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<p>NaY<sub>9</sub>Si<sub>6</sub>O<sub>26</sub> nanoparticles with varying Pr<sup>3+</sup> concentrations were synthesized by an alkaline hydrothermal process, yielding agglomerated spherical particles ∼55&#xa0;nm in diameter with a hexagonal crystal structure. Emission spectra show that the intensity of UV 4f¹5d¹→4f² emissions is partially suppressed by efficient nonradiative relaxation, resulting in sharp visible emissions from intraconfigurational Pr<sup>3+</sup> 4f² transitions. The photoluminescence intensity increases with Pr³⁺ concentration up to 0.2&#xa0;mol%, where the strongest emission is observed, and then decreases at higher concentrations. Increasing the Pr³⁺ concentration also decreases the emission decay constant for both the 4f¹5d¹ and 4f² levels. These materials exhibit excellent thermal and temporal stability, retaining ~ 95% of their room-temperature emission up to 150&#xa0;°C and showing no degradation over 400&#xa0;min of continuous operation, underscoring their robustness. Prototype LED demonstrators fabricated with these phosphors show efficient color-tunable orange, yellow, and green emission, confirming strong compatibility with commercial LED platforms and potential for solid-state lighting.</p>

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Pr³⁺ Activated NaY₉Si₆O₂₆ Nanophosphors With Tunable Visible Emission and High Thermal Stability for Solid-state Lightning

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Jovana Periša,
  • Sanja Kuzman,
  • Zoran Ristić,
  • Vladimir Pankratov,
  • Tatjana Dramićanin,
  • Abdullah N. Alodhayb,
  • Željka Antić,
  • Miroslav D. Dramićanin

摘要

NaY9Si6O26 nanoparticles with varying Pr3+ concentrations were synthesized by an alkaline hydrothermal process, yielding agglomerated spherical particles ∼55 nm in diameter with a hexagonal crystal structure. Emission spectra show that the intensity of UV 4f¹5d¹→4f² emissions is partially suppressed by efficient nonradiative relaxation, resulting in sharp visible emissions from intraconfigurational Pr3+ 4f² transitions. The photoluminescence intensity increases with Pr³⁺ concentration up to 0.2 mol%, where the strongest emission is observed, and then decreases at higher concentrations. Increasing the Pr³⁺ concentration also decreases the emission decay constant for both the 4f¹5d¹ and 4f² levels. These materials exhibit excellent thermal and temporal stability, retaining ~ 95% of their room-temperature emission up to 150 °C and showing no degradation over 400 min of continuous operation, underscoring their robustness. Prototype LED demonstrators fabricated with these phosphors show efficient color-tunable orange, yellow, and green emission, confirming strong compatibility with commercial LED platforms and potential for solid-state lighting.