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<p>This research involved the synthesis of a series of single-phase oxyapatite-type phosphors, Ba<sub>2</sub>La<sub>3</sub>(SiO<sub>4</sub>)<sub>2</sub>(PO<sub>4</sub>)O:Dy<sup>3+</sup> through a high-temperature solid-state reaction methodology. A comprehensive examination was undertaken to elucidate their crystallographic structure, phase homogeneity, morphological features, photoluminescence (PL) properties, and thermal stability. Phase purity was meticulously assessed via X-ray diffraction (XRD) analysis, confirming the hexagonal crystal system alignment with space group <i>P</i>6<sub>3</sub>/<i>m</i> (No.176) for the Ba<sub>2</sub>La<sub>3</sub>(SiO<sub>4</sub>)<sub>2</sub>(PO<sub>4</sub>)O:Dy<sup>3+</sup> phosphors. Excitation at 349&#xa0;nm revealed a triplet of distinguished emission peaks situated at wavelengths of 480&#xa0;nm (attributed to the <sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>15/2</sub> transition), 572&#xa0;nm (corresponding to <sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>13/2</sub>), and 664&#xa0;nm (stemming from <sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>11/2</sub> transitions). The investigation pinpointed a 0.05&#xa0;mol concentration of Dy<sup>3+</sup> as the optimum doping level within the Ba<sub>2</sub>La<sub>3</sub>(SiO<sub>4</sub>)<sub>2</sub>(PO<sub>4</sub>)O matrix for maximized luminescence. Of note, these phosphors exhibit an abnormal thermal quenching behavior alongside a substantial activation energy barrier <i>E</i><sub>a</sub> = 0.37&#xa0;eV, underscoring their robustness at elevated temperatures. The exhaustive findings from this study for advocating the application of these phosphors in light-emitting devices.</p>

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Synthesis and optical characterization of Ba2La3(SiO4)2(PO4)O:Dy3+ yellow phosphors with abnormal thermal quenching

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • Lingling Zheng,
  • Juanjuan Wen,
  • Jiayi Wu,
  • Huajuan Deng

摘要

This research involved the synthesis of a series of single-phase oxyapatite-type phosphors, Ba2La3(SiO4)2(PO4)O:Dy3+ through a high-temperature solid-state reaction methodology. A comprehensive examination was undertaken to elucidate their crystallographic structure, phase homogeneity, morphological features, photoluminescence (PL) properties, and thermal stability. Phase purity was meticulously assessed via X-ray diffraction (XRD) analysis, confirming the hexagonal crystal system alignment with space group P63/m (No.176) for the Ba2La3(SiO4)2(PO4)O:Dy3+ phosphors. Excitation at 349 nm revealed a triplet of distinguished emission peaks situated at wavelengths of 480 nm (attributed to the 4F9/2-6H15/2 transition), 572 nm (corresponding to 4F9/2-6H13/2), and 664 nm (stemming from 4F9/2-6H11/2 transitions). The investigation pinpointed a 0.05 mol concentration of Dy3+ as the optimum doping level within the Ba2La3(SiO4)2(PO4)O matrix for maximized luminescence. Of note, these phosphors exhibit an abnormal thermal quenching behavior alongside a substantial activation energy barrier Ea = 0.37 eV, underscoring their robustness at elevated temperatures. The exhaustive findings from this study for advocating the application of these phosphors in light-emitting devices.