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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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  11. Multisite Fe3+ Luminescent Centers In The Ligao2:fe Nanocrystalline Phosphor

Multisite Fe3+ Luminescent Centers in the LiGaO2:Fe Nanocrystalline Phosphor

Ajeesh Kumar Somakumar1, Ivo Romet2, Agnieszka Grabias3

  • 1Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland.

Molecules (Basel, Switzerland)
|June 13, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Trivalent iron ions in lithium gallate nanocrystals were studied using spectroscopy. The research found iron preferentially occupies tetrahedral sites, indicating potential for near-infrared luminescence applications.

Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Lithium gallate is a host material with potential applications in luminescence.
  • Incorporation of trivalent iron (Fe3+) ions can modify optical properties.
  • Understanding ion site occupancy is crucial for phosphor development.

Purpose of the Study:

  • To extensively investigate the behavior and optical properties of Fe3+ ions in orthorhombic lithium gallate nanocrystals.
  • To determine the preferred crystallographic sites occupied by Fe3+ ions.
  • To evaluate the potential of Fe3+-doped lithium gallate as a phosphor for luminescence and thermoluminescence applications.

Main Methods:

  • Synthesized orthorhombic lithium gallate nanocrystals doped with Fe3+ ions.
Keywords:
gallatesiron dopingluminescencemultisites

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  • Employed a suite of spectroscopic techniques: Raman spectroscopy, extended X-ray absorption fine structure (EXAFS), Mössbauer effect, electron paramagnetic resonance (EPR), photoluminescence (PL), thermoluminescence (TL), and cathodoluminescence (CL).
  • Conducted extensive optical studies to analyze luminescence properties.

    • Main Results:

    • Confirmed the presence of multiple crystallographic sites for Fe3+ ions within the lithium gallate matrix.
    • Demonstrated preferential occupation of tetrahedral sites by Fe3+ ions.
    • Optical studies revealed significant luminescence and thermoluminescence characteristics in the near-infrared region.

    Conclusions:

    • Fe3+ ions in orthorhombic lithium gallate exhibit site-specific occupancy, favoring tetrahedral positions.
    • The synthesized Fe3+-doped lithium gallate phosphor shows promising performance for near-infrared luminescence and thermoluminescence applications.
    • This material warrants further investigation for advanced optical device development.