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<p>New thermosensitive luminescent materials based on Ba<sub>3</sub>La<sub>2</sub>(Ge<sub>3</sub>O<sub>9</sub>)<sub>2</sub> doped with Tb<sup>3+</sup> or Tb<sup>3+</sup>/Eu<sup>3+</sup> have been studied. Ba<sub>3</sub>La<sub>2–<i>x</i></sub>Tb<sub><i>x</i></sub>(Ge<sub>3</sub>O<sub>9</sub>)<sub>2</sub> and Ba<sub>3</sub>La<sub>1.3</sub>Tb<sub>0.7–<i>x</i></sub>Eu<sub><i>x</i></sub>(Ge<sub>3</sub>O9)<sub>2</sub> solid solutions were synthesized by the solid-phase method. All samples crystallized in the monoclinic system (space group <i>C</i>2/<i>c</i>, <i>Z</i> = 4) according to the results of x-ray diffraction analysis. The luminescent properties of Ba<sub>3</sub>La<sub>2−<i>x</i></sub>Tb<sub><i>x</i></sub>(Ge<sub>3</sub>O<sub>9</sub>)<sub>2</sub> germanates were studied with excitation by radiation with λ<sub>ex</sub> = 377 nm. The spectra consisted of several bands in the range 470–640 nm due to transitions from excited <sup>5</sup><i>D</i><sub>4</sub> to <sup>7</sup><i>F</i><sub><i>J</i></sub> (<i>J</i> = 3, 4, 5, 6) levels in Tb<sup>3+</sup> ions. The maximum luminescence intensity was observed for the sample with <i>x</i> = 0.7. Co-doping of phases with Eu<sup>3+</sup> ions led to the appearance of additional lines in the luminescence spectra in the orange-red region that were associated with the transitions <sup>5</sup><i>D</i><sub>0</sub> → <sup>7</sup><i>F</i><sub><i>J</i></sub> (<i>J</i> = 0, 1, 2, 3, 4) in europium ions. The color characteristics of a Ba<sub>3</sub>La<sub>1.3</sub>Tb<sub>0.1</sub>Eu<sub>0.6</sub>(Ge<sub>3</sub>O<sub>9</sub>)<sub>2</sub> sample were studied. The temperature dependences of the intensity ratio of the luminescent bands were investigated upon heating from 298 to 473 K. It was shown that heating the phosphor led to an uneven decrease in the intensity of the main emission lines. The maximum values of sensitivities of <i>S</i><sub>a</sub> (1.05%/K) and <i>S</i><sub>r</sub> (1.00%/K) were achieved at <i>T</i> = 298 K.</p>

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Crystal Structure, Luminescent Properties, and Prospects for Using Ba3La2–xTbx(Ge3O9)2 and Ba3La1.3Tb0.7–xEux(Ge3O9)2 in Optical Thermometry

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • A. V. Bigbaeva,
  • O. A. Lipina,
  • L. L. Surat,
  • A. Yu. Chufarov,
  • A. P. Tyutyunnik,
  • Ya. V. Baklanova,
  • V. G. Zubkov

摘要

New thermosensitive luminescent materials based on Ba3La2(Ge3O9)2 doped with Tb3+ or Tb3+/Eu3+ have been studied. Ba3La2–xTbx(Ge3O9)2 and Ba3La1.3Tb0.7–xEux(Ge3O9)2 solid solutions were synthesized by the solid-phase method. All samples crystallized in the monoclinic system (space group C2/c, Z = 4) according to the results of x-ray diffraction analysis. The luminescent properties of Ba3La2−xTbx(Ge3O9)2 germanates were studied with excitation by radiation with λex = 377 nm. The spectra consisted of several bands in the range 470–640 nm due to transitions from excited 5D4 to 7FJ (J = 3, 4, 5, 6) levels in Tb3+ ions. The maximum luminescence intensity was observed for the sample with x = 0.7. Co-doping of phases with Eu3+ ions led to the appearance of additional lines in the luminescence spectra in the orange-red region that were associated with the transitions 5D0 → 7FJ (J = 0, 1, 2, 3, 4) in europium ions. The color characteristics of a Ba3La1.3Tb0.1Eu0.6(Ge3O9)2 sample were studied. The temperature dependences of the intensity ratio of the luminescent bands were investigated upon heating from 298 to 473 K. It was shown that heating the phosphor led to an uneven decrease in the intensity of the main emission lines. The maximum values of sensitivities of Sa (1.05%/K) and Sr (1.00%/K) were achieved at T = 298 K.