Double J-Coupling Strategy for Near Infrared Emitters
Abstract
Fluorophores emitting in the near-infrared (NIR) are highly desired for various applications, but increasing nonradiative rates cause severe fluorescence quenching for wavelengths beyond 800 nm. Here, a bis(squaraine) dye is reported that bears two NIR dyes in a head-to-tail chromophore arrangement. This arrangement leads to intra molecular J-type exciton coupling, resulting in an absorption maximum at 961 nm and a fluorescence peak at 971 nm with a quantum yield of 0.33% in chloroform. In less polar toluene, the bis(squaraine) self-assembles into nanofibers, affording another bathochromic shift with an absorption maximum at 1095 nm and a fluorescence peak at 1116 nm originating from inter molecular J-type coupling.
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Bis(squaraine) dye Bis-SQ composed of two collinearly connected chromophores displayed a strongly bathochromically shifted absorption maximum at 961 nm and a fluorescence peak at 971 nm due to an intramolecular J-type coupling in chloroform.
“Bis(squaraine) dye Bis-SQ composed of two collinearly connected chromophores displayed a strongly bathochromically shifted absorption maximum at 961 nm and a fluorescence peak at 971 nm due to an intramolecular J-type coupling in chloroform.117”
From The Pursuit of Shortwave Infrared-Emitting Nanoparticles with Bright Fluorescence through Molecular Design and Excited-State Engineering of Molecular Aggregates (2022) · cites this paper as [117]
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- Authors
- Shen, C.-A., Stolte, M., Kim, J. H., Rausch, A., & Würthner, F.
- Affiliations
- University of Würzburg (DE)
- Corresponding author
- Würthner, Frank
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-07-29
- Volume
- 143
- Issue
- 31
- Pages
- 11946-11950
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W3184439326
- Cited by
- 54
- References
- 36
- Citations by year
- 2026: 8 · 2025: 12 · 2024: 9 · 2023: 14 · 2022: 9 · 2021: 2
- FWCI
- 2.58
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Journal of the American Chemical Society (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Bavarian State Ministry for Science and the Arts (Solar Technologies Go Hybrid)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
- Keywords
- near-infrared emitters, fluorescence quenching, self-assembly, nanofibers, bathochromic shift, quantum yield, nonradiative decay
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