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<p>Chiral europium(III) (Eu(III)) complexes, owing to their characteristic f-f transitions and allowed magnetic dipole transitions, enable narrowband emission and good circularly polarized luminescence (CPL) properties with high luminescence dissymmetry factors (<i>g</i><sub>lum</sub>), exhibiting application potential in circularly polarized organic light-emitting diode (CP-OLED) and 3D display. Herein, we report a pair of <i>R</i>/<i>S</i>-Eu(TTA)<sub>3</sub>DFPO enantiomers using β-diketone 1,1,1-trifluoro-3-(2-thenoyl)acetone (TTA) as the main ligand and point-chiral <i>R</i>/<i>S</i>-<i>tert</i>-butyl(6-(diphenylphosphoryl)dibenzo-[<i>b</i>,<i>d</i>]furan-4-yl)(phenyl) phosphine-oxide (<i>R</i>/<i>S</i>-DFPO) as ancillary ligands. In toluene, the enantiomers exhibit characteristic narrowband red emission arising from <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub> transition of Eu(III), featuring a maximum emission wavelength of 617 nm with a full width at half maximum of 11 nm, together with a photoluminescence quantum yield of 43% and a pronounced chiroptical response, as evidenced by |<i>g</i><sub>PL</sub>| values of 8.0 × 10<sup>−3</sup> around 590 nm (<sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>1</sub> transition). Notably, CP-OLEDs fabricated with <i>R</i>/<i>S</i>-Eu(TTA)<sub>3</sub>DFPO via vacuum deposition exhibit a maximum external quantum efficiency of 4.0%, obvious circularly polarized electroluminescence with |<i>g</i><sub>EL</sub>| values of above 1.0 × 10<sup>−2</sup>. These results demonstrate that the application of a point-chiral phosphine-oxide ligand provides an effective strategy for achieving coordination-stable chiral Eu(III) complexes for CP-OLEDs.</p>

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Circularly polarized photoluminescence and electroluminescence of a pair of Eu(III) enantiomers based on chiral phosphine-oxide ligands

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Si-Wei Wei,
  • Zhong-Zhong Huo,
  • Yi Wei,
  • Yi-Fan Yang,
  • Jia-Zhen Zhu,
  • Jia-Qi Xi,
  • Li Yuan,
  • Chuanlang Zhan,
  • You-Xuan Zheng

摘要

Chiral europium(III) (Eu(III)) complexes, owing to their characteristic f-f transitions and allowed magnetic dipole transitions, enable narrowband emission and good circularly polarized luminescence (CPL) properties with high luminescence dissymmetry factors (glum), exhibiting application potential in circularly polarized organic light-emitting diode (CP-OLED) and 3D display. Herein, we report a pair of R/S-Eu(TTA)3DFPO enantiomers using β-diketone 1,1,1-trifluoro-3-(2-thenoyl)acetone (TTA) as the main ligand and point-chiral R/S-tert-butyl(6-(diphenylphosphoryl)dibenzo-[b,d]furan-4-yl)(phenyl) phosphine-oxide (R/S-DFPO) as ancillary ligands. In toluene, the enantiomers exhibit characteristic narrowband red emission arising from 5D0→7F2 transition of Eu(III), featuring a maximum emission wavelength of 617 nm with a full width at half maximum of 11 nm, together with a photoluminescence quantum yield of 43% and a pronounced chiroptical response, as evidenced by |gPL| values of 8.0 × 10−3 around 590 nm (5D0→7F1 transition). Notably, CP-OLEDs fabricated with R/S-Eu(TTA)3DFPO via vacuum deposition exhibit a maximum external quantum efficiency of 4.0%, obvious circularly polarized electroluminescence with |gEL| values of above 1.0 × 10−2. These results demonstrate that the application of a point-chiral phosphine-oxide ligand provides an effective strategy for achieving coordination-stable chiral Eu(III) complexes for CP-OLEDs.