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<p>Li<sub>2</sub>ZnGe<sub>3</sub>O<sub>8</sub>:Er<sup>3+</sup> and Li<sub>2</sub>ZnGe<sub>3</sub>O<sub>8</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> phosphors were successfully synthesized via a high-temperature solid-state reaction method, and the upconversion luminescence properties and mechanisms of both Er<sup>3+</sup>-doped and Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped systems under 980 and 1550&#xa0;nm excitation were systematically investigated. Additionally, the optical temperature sensing performance of the Li<sub>2</sub>ZnGe<sub>3</sub>O<sub>8</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> phosphor was explored in detail. To enhance temperature sensitivity and self-calibration features, a dual-mode temperature sensing method was designed and implemented based on fluorescence intensity ratio from thermally coupled energy levels (TCELs) and non-thermally coupled energy levels (NTCELs). Experimental results show that in the TCELs mode, the maximum absolute sensitivity under 980 nm excitation is 0.003197&#xa0;K<sup>–1</sup> (462&#xa0;K), and under 1550&#xa0;nm excitation is 0.0028&#xa0;K<sup>–1</sup> (303&#xa0;K); while in the NTCELs mode, the maximum absolute sensitivity under 980&#xa0;nm excitation is 0.003059&#xa0;K<sup>–1</sup> (529&#xa0;K), and under 1550&#xa0;nm excitation is 0.0013&#xa0;K<sup>–1</sup> (303&#xa0;K). These findings indicate that Li<sub>2</sub>ZnGe<sub>3</sub>O<sub>8</sub>:Er<sup>3+</sup>/Yb<sup>3+</sup> phosphors exhibit excellent dual-mode optical temperature sensing potential under dual-excitation conditions.</p>

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Dual-mode optical thermometry of Li2ZnGe3O8:Er3+/Yb3+ upconversion phosphors via fluorescence intensity ratio

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Shengyi Liu,
  • Shang Gao,
  • Duan Gao,
  • Xin Chen,
  • Li Wang,
  • Wenbin Song,
  • Ying Zhu,
  • Han Yin,
  • Jun Tan

摘要

Li2ZnGe3O8:Er3+ and Li2ZnGe3O8:Er3+/Yb3+ phosphors were successfully synthesized via a high-temperature solid-state reaction method, and the upconversion luminescence properties and mechanisms of both Er3+-doped and Er3+/Yb3+ co-doped systems under 980 and 1550 nm excitation were systematically investigated. Additionally, the optical temperature sensing performance of the Li2ZnGe3O8:Er3+/Yb3+ phosphor was explored in detail. To enhance temperature sensitivity and self-calibration features, a dual-mode temperature sensing method was designed and implemented based on fluorescence intensity ratio from thermally coupled energy levels (TCELs) and non-thermally coupled energy levels (NTCELs). Experimental results show that in the TCELs mode, the maximum absolute sensitivity under 980 nm excitation is 0.003197 K–1 (462 K), and under 1550 nm excitation is 0.0028 K–1 (303 K); while in the NTCELs mode, the maximum absolute sensitivity under 980 nm excitation is 0.003059 K–1 (529 K), and under 1550 nm excitation is 0.0013 K–1 (303 K). These findings indicate that Li2ZnGe3O8:Er3+/Yb3+ phosphors exhibit excellent dual-mode optical temperature sensing potential under dual-excitation conditions.