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<p>Lanthanide luminescent materials have found a wide range of use in various fields. While most applications utilize intrashell f–f transitions, f–d transitions have recently emerged as a novel approach to develop molecular luminescent materials. Unlike Laporte-forbidden f–f transitions, f–d transitions are Laporte-allowed and thus not dependent on chromophoric ligands. Moreover, the involvement of 5d orbitals renders it possible to modulate the emission wavelength by tuning the lanthanide–ligand interaction. Herein, we report a series of three-coordinated cerium(III) complexes with a trigonal planar geometry supported by bulky 2,6-disubstituted phenoxide ligands. These complexes were fully characterized by X-ray crystallography and <sup>1</sup>H NMR spectroscopy. In addition, we investigated the photophysical properties of these compounds that reveal strong d–f emissions with the photoluminescent quantum yield up to 62% and the CIE value of (0.46, 0.51). This work opens a new avenue to regulate the emission wavelength of lanthanide luminescent molecules through ligand field engineering.</p><p></p>

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Three-coordinated Ce(III) complexes with long wavelength d–f emissions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月22日

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  • Ziyu Liu,
  • Yihu Yang,
  • Wenliang Huang

摘要

Lanthanide luminescent materials have found a wide range of use in various fields. While most applications utilize intrashell f–f transitions, f–d transitions have recently emerged as a novel approach to develop molecular luminescent materials. Unlike Laporte-forbidden f–f transitions, f–d transitions are Laporte-allowed and thus not dependent on chromophoric ligands. Moreover, the involvement of 5d orbitals renders it possible to modulate the emission wavelength by tuning the lanthanide–ligand interaction. Herein, we report a series of three-coordinated cerium(III) complexes with a trigonal planar geometry supported by bulky 2,6-disubstituted phenoxide ligands. These complexes were fully characterized by X-ray crystallography and 1H NMR spectroscopy. In addition, we investigated the photophysical properties of these compounds that reveal strong d–f emissions with the photoluminescent quantum yield up to 62% and the CIE value of (0.46, 0.51). This work opens a new avenue to regulate the emission wavelength of lanthanide luminescent molecules through ligand field engineering.