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<p>Triply doped CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Nd<sup>3+</sup>, and Gd<sup>3+</sup> phosphors were synthesized using a solid-state method at 1300&#xa0;°C and coupled with TiO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub>. The effects of the Gd<sup>3+</sup> concentration as a codopant on the emission intensity and afterglow performance of the phosphors were investigated. The characterization of CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Nd<sup>3+</sup>, and Gd<sup>3+</sup> was performed via X-ray diffraction, scanning electron microscopy, UV–Vis absorption spectroscopy, and energy-dispersive spectroscopy. Fluorescence spectroscopy was performed to evaluate the excitation, emission, and afterglow-decay properties of the synthesized phosphor. The Gd<sup>3+</sup>-co-doped CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Nd<sup>3+</sup> phosphor exhibited enhanced luminescence properties in relation to a commercial CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Nd<sup>3+</sup> phosphor. In addition, outstanding photocatalytic efficiencies were observed for the Gd<sup>3+</sup>-co-doped CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Nd<sup>3+</sup> phosphor/TiO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> composite in relation to those for the non-Gd<sup>3+</sup> samples under UV-light illumination. Alternatively, Gd<sup>3+</sup>-doped and undoped CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Nd<sup>3+</sup>/TiO<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> exhibited similar photocatalytic efficiencies under visible-light illumination.</p>

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Enhanced photocatalytic performance for TiO2/g-C3N4 catalysts by coupling with Gd-doped CaAl2O4:Eu2+, Nd3+ phosphor

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Hyun-Sung Kang,
  • Qiushi Xu,
  • Jung-Sik Kim

摘要

Triply doped CaAl2O4:Eu2+, Nd3+, and Gd3+ phosphors were synthesized using a solid-state method at 1300 °C and coupled with TiO2/g-C3N4. The effects of the Gd3+ concentration as a codopant on the emission intensity and afterglow performance of the phosphors were investigated. The characterization of CaAl2O4:Eu2+, Nd3+, and Gd3+ was performed via X-ray diffraction, scanning electron microscopy, UV–Vis absorption spectroscopy, and energy-dispersive spectroscopy. Fluorescence spectroscopy was performed to evaluate the excitation, emission, and afterglow-decay properties of the synthesized phosphor. The Gd3+-co-doped CaAl2O4:Eu2+, Nd3+ phosphor exhibited enhanced luminescence properties in relation to a commercial CaAl2O4:Eu2+, Nd3+ phosphor. In addition, outstanding photocatalytic efficiencies were observed for the Gd3+-co-doped CaAl2O4:Eu2+, Nd3+ phosphor/TiO2/g-C3N4 composite in relation to those for the non-Gd3+ samples under UV-light illumination. Alternatively, Gd3+-doped and undoped CaAl2O4:Eu2+, Nd3+/TiO2/g-C3N4 exhibited similar photocatalytic efficiencies under visible-light illumination.