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<p>This study focuses on the structural and optical properties of a novel sequence of Dy<sup>3+</sup> incorporated CaGdAl<sub>3</sub>O<sub>7</sub>. The series was fabricated through solution-combustion route at 1200&#xa0;°C. Powder X-ray diffraction (PXRD) reveals a single phase, while Transmission Electron Microscopy (TEM) illustrates the crystallite size of the fabricated sample. Energy Dispersive X-Ray Analysis (EDAX) spectra and mapping exposed the elemental composition of CaGd<sub>0.97</sub>Dy<sub>0.03</sub>Al<sub>3</sub>O<sub>7</sub> nanophosphor. At excitation of 350&#xa0;nm, Photoluminescence (PL) emission spectra displayed two peaks allocated at 480&#xa0;nm (<sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>15/2</sub>) and 576&#xa0;nm (<sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>13/2</sub>) in the blue and yellow region, respectively. 3&#xa0;mol% doped nanophosphor was observed to be an optimum concentration. The determined value for critical distance was 21 Å<sup>3</sup> which is much greater than 5 Å<sup>3</sup> showing the existence of multipole interaction between dopant ions. Using the Kubelka and Munk relation, the value of energy bandgap of CaGd<sub>0.97</sub>Dy<sub>0.03</sub>Al<sub>3</sub>O<sub>7</sub> nanophosphor was 5.17&#xa0;eV. CIE coordinates (0.258, 0.302) and CCT value 11456&#xa0;K indicate emission of cool white light. Therefore, CaGd<sub>0.97</sub>Dy<sub>0.03</sub>Al<sub>3</sub>O<sub>7</sub> could have potential application in NUV-based WLEDs.</p>

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Synthesis and optical evaluation of Dy3+ doped CaGdAl3O7 nanophosphor for cool white light emission

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Mansi Malik,
  • Dinesh Kumar

摘要

This study focuses on the structural and optical properties of a novel sequence of Dy3+ incorporated CaGdAl3O7. The series was fabricated through solution-combustion route at 1200 °C. Powder X-ray diffraction (PXRD) reveals a single phase, while Transmission Electron Microscopy (TEM) illustrates the crystallite size of the fabricated sample. Energy Dispersive X-Ray Analysis (EDAX) spectra and mapping exposed the elemental composition of CaGd0.97Dy0.03Al3O7 nanophosphor. At excitation of 350 nm, Photoluminescence (PL) emission spectra displayed two peaks allocated at 480 nm (4F9/2 → 6H15/2) and 576 nm (4F9/2 → 6H13/2) in the blue and yellow region, respectively. 3 mol% doped nanophosphor was observed to be an optimum concentration. The determined value for critical distance was 21 Å3 which is much greater than 5 Å3 showing the existence of multipole interaction between dopant ions. Using the Kubelka and Munk relation, the value of energy bandgap of CaGd0.97Dy0.03Al3O7 nanophosphor was 5.17 eV. CIE coordinates (0.258, 0.302) and CCT value 11456 K indicate emission of cool white light. Therefore, CaGd0.97Dy0.03Al3O7 could have potential application in NUV-based WLEDs.