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<p>Dy<sup>3+</sup>/Eu<sup>3+</sup> codoped LiGd(WO<sub>4</sub>)<sub>2</sub> (LGdW) phosphors were successfully synthesized using a hydrothermal method. The tetragonal phase structure of LGdW was confirmed through powder X-ray diffraction (XRD) analysis. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the phosphors exhibited irregular, quasi-ellipsoidal, and oval-like morphologies. Photoluminescence (PL) spectra showed prominent emission peaks at approximately 488&#xa0;nm (blue) and 575&#xa0;nm (yellow) for Dy<sup>3+</sup> doped LGdW, with an optimal Dy<sup>3+</sup> concentration of x = 0.06 for maximum emission intensity under 354&#xa0;nm excitation. The photoluminescence properties of Eu<sup>3+</sup> and Dy<sup>3+</sup> co-doped LGdW phosphors were also examined, revealing strong emission peaks at 488, 575, and 615&#xa0;nm, corresponding to the transitions <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>15/2</sub> – Dy<sup>3+</sup>, <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>13/2</sub> -Dy<sup>3+</sup>, <sup>and 5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> – Eu<sup>3+</sup>, respectively. The energy transfer mechanism between Dy<sup>3+</sup> and Eu<sup>3+</sup> ions was attributed to dipole–dipole interactions. These codoped LGdW phosphors are promising candidates for warm white-emitting solid-state lighting applications.</p>

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Tailoring photoluminescence in Dy3+/Eu3+ co-doped LiGd(WO4)2 phosphors for warm white LEDs lighting

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • K. Kavi Rasu,
  • S. Moorthy Babu,
  • K. Vijayarangamuthu

摘要

Dy3+/Eu3+ codoped LiGd(WO4)2 (LGdW) phosphors were successfully synthesized using a hydrothermal method. The tetragonal phase structure of LGdW was confirmed through powder X-ray diffraction (XRD) analysis. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the phosphors exhibited irregular, quasi-ellipsoidal, and oval-like morphologies. Photoluminescence (PL) spectra showed prominent emission peaks at approximately 488 nm (blue) and 575 nm (yellow) for Dy3+ doped LGdW, with an optimal Dy3+ concentration of x = 0.06 for maximum emission intensity under 354 nm excitation. The photoluminescence properties of Eu3+ and Dy3+ co-doped LGdW phosphors were also examined, revealing strong emission peaks at 488, 575, and 615 nm, corresponding to the transitions 4F9/2 → 6H15/2 – Dy3+, 4F9/2 → 6H13/2 -Dy3+, and 5D0 → 7F2 – Eu3+, respectively. The energy transfer mechanism between Dy3+ and Eu3+ ions was attributed to dipole–dipole interactions. These codoped LGdW phosphors are promising candidates for warm white-emitting solid-state lighting applications.