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<p>In this study, a series of Ba<sub>2</sub>La<sub>1− <i>x</i></sub>SbO<sub>6</sub>:<i>x</i>Eu<sup>3+</sup> (<i>x</i> = 0, 5, 10, 15, 20, 25&#xa0;mol%) phosphors and graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) powders were synthesized via a high-temperature solid-phase method. Their structural and luminescent properties are characterized by X-ray diffraction, scanning electron microscopy, and photoluminescence spectra. Upon excitation at 273&#xa0;nm, Ba<sub>2</sub>LaSO<sub>6</sub>:Eu<sup>3+</sup> exhibits pronounced red emission, demonstrating anti-thermal quenching behavior within the temperature range of 313–453&#xa0;K. At 453&#xa0;K, its emission intensity reaches 131.3% of its initial intensity measured at 313&#xa0;K. In contrast, g-C<sub>3</sub>N<sub>4</sub> shows rapid thermal quenching, with emission intensity dropping to 12.0% at 573&#xa0;K compared to that at 313&#xa0;K. A mixed material, composed of Ba<sub>2</sub>LaSO<sub>6</sub>:10&#xa0;mol%Eu<sup>3+</sup> and g-C<sub>3</sub>N<sub>4</sub>, demonstrates dual-mode thermometric performance. Using fluorescence intensity ratio (FIR), the maximum absolute sensitivity (<i>S</i><sub>a</sub>) and relative sensitivity (<i>S</i><sub>r</sub>) are determined to be 1.34% K<sup>−1</sup> (522&#xa0;K) and 1.53% K<sup>−1</sup> (368&#xa0;K), respectively. Temperature characterization using color coordinate (CIE) shifts achieves maximum <i>S</i><sub>a</sub> and <i>S</i><sub>r</sub> values of 0.16% K<sup>−1</sup> (313&#xa0;K) and 0.63% K<sup>−1</sup> (313&#xa0;K), respectively. Additionally, the mixed material exhibits excellent repeatability, achieving a repeatability parameter (<i>R</i>) of 98.8% for FIR and 98.9% for CIE measurements across five temperature cycles. These results underscore the potential of the mixed material for self-calibrating optical thermometers.</p>

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Luminescence and Thermometric Properties of Ba2LaSbO6:Eu3+/g-C3N4 Mixed Materials

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Zitong Zhang,
  • Shuixian Yao,
  • Jun Cheng,
  • Fangfang Hu,
  • Rongfei Wei,
  • Hai Guo

摘要

In this study, a series of Ba2La1− xSbO6:xEu3+ (x = 0, 5, 10, 15, 20, 25 mol%) phosphors and graphitic carbon nitride (g-C3N4) powders were synthesized via a high-temperature solid-phase method. Their structural and luminescent properties are characterized by X-ray diffraction, scanning electron microscopy, and photoluminescence spectra. Upon excitation at 273 nm, Ba2LaSO6:Eu3+ exhibits pronounced red emission, demonstrating anti-thermal quenching behavior within the temperature range of 313–453 K. At 453 K, its emission intensity reaches 131.3% of its initial intensity measured at 313 K. In contrast, g-C3N4 shows rapid thermal quenching, with emission intensity dropping to 12.0% at 573 K compared to that at 313 K. A mixed material, composed of Ba2LaSO6:10 mol%Eu3+ and g-C3N4, demonstrates dual-mode thermometric performance. Using fluorescence intensity ratio (FIR), the maximum absolute sensitivity (Sa) and relative sensitivity (Sr) are determined to be 1.34% K−1 (522 K) and 1.53% K−1 (368 K), respectively. Temperature characterization using color coordinate (CIE) shifts achieves maximum Sa and Sr values of 0.16% K−1 (313 K) and 0.63% K−1 (313 K), respectively. Additionally, the mixed material exhibits excellent repeatability, achieving a repeatability parameter (R) of 98.8% for FIR and 98.9% for CIE measurements across five temperature cycles. These results underscore the potential of the mixed material for self-calibrating optical thermometers.