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NIR-II Absorbing Monodispersed Oligomers Based on N-B←N Unit.

Jin Xu1,2, Yingze Zhang1,2, Jun Liu1,2

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.

Angewandte Chemie (International Ed. in English)
|August 27, 2023
PubMed
Summary

Researchers developed new organic molecules for near-infrared II (NIR II) light absorption. These novel boron-nitrogen compounds show promise for advanced opto-electronic devices and biological applications.

Keywords:
Near InfraredOligomersOrganic PhotodetectorsResonant N−B←N UnitSmall Bandgap

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Optoelectronics

Background:

  • Organic molecules with near-infrared II (NIR II) light absorption are crucial for biological imaging and optoelectronic devices.
  • Developing novel materials with enhanced NIR II absorption properties remains an active research area.

Purpose of the Study:

  • To design and synthesize novel monodispersed oligomers with strong NIR II light absorption.
  • To explore the potential of these oligomers in optoelectronic applications, specifically organic photodetectors (OPDs).

Main Methods:

  • A new molecular design strategy utilizing a resonant N-B←N unit (balanced boron-nitrogen covalent and coordination bonds) was employed.
  • A series of monodispersed oligomers based on thiophene-fused 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (TB) were synthesized.
  • The optical properties and performance in OPDs were characterized.

Main Results:

  • The synthesized TB oligomers exhibited strong NIR II absorption.
  • The TB pentamer showed the longest absorption wavelength (1169 nm) reported for oligomers to date.
  • Organic photodetectors utilizing the TB tetramer demonstrated high specific detectivity (2.98×10^11 Jones at 1180 nm), competitive with state-of-the-art NIR II OPDs.

Conclusions:

  • The novel resonant N-B←N unit strategy is effective for creating efficient NIR II absorbing organic molecules.
  • These oligomers represent a new class of high-performance optoelectronic materials for NIR II applications.
  • The findings open avenues for further development of advanced NIR II absorbing materials.