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<p>Ca<sub>9</sub>Y(PO<sub>4</sub>)<sub>7</sub>: Er<sup>3+</sup>, Yb<sup>3+</sup> upconversion phosphors were synthesized by a high-temperature solid-state method. The crystal structure, upconversion emission properties, and optical thermometric performance of the samples were systematically investigated. Under 980-nm excitation, three emission bands located at 527, 553, and 651&#xa0;nm were observed, corresponding to the transitions of ²H<sub>11/2</sub>→⁴I<sub>15/2</sub>, ⁴S<sub>3/2</sub>→⁴I<sub>15/2</sub>, and ⁴F<sub>9/2</sub>→⁴I<sub>15/2</sub> of Er³⁺, respectively. The emission intensities showed strong dependence on Er³⁺ and Yb³⁺ concentrations. Based on the luminescence intensity ratio (LIR) method, the temperature-sensing properties of both thermally coupled levels (TCLs: <sup>2</sup>H<sub>11/2</sub> - <sup>4</sup>S<sub>3/2</sub>) and non-thermally coupled levels (NTCLs: <sup>2</sup>H<sub>11/2</sub> - <sup>4</sup>F<sub>9/2</sub>) were evaluated. The maximum absolute sensitivity (S<sub>a</sub>) and relative sensitivity (S<sub>r</sub>) were found to be 0.00894&#xa0;K<sup>-1</sup> at 750&#xa0;K and 1.41%·K<sup>-1</sup> at 327&#xa0;K for TCLs, and 0.0022&#xa0;K<sup>-1</sup> at 853&#xa0;K and 0.51%·K<sup>-1</sup> at 523&#xa0;K for NTCLs, respectively. These results demonstrate the promising potential of Ca<sub>9</sub>Y(PO<sub>4</sub>)<sub>7</sub>: Er<sup>3+</sup>, Yb<sup>3+</sup> phosphors for optical temperature sensing applications across a wide temperature range.</p>

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Upconversion luminescence and optical thermometry of Ca9Y(PO4)7: Er3+, Yb3+ phosphors

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yunfei Zhuang,
  • Yalan Bian,
  • Zhiping Yang

摘要

Ca9Y(PO4)7: Er3+, Yb3+ upconversion phosphors were synthesized by a high-temperature solid-state method. The crystal structure, upconversion emission properties, and optical thermometric performance of the samples were systematically investigated. Under 980-nm excitation, three emission bands located at 527, 553, and 651 nm were observed, corresponding to the transitions of ²H11/2→⁴I15/2, ⁴S3/2→⁴I15/2, and ⁴F9/2→⁴I15/2 of Er³⁺, respectively. The emission intensities showed strong dependence on Er³⁺ and Yb³⁺ concentrations. Based on the luminescence intensity ratio (LIR) method, the temperature-sensing properties of both thermally coupled levels (TCLs: 2H11/2 - 4S3/2) and non-thermally coupled levels (NTCLs: 2H11/2 - 4F9/2) were evaluated. The maximum absolute sensitivity (Sa) and relative sensitivity (Sr) were found to be 0.00894 K-1 at 750 K and 1.41%·K-1 at 327 K for TCLs, and 0.0022 K-1 at 853 K and 0.51%·K-1 at 523 K for NTCLs, respectively. These results demonstrate the promising potential of Ca9Y(PO4)7: Er3+, Yb3+ phosphors for optical temperature sensing applications across a wide temperature range.