NIR‐II Absorbing Monodispersed Oligomers Based on N−B←N Unit
Abstract
Organic molecules with near‐infrared II (NIR II) light absorption are essential for many biological and opto‐electronic applications. Herein, we report monodispersed oligomers as NIR II light absorber using a new molecular design strategy of resonant N−B←N unit, i.e. balanced resonant boron‐nitrogen covalent bond (B−N) and boron‐nitrogen coordination bond (B←N). We synthesize a series of monodispersed oligomers with thiophene‐fused 4,4‐difluoro‐4‐bora‐3a,4a‐diaza‐s‐indacene (TB), which contains resonant N−B←N unit, as the repeating unit. The TB pentamer exhibits the maximum absorption wavelength of 1169 nm, which is the longest for oligomers reported so far. Organic photodetectors (OPDs) with the TB tetramer as the electron acceptor shows the specific detectivity of 2.98×10 11 Jones at 1180 nm under zero bias. This performance is among the best for NIR II OPDs. These results indicate a new kind of NIR II absorbing molecules as excellent opto‐electronic materials.
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- Authors
- Xu, J., Zhang, Y., Liu, J., & Wang, L.
- Affiliations
- University of Science and Technology of China (CN)
- Corresponding author
- Liu, Jun
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2023-09-12
- Volume
- 62
- Issue
- 42
- Pages
- e202310838-e202310838
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W4386202449
- Cited by
- 42
- References
- 63
- Citations by year
- 2026: 11 · 2025: 15 · 2024: 14 · 2023: 2
- FWCI
- 4.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Angewandte Chemie International Edition (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Key Research and Development Program of China (2019YFA0705902)
- National Natural Science Foundation of China (22135007)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Organoboron and organosilicon chemistry
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
- Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
- Keywords
- boron-nitrogen coordination, organic photodetectors, electron acceptors, detectivity, optoelectronic materials, molecular design strategy
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