Cited by 42Organoboron and organosilicon chemistryOrganic Electronics and PhotovoltaicsLuminescence and Fluorescent Materials

NIR‐II Absorbing Monodispersed Oligomers Based on N−B←N Unit

Xu, Jin, Zhang, Yingze, Liu, Jun, Wang, Lixiang·2023·Angewandte Chemie International Edition

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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Crossref · 10.1002/anie.202310838

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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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