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<p>Using a traditional solid-state reaction, a series of europium-activated Li<sub>2</sub>MgSiO<sub>4</sub> (LMS:Eu<sup>3+</sup>) phosphors were synthesized with boric acid as a flux. The powder XRD profiles and Rietveld analysis of the prepared samples confirm the phase formation. The luminescent properties were examined through PL excitation and emission spectra. The observation of intense red emission spectra is primarily due to the prominent electric dipole transitions. Initially, the emission increases, but it decreases beyond 3&#xa0;mol% due to the concentration quenching effect, which in Eu<sup>3+−</sup>activated Li<sub>2</sub>MgSiO<sub>4</sub> is attributed to dipole-quadrupole interactions. The Eu<sup>3+</sup>-activated Li<sub>2</sub>MgSiO<sub>4</sub> phosphor was also used as a fluorescent powder for latent fingerprint detection and security ink. Under 254&#xa0;nm irradiation, the results showed better visualization, with high sensitivity, resolution, and selectivity. These findings suggest that Eu<sup>3+</sup>-activated Li<sub>2</sub>MgSiO<sub>4</sub> phosphor could be a potential candidate for practical applications in forensic and anticounterfeiting fields.</p>

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Structural and spectroscopic investigations of flux-assisted intense red Eu3+-activated Li2MgSiO4 orthosilicate phosphor

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • G. V. Kanmani,
  • V. Ponnusamy,
  • S.M.M.Kennedy,
  • Kavia J. Albert

摘要

Using a traditional solid-state reaction, a series of europium-activated Li2MgSiO4 (LMS:Eu3+) phosphors were synthesized with boric acid as a flux. The powder XRD profiles and Rietveld analysis of the prepared samples confirm the phase formation. The luminescent properties were examined through PL excitation and emission spectra. The observation of intense red emission spectra is primarily due to the prominent electric dipole transitions. Initially, the emission increases, but it decreases beyond 3 mol% due to the concentration quenching effect, which in Eu3+−activated Li2MgSiO4 is attributed to dipole-quadrupole interactions. The Eu3+-activated Li2MgSiO4 phosphor was also used as a fluorescent powder for latent fingerprint detection and security ink. Under 254 nm irradiation, the results showed better visualization, with high sensitivity, resolution, and selectivity. These findings suggest that Eu3+-activated Li2MgSiO4 phosphor could be a potential candidate for practical applications in forensic and anticounterfeiting fields.