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<p>Eu<sup>3+</sup>-doped Ba<sub>3</sub>Lu<sub>4</sub>O<sub>9</sub> (1–10&#xa0;mol%) bright red emitters were efficiently produced through an economical solution combustion technique. Phase formation and structural analysis was executed using the obtained specific X-ray diffraction (XRD) patterns. The pure rhombohedral form of Ba<sub>3</sub>Lu<sub>3.8</sub>Eu<sub>0.2</sub>O<sub>9</sub> sample with R3(146) space group was achieved by Rietveld refinement analysis. Field emission scanning electron microscope (FE-SEM) as well as transmission electron microscopy (TEM) provides clustered nature of particles in 60–70&#xa0;nm range. The energy band-gap of host lattice (4.9&#xa0;eV) and Ba<sub>3</sub>Lu<sub>3.8</sub>Eu<sub>0.2</sub>O<sub>9</sub> composition (5.50&#xa0;eV) lie within the semiconductor range enhancing the area of their application. The existence of Ba, Lu, Eu &amp; O elements in optimum composition (5&#xa0;mol%) was proved via Electron diffraction studies (EDS). Under 396&#xa0;nm excitation, the dominant transition <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> at 621&#xa0;nm is obtained which is responsible for red luminescence of Eu<sup>3+</sup> ions. The Judd–Ofelt intensity parameters (Ω<sub>2</sub> and Ω<sub>4</sub>) were determined based on the emission intensities corresponding to the <sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub> and <sup>5</sup>D<sub>0</sub>​ → <sup>7</sup>F<sub>4</sub>​ transitions of the europium (III) ion, respectively. Critical distance for energy transmission among nearby Eu<sup>3+</sup> ions was found to be 13.71&#xa0;Å. However, the colorimetric values of 5–10&#xa0;mol% samples are very near to red coordinates (0.6667, 0.3333) of standard NTSC color system, and the values of CCT measured by the emission profiles fall in range of 1918 to 2942&#xa0;K implying the participation of Eu<sup>3+</sup> doped nanophosphor in designing warm WLEDs for indoor lighting applications.&#xa0;</p>

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Synthesis and Photoluminescence Properties of Eu3+ Doped Ba3Lu4O9 Nanomaterials of High Colour Purity for LEDs Applications

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Aarti Khatkar,
  • Dinesh Kumar,
  • Rajesh Kumar,
  • Suman Lata

摘要

Eu3+-doped Ba3Lu4O9 (1–10 mol%) bright red emitters were efficiently produced through an economical solution combustion technique. Phase formation and structural analysis was executed using the obtained specific X-ray diffraction (XRD) patterns. The pure rhombohedral form of Ba3Lu3.8Eu0.2O9 sample with R3(146) space group was achieved by Rietveld refinement analysis. Field emission scanning electron microscope (FE-SEM) as well as transmission electron microscopy (TEM) provides clustered nature of particles in 60–70 nm range. The energy band-gap of host lattice (4.9 eV) and Ba3Lu3.8Eu0.2O9 composition (5.50 eV) lie within the semiconductor range enhancing the area of their application. The existence of Ba, Lu, Eu & O elements in optimum composition (5 mol%) was proved via Electron diffraction studies (EDS). Under 396 nm excitation, the dominant transition 5D0 → 7F2 at 621 nm is obtained which is responsible for red luminescence of Eu3+ ions. The Judd–Ofelt intensity parameters (Ω2 and Ω4) were determined based on the emission intensities corresponding to the 5D0 → 7F2 and 5D0​ → 7F4​ transitions of the europium (III) ion, respectively. Critical distance for energy transmission among nearby Eu3+ ions was found to be 13.71 Å. However, the colorimetric values of 5–10 mol% samples are very near to red coordinates (0.6667, 0.3333) of standard NTSC color system, and the values of CCT measured by the emission profiles fall in range of 1918 to 2942 K implying the participation of Eu3+ doped nanophosphor in designing warm WLEDs for indoor lighting applications.