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<p>Ultraviolet-B (UV-B)-emitting inorganic phosphors are of considerable interest for biomedical applications, particularly in phototherapy and in the management of photosensitive dermatological disorders. Gd<sup>3+</sup>-doped Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> (YAG:Gd<sup>3+</sup>) phosphor was prepared via a low-temperature self-propagating combustion process and subsequently annealed at 1000°C for 2&#xa0;h. X-ray diffraction confirmed a single-phase cubic garnet structure, and annealing improved crystallinity without inducing a phase transformation or forming secondary phases. Photoluminescence measurements revealed sharp excitation bands at 274&#xa0;nm and a dominant UV-B emission at 314&#xa0;nm due to the <sup>6</sup>P<sub>7/2</sub> → <sup>8</sup>S<sub>7/2</sub> transition. The annealed samples exhibited enhanced emission intensity, ascribed to reduced structural defects and improved microstructural order. The room-temperature electron paramagnetic resonance spectrum of Gd<sup>3+</sup>-doped YAG phosphor exhibits multiple resonance lines in both the low-field region and near <i>g</i> ≈ 2.0. These signals are attributed to Gd<sup>3+</sup> ions occupying sites with locally distorted environments, where the ions experience comparatively strong crystal-field interactions.</p>

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Effects of Annealing on the Luminescence and EPR Properties of Gd-Doped Y3Al5O12 Phosphors Prepared Using a Solution Combustion Method

  • 期刊论文

  • 发表日期：

    2026年6月21日

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  • In-Won Kim,
  • Amol Nande,
  • Sayli Guru,
  • S. Watanabe,
  • T. K. Gundu Rao,
  • Jung-Kul Lee,
  • Vijay Singh

摘要

Ultraviolet-B (UV-B)-emitting inorganic phosphors are of considerable interest for biomedical applications, particularly in phototherapy and in the management of photosensitive dermatological disorders. Gd3+-doped Y3Al5O12 (YAG:Gd3+) phosphor was prepared via a low-temperature self-propagating combustion process and subsequently annealed at 1000°C for 2 h. X-ray diffraction confirmed a single-phase cubic garnet structure, and annealing improved crystallinity without inducing a phase transformation or forming secondary phases. Photoluminescence measurements revealed sharp excitation bands at 274 nm and a dominant UV-B emission at 314 nm due to the 6P7/2 → 8S7/2 transition. The annealed samples exhibited enhanced emission intensity, ascribed to reduced structural defects and improved microstructural order. The room-temperature electron paramagnetic resonance spectrum of Gd3+-doped YAG phosphor exhibits multiple resonance lines in both the low-field region and near g ≈ 2.0. These signals are attributed to Gd3+ ions occupying sites with locally distorted environments, where the ions experience comparatively strong crystal-field interactions.