A DNA‐Stabilized Ag₁₈¹²+ Cluster with Excitation‐Intensity‐Dependent Dual Emission
(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:
https://lup.lub.lu.se/record/1a6e948e-dc6e-4e3f-9fe0-1df8f3a74b94
- author
- Rück, Vanessa ; Liisberg, Mikkel B. ; Mollerup, Christian Brinch ; He, Yanmei LU ; Chen, Junsheng LU ; Cerretani, Cecilia and Vosch, Tom
- organization
- publishing date
- 2023-08-14
- 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}}, }