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Updated: Jul 26, 2025

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Binuclear Copper(I) Complexes for Near-Infrared Light-Emitting Electrochemical Cells.

Abdelaziz Jouaiti1, Lavinia Ballerini2, Hsiang-Ling Shen3

  • 1Laboratoire de Synthèse et Fonctions des Architectures Moléculaires, UMR7140 Chimie de la Matiere Complexe, Université de Strasbourg & CNRS, 4 rue Blaise, Pascal, 67000, Strasbourg, France.

Angewandte Chemie (International Ed. in English)
|June 22, 2023
PubMed
Summary

Two new copper(I) complexes, Cu-NIR1 and Cu-NIR2, achieve near-infrared (NIR) luminescence through a dinuclearization strategy. These complexes enable efficient NIR light-emitting electrochemical cells (LECs) and white-light emission.

Keywords:
Binuclear ComplexesCopper ComplexesLight-Emitting Electrochemical CellsNear-Infrared EmittersPhosphorescence

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Photophysics

Background:

  • Developing efficient near-infrared (NIR) emitters is crucial for advanced optoelectronic applications.
  • Earth-abundant metal complexes offer sustainable alternatives to precious metal-based emitters.
  • Controlling molecular structure is key to tuning photophysical properties and device performance.

Purpose of the Study:

  • To synthesize and characterize novel binuclear copper(I) complexes for NIR emission.
  • To investigate the structure-property relationships governing their luminescence.
  • To demonstrate their application in NIR light-emitting electrochemical cells (LECs).

Main Methods:

  • Synthesis of binuclear heteroleptic Cu(I) complexes (Cu-NIR1, Cu-NIR2).
  • Spectroscopic (absorption, emission) and electrochemical characterization.
  • Photophysical studies including time-resolved measurements.
  • Computational modeling (DFT) to understand electronic structure.
  • X-ray crystallography to elucidate solid-state structure.
  • Fabrication and testing of NIR light-emitting electrochemical cells (LECs).

Main Results:

  • Binuclear Cu(I) complexes exhibit significant bathochromic shift and NIR emission (up to 750 nm) due to dinuclearization.
  • Excited state assigned to triplet metal-to-ligand charge transfer (³MLCT).
  • X-ray analysis reveals π-π stacking interactions stabilizing the structure and enhancing NIR luminescence.
  • Cu-NIR1 and Cu-NIR2 demonstrate efficient electroluminescence in LECs (up to 756 nm, 0.43% EQE).
  • Successful fabrication of white-emitting LECs demonstrated.

Conclusions:

  • Dinuclearization strategy effectively shifts luminescence to the NIR region for Cu(I) complexes.
  • Interligand π-π stacking plays a vital role in maintaining luminescence efficiency.
  • These earth-abundant Cu(I) complexes represent a breakthrough for NIR-emitting LECs.
  • The developed materials are suitable for both NIR and white-light emission applications.