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<p>T-type La<sub>0.998</sub>Pr<sub>0.002</sub>VO₄ phosphor was synthesized via a hydrothermal method at 180&#xa0;°C for 16&#xa0;h under varying pH values. The results indicate that while pH value has no impact on the crystal structure, a nanorod morphology is achieved at pH = 8. The emission spectra, under excitation at 315&#xa0;nm, reveal a broad emission band attributed to the VO<sub>4</sub><sup>3−</sup> charge transfer (VCT) transition and a sharp emission peak corresponding to the characteristic <sup>1</sup>D<sub>2</sub> → <sup>3</sup>H<sub>4</sub> electronic transition of Pr<sup>3</sup>⁺ ions. The highest emission intensity is observed for the phosphor synthesized at pH = 8, approximately 1.5 times greater than that of the phosphor prepared at pH = 5, which is attributed to the optimized nanorod structure. Furthermore, the decay time for the phosphor synthesized at pH = 8 is 8.62&#xa0;ms, the longest among all samples, highlighting enhanced luminescent performance. These findings demonstrate that various particle morphologies of color-tunable t-type La<sub>0.998</sub>Pr<sub>0.002</sub>VO₄ phosphors can be achieved by adjusting the pH value during synthesis, making them promising candidates for advanced photonic and lighting applications.</p>

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Structure and photoluminescent properties of color-tunable T-type La0.998Pr0.002VO4 phosphor synthesized via the hydrothermal method with solution pH modification

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Lay-Gaik Teoh,
  • Sean Wu,
  • Hao-Long Chen,
  • Yee-Shin Chang

摘要

T-type La0.998Pr0.002VO₄ phosphor was synthesized via a hydrothermal method at 180 °C for 16 h under varying pH values. The results indicate that while pH value has no impact on the crystal structure, a nanorod morphology is achieved at pH = 8. The emission spectra, under excitation at 315 nm, reveal a broad emission band attributed to the VO43− charge transfer (VCT) transition and a sharp emission peak corresponding to the characteristic 1D2 → 3H4 electronic transition of Pr3⁺ ions. The highest emission intensity is observed for the phosphor synthesized at pH = 8, approximately 1.5 times greater than that of the phosphor prepared at pH = 5, which is attributed to the optimized nanorod structure. Furthermore, the decay time for the phosphor synthesized at pH = 8 is 8.62 ms, the longest among all samples, highlighting enhanced luminescent performance. These findings demonstrate that various particle morphologies of color-tunable t-type La0.998Pr0.002VO₄ phosphors can be achieved by adjusting the pH value during synthesis, making them promising candidates for advanced photonic and lighting applications.