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<p>To develop energy-efficient devices for a sustainable future, this study investigated thulium-doped lanthanum zirconate (La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>) as a phosphor for solid-state lighting. The material was synthesized via the sol–gel technique. X-ray diffraction (XRD) analysis was used to confirm the phosphor phase, with no impurity peaks observed. The phosphor is single-phase, has a pyrochlore cubic formation, and the crystallite size was found to be around 36&#xa0;nm. Fourier transform infrared (FTIR) spectroscopy was used to identify the various bonds in the host lattice. The energy bandgap of the optimized phosphor was calculated to be 4.87&#xa0;eV using the diffuse reflectance data by applying the Kubelka–Munk function. Photoluminescence (PL) emission and excitation studies were also conducted on these phosphors. A sharp blue luminescence, centered at 460&#xa0;nm under 360&#xa0;nm excitation, was observed, originating from the <sup>1</sup>D<sub>2</sub> → <sup>3</sup>F<sub>4</sub> transition. The intensity of this luminescence increased up to 0.05&#xa0;mol of Tm<sup>3+</sup> ions in the host lattice. Dipole–dipole interaction was confirmed as the interaction between the activator ions, leading to the quenching of the concentration. The Commission Internationale de l’Eclairage (CIE) coordinates of the prepared phosphors lay in the blue region, with the optimized sample exhibiting the highest color purity of around 76%. Hence, La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> is a stable material with luminescence properties, making it a suitable candidate as a blue-emitting phosphor for lighting and optoelectronic applications.</p>

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Insights into the Optical Behavior of Blue-Emitting La2Zr2O7:Tm3+ Phosphor

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • N. Singh,
  • Aman Prasad,
  • Pooja Rohilla,
  • A. S. Rao,
  • M. Seshadri,
  • Ji Bong Joo,
  • Vijay Singh

摘要

To develop energy-efficient devices for a sustainable future, this study investigated thulium-doped lanthanum zirconate (La2Zr2O7) as a phosphor for solid-state lighting. The material was synthesized via the sol–gel technique. X-ray diffraction (XRD) analysis was used to confirm the phosphor phase, with no impurity peaks observed. The phosphor is single-phase, has a pyrochlore cubic formation, and the crystallite size was found to be around 36 nm. Fourier transform infrared (FTIR) spectroscopy was used to identify the various bonds in the host lattice. The energy bandgap of the optimized phosphor was calculated to be 4.87 eV using the diffuse reflectance data by applying the Kubelka–Munk function. Photoluminescence (PL) emission and excitation studies were also conducted on these phosphors. A sharp blue luminescence, centered at 460 nm under 360 nm excitation, was observed, originating from the 1D2 → 3F4 transition. The intensity of this luminescence increased up to 0.05 mol of Tm3+ ions in the host lattice. Dipole–dipole interaction was confirmed as the interaction between the activator ions, leading to the quenching of the concentration. The Commission Internationale de l’Eclairage (CIE) coordinates of the prepared phosphors lay in the blue region, with the optimized sample exhibiting the highest color purity of around 76%. Hence, La2Zr2O7 is a stable material with luminescence properties, making it a suitable candidate as a blue-emitting phosphor for lighting and optoelectronic applications.