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<p>This study reports the successful synthesis of Sr₄Nb₂O₉:xHo³⁺ (x = 0.005–0.04) green phosphors by molten salt method. Unlike conventional solid-state synthesis (1350&#xa0;°C for 7&#xa0;h), this method reduces the reaction temperature to 1100&#xa0;°C and decreases processing time to 5&#xa0;h, yielding products with regular platelet morphology. Comprehensive structural, morphological, and optical characterizations were performed through X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The Sr₄Nb₂O₉:0.02Ho³⁺ phosphor exhibits a strong green emission peak at 530&#xa0;nm under 460&#xa0;nm excitation. The optimal doping concentration was determined to be 0.02&#xa0;mol, with concentration quenching attributed to primarily mediated by dipole-dipole (d-d) interactions. The chromaticity coordinates (0.295, 0.696) indicate high color purity (99.5%) and a correlated color temperature (CCT) of 6033&#xa0;K. High-pressure Raman experiments show that Sr₄Nb₂O₉ remains structurally stable up to 15.3 GPa. High-pressure fluorescence experiments reveal that the Sr₄Nb₂O₉:0.02Ho³⁺ phosphor maintains 58% of its ambient-pressure fluorescence intensity even at 18.2 GPa. Furthermore, at 448&#xa0;K, the phosphor retains 86.8% of its room-temperature fluorescence intensity. The quantum yield of the Sr₄Nb₂O₉:0.02Ho³⁺ phosphor reached 23.6%. These findings suggest Sr₄Nb₂O₉:Ho³⁺ phosphors may be potential candidates for solid-state lighting applications in high-pressure environments.</p> Graphical Abstract <p></p>

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Photoluminescence properties of Ho3 + doped Sr4Nb2O9 phosphors synthesized by molten salt method

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Tingting Yan,
  • Lei Sun,
  • Dongyang Xi,
  • Dinghan Jin,
  • Han Li,
  • Linan Liu

摘要

This study reports the successful synthesis of Sr₄Nb₂O₉:xHo³⁺ (x = 0.005–0.04) green phosphors by molten salt method. Unlike conventional solid-state synthesis (1350 °C for 7 h), this method reduces the reaction temperature to 1100 °C and decreases processing time to 5 h, yielding products with regular platelet morphology. Comprehensive structural, morphological, and optical characterizations were performed through X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The Sr₄Nb₂O₉:0.02Ho³⁺ phosphor exhibits a strong green emission peak at 530 nm under 460 nm excitation. The optimal doping concentration was determined to be 0.02 mol, with concentration quenching attributed to primarily mediated by dipole-dipole (d-d) interactions. The chromaticity coordinates (0.295, 0.696) indicate high color purity (99.5%) and a correlated color temperature (CCT) of 6033 K. High-pressure Raman experiments show that Sr₄Nb₂O₉ remains structurally stable up to 15.3 GPa. High-pressure fluorescence experiments reveal that the Sr₄Nb₂O₉:0.02Ho³⁺ phosphor maintains 58% of its ambient-pressure fluorescence intensity even at 18.2 GPa. Furthermore, at 448 K, the phosphor retains 86.8% of its room-temperature fluorescence intensity. The quantum yield of the Sr₄Nb₂O₉:0.02Ho³⁺ phosphor reached 23.6%. These findings suggest Sr₄Nb₂O₉:Ho³⁺ phosphors may be potential candidates for solid-state lighting applications in high-pressure environments.

Graphical Abstract