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<p>A series of Eu<sup>3+</sup>-doped Sr<sub>2</sub>Ta<sub>2</sub>O<sub>7</sub> red-emitting phosphors (Sr<sub>2-<i>x</i></sub>Ta<sub>2</sub>O<sub>7</sub>: <i>x</i>Eu<sup>3+</sup>, 0.02 ≤ <i>x</i> ≤ 0.12) were synthesized via a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis confirmed the formation of a pure host phase and the successful incorporation of Eu<sup>3+</sup> into the Sr<sub>2</sub>Ta<sub>2</sub>O<sub>7</sub> lattice. Under excitation at 462&#xa0;nm, which matches commercial blue LED chips, the phosphors exhibit intense red emission at 613&#xa0;nm, corresponding to the <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> transition of Eu<sup>3+</sup>. The optimal doping concentration was determined to be <i>x</i> = 0.08, yielding the highest emission intensity. The optimized Sr<sub>1.92</sub>Ta<sub>2</sub>O<sub>7</sub>: 0.08Eu<sup>3+</sup> phosphor features excellent chromaticity properties, with Commission Internationale de l’Éclairage (CIE) coordinates of (0.6028, 0.3966), a high color purity of up to 85.3%, and a low correlated color temperature (CCT) of 1613&#xa0;K. These properties, comparable to or better than many commercially available red phosphors, demonstrate that Sr<sub>2-<i>x</i></sub>Ta<sub>2</sub>O<sub>7</sub>: <i>x</i>Eu<sup>3+</sup> is a highly promising red-emitting candidate for blue chip-excited white-light-emitting diodes (w-LEDs).</p> Graphical abstract <p></p>

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Synthesis and photoluminescence characteristics of Eu3+-doped Sr2Ta2O7 red-emitting phosphors: A promising candidate for w-LEDs

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Longxuan Wang,
  • Biao Guo,
  • Xiaolong Yang,
  • Tian Liang,
  • Qifeng Tang

摘要

A series of Eu3+-doped Sr2Ta2O7 red-emitting phosphors (Sr2-xTa2O7: xEu3+, 0.02 ≤ x ≤ 0.12) were synthesized via a high-temperature solid-state reaction. X-ray diffraction (XRD) analysis confirmed the formation of a pure host phase and the successful incorporation of Eu3+ into the Sr2Ta2O7 lattice. Under excitation at 462 nm, which matches commercial blue LED chips, the phosphors exhibit intense red emission at 613 nm, corresponding to the 5D0 → 7F2 transition of Eu3+. The optimal doping concentration was determined to be x = 0.08, yielding the highest emission intensity. The optimized Sr1.92Ta2O7: 0.08Eu3+ phosphor features excellent chromaticity properties, with Commission Internationale de l’Éclairage (CIE) coordinates of (0.6028, 0.3966), a high color purity of up to 85.3%, and a low correlated color temperature (CCT) of 1613 K. These properties, comparable to or better than many commercially available red phosphors, demonstrate that Sr2-xTa2O7: xEu3+ is a highly promising red-emitting candidate for blue chip-excited white-light-emitting diodes (w-LEDs).

Graphical abstract