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Highly NIR-emissive lanthanide polyselenides.

Anna Kornienko1, Brian F Moore, G Ajith Kumar

  • 1Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA.

Inorganic Chemistry
|August 27, 2011
PubMed
Summary
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Researchers synthesized novel ellipsoidal polyselenide clusters, (py)(11)Ln(7)Se(21)HgSePh, with potential applications in materials science. The neodymium (Nd) compound demonstrated exceptional 43% quantum efficiency in near-infrared emission, surpassing existing molecular neodymium materials.

Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Lanthanide selenide compounds are of interest for their unique structural and photophysical properties.
  • Developing new molecular materials with high quantum efficiency is crucial for advanced optical applications.

Purpose of the Study:

  • To synthesize and characterize novel lanthanide polyselenide clusters.
  • To investigate the structural and photophysical properties of these new compounds.
  • To explore their potential as high-efficiency luminescent materials.

Main Methods:

  • Synthesis of Ln(SePh)(3) (Ln = Ce, Pr, Nd) via reduction of PhSeSePh with elemental Ln and Hg catalyst.
  • Reaction with excess elemental selenium to form the ellipsoidal polyselenide cluster (py)(11)Ln(7)Se(21)HgSePh.

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  • Structural characterization using X-ray crystallography and near-infrared (NIR) emission spectroscopy.

    • Main Results:

    • The novel ellipsoidal polyselenide cluster (py)(11)Ln(7)Se(21)HgSePh was successfully synthesized and structurally characterized.
    • The molecular structure features fused square arrays of eight- or nine-coordinate lanthanide ions.
    • The neodymium (Nd) compound exhibited a remarkable 43% quantum efficiency for the (4)F(3/2) to (4)I(11/2) transition at 1075 nm, the highest reported for a molecular Nd compound.

    Conclusions:

    • The synthesized selenide-based clusters represent a new class of molecular materials with extraordinary quantum efficiency.
    • These compounds show promise for applications in optics and photonics, comparing favorably with solid-state materials.
    • The high quantum efficiency of the Nd compound highlights the potential of these polyselenide clusters for advanced luminescent devices.