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<p>Lanthanide complexes are efficient luminescent systems where the triplet state of the organic ligands determines the energy transfer to the emitting levels of lanthanide ions, for instance, Eu<sup>3+</sup> and Tb<sup>3+</sup> ions. According to Reinhoudt and Latva, an optimal triplet state energy gap (∆E) of 2000–5000&#xa0;cm<sup>−1</sup> favors efficient sensitization. In this work, isostructural [Eu(PHT)<sub>3</sub>·H<sub>2</sub>O] and [Tb(PHT)<sub>3</sub>·H<sub>2</sub>O] complexes were synthesized using phthalic acid (H₂PHT) as ligand, and their luminescent properties were investigated. The [Eu(PHT)<sub>3</sub>·H<sub>2</sub>O] showed a lifetime of 0.49&#xa0;ms and Φ = 26.2%, whereas the [Tb(PHT)<sub>3</sub>·H<sub>2</sub>O] exhibited a longer lifetime of 0.97&#xa0;ms and higher Φ = 85.3%. These results confirm the decisive role of the triplet state correlating the ∆E values of ~ 7520&#xa0;cm<sup>−1</sup> for Eu<sup>3+</sup> (<sup>5</sup>D<sub>0</sub>) and ~ 4270&#xa0;cm<sup>−1</sup> for Tb<sup>3+</sup> (<sup>5</sup>D<sub>4</sub>) with the performance of both complexes, providing insights for designing efficient luminescent lanthanide complexes.</p> Graphical abstract <p></p>

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Comparative luminescent performance of Eu3+ and Tb3+ phthalate complexes: Effect of the triplet–5D0/5D4 energy gap

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • R. E. Guzmán-Silva,
  • Ch. J. Salas-Juárez,
  • K. Scanda,
  • J. C. Guzmán Olguín,
  • A. J. Salazar-Medina,
  • Y. Soberanes,
  • J. Guzman-Mendoza

摘要

Lanthanide complexes are efficient luminescent systems where the triplet state of the organic ligands determines the energy transfer to the emitting levels of lanthanide ions, for instance, Eu3+ and Tb3+ ions. According to Reinhoudt and Latva, an optimal triplet state energy gap (∆E) of 2000–5000 cm−1 favors efficient sensitization. In this work, isostructural [Eu(PHT)3·H2O] and [Tb(PHT)3·H2O] complexes were synthesized using phthalic acid (H₂PHT) as ligand, and their luminescent properties were investigated. The [Eu(PHT)3·H2O] showed a lifetime of 0.49 ms and Φ = 26.2%, whereas the [Tb(PHT)3·H2O] exhibited a longer lifetime of 0.97 ms and higher Φ = 85.3%. These results confirm the decisive role of the triplet state correlating the ∆E values of ~ 7520 cm−1 for Eu3+ (5D0) and ~ 4270 cm−1 for Tb3+ (5D4) with the performance of both complexes, providing insights for designing efficient luminescent lanthanide complexes.

Graphical abstract