
2023-12-22 15:46:54
@article{1a6e948e-dc6e-4e3f-9fe0-1df8f3a74b94,
  abstract     = {{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.}},
  author       = {{Rück, Vanessa and Liisberg, Mikkel B. and Mollerup, Christian Brinch and He, Yanmei and Chen, Junsheng and Cerretani, Cecilia and Vosch, Tom}},
  issn         = {{1433-7851}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{39}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Angewandte Chemie - International Edition}},
  title        = {{A DNA‐Stabilized Ag₁₈¹²+ Cluster with Excitation‐Intensity‐Dependent Dual Emission}},
  url          = {{http://dx.doi.org/10.1002/anie.202309760}},
  doi          = {{10.1002/anie.202309760}},
  volume       = {{62}},
  year         = {{2023}},
}