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<p>A novel Eu<sup>3+</sup>-doped double perovskite CaGdMgNbO<sub>6</sub> red phosphor was successfully synthesized via high-temperature solid-state reaction. Structural characterization confirmed the formation of a monoclinic <i>P</i><sub><i>21</i></sub><i>n</i> phase with homogeneous element distribution, as evidenced by XRD, SEM–EDS, and XPS analyses. The phosphor exhibited intense red emission at 616&#xa0;nm under 465&#xa0;nm excitation, attributed to the <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> electric dipole transition of Eu<sup>3+</sup> ions. The optimal doping concentration was determined to be 7.5&#xa0;mol%, and the internal quantum efficiency of the sample with the optimal doping concentration is 22.9%. Thermal stability measurements revealed 57.2% luminescence retention at 423&#xa0;K, supported by an activation energy of 0.223&#xa0;eV. This work provides a new candidate for red phosphors with broad excitation and thermal robustness.</p>

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Photoluminescence properties of a novel blue-light-excited double perovskite CaGdMgNbO6:Eu3+ red phosphor

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Bingjie Han,
  • Hongyu Liu,
  • Yujie Wei,
  • Yuping He,
  • Lei Shi,
  • Ying Lv

摘要

A novel Eu3+-doped double perovskite CaGdMgNbO6 red phosphor was successfully synthesized via high-temperature solid-state reaction. Structural characterization confirmed the formation of a monoclinic P21n phase with homogeneous element distribution, as evidenced by XRD, SEM–EDS, and XPS analyses. The phosphor exhibited intense red emission at 616 nm under 465 nm excitation, attributed to the 5D0 → 7F2 electric dipole transition of Eu3+ ions. The optimal doping concentration was determined to be 7.5 mol%, and the internal quantum efficiency of the sample with the optimal doping concentration is 22.9%. Thermal stability measurements revealed 57.2% luminescence retention at 423 K, supported by an activation energy of 0.223 eV. This work provides a new candidate for red phosphors with broad excitation and thermal robustness.