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<p>Ca<sub>6</sub>BaP<sub>4</sub>O<sub>17</sub>:xEu<sup>2+</sup> (0.001 ≤ x ≤ 0.02) phosphors were synthesized using a high-temperature solid-state method. Crystallographic and spectroscopic analyses reveal that Eu<sup>2+</sup> ions selectively occupy the Ba<sup>2+</sup>, Ca<sup>2+</sup>(1), and Ca<sup>2+</sup>(2) sites. This site-dependent behavior enables emission color tuning by varying Eu<sup>2+</sup> doping, which influences site occupancy and energy transfer processes. Due to the differing thermal stabilities of Eu<sup>2+</sup> at Ba<sup>2+</sup> sites and at Ca<sup>2+</sup> sites, the emission intensity varies significantly with temperature. The optimized Ca<sub>6</sub>BaP<sub>4</sub>O<sub>17</sub>:1%Eu<sup>2+</sup> phosphor exhibits exceptional thermometric sensitivity, with a relative sensitivity of 2.05% K<sup>−1</sup> at 473&#xa0;K, making it a promising candidate for non-contact temperature-sensing applications. </p> Graphical abstract <p></p>

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Site-selective occupancy of Ca6BaP4O17:Eu2+ phosphor and its potential optical thermometry applications

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Duanduan He,
  • Heyun Xu,
  • Lei Xu,
  • Tao Wei,
  • Fei Long,
  • Chaoyong Deng,
  • Xucheng Li

摘要

Ca6BaP4O17:xEu2+ (0.001 ≤ x ≤ 0.02) phosphors were synthesized using a high-temperature solid-state method. Crystallographic and spectroscopic analyses reveal that Eu2+ ions selectively occupy the Ba2+, Ca2+(1), and Ca2+(2) sites. This site-dependent behavior enables emission color tuning by varying Eu2+ doping, which influences site occupancy and energy transfer processes. Due to the differing thermal stabilities of Eu2+ at Ba2+ sites and at Ca2+ sites, the emission intensity varies significantly with temperature. The optimized Ca6BaP4O17:1%Eu2+ phosphor exhibits exceptional thermometric sensitivity, with a relative sensitivity of 2.05% K−1 at 473 K, making it a promising candidate for non-contact temperature-sensing applications.

Graphical abstract