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<p>The development of thermally stable and colour tunable phosphors is critical for advanced solid-state lighting and optical temperature-sensing applications. In this work, a series of Ca<sub>2</sub>MgWO<sub>6</sub> phosphors doped with 3&#xa0;mol% Dy<sup>3+</sup> and varying concentrations of Eu<sup>3+</sup> (x = 0, 2, 5, 8, 11, 14&#xa0;mol%) were synthesized via a solid-state reaction method. The study demonstrates efficient energy transfer from Dy<sup>3+</sup> to Eu<sup>3+</sup> ions, enabling colour tunability, with an optimal Eu<sup>3+</sup> concentration of 5&#xa0;mol% before concentration quenching occurs. The optimized phosphor exhibits a direct band gap of 3.34&#xa0;eV and excellent thermal stability, retaining significant luminescence up to 498&#xa0;K, with a thermal quenching temperature of 389.71&#xa0;K and activation energy of 0.27&#xa0;eV. Temperature-dependent photoluminescence analysis using higher-order polynomial fits revealed maximum absolute and relative sensitivities of 0.0778&#xa0;K<sup>− 1</sup> at 423&#xa0;K and 0.96% K<sup>− 1</sup> at 498&#xa0;K, respectively. These findings signify that the prepared Ca<sub>2</sub>MgWO<sub>6</sub>:Dy<sup>3+</sup>, Eu<sup>3+</sup> phosphors demonstrates great potential for applications in optical thermometry and lighting technologies.</p>

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Colour Tunable Ca2MgWO6:Dy3+, Eu3+ Phosphors for FIR-Based Temperature Sensing: Energy Transfer Dynamics and Higher-Order Polynomial Modelling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月15日

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  • R. Kiran,
  • S. Masilla Moses Kennedy,
  • A. Princy,
  • Sudha D. Kamath

摘要

The development of thermally stable and colour tunable phosphors is critical for advanced solid-state lighting and optical temperature-sensing applications. In this work, a series of Ca2MgWO6 phosphors doped with 3 mol% Dy3+ and varying concentrations of Eu3+ (x = 0, 2, 5, 8, 11, 14 mol%) were synthesized via a solid-state reaction method. The study demonstrates efficient energy transfer from Dy3+ to Eu3+ ions, enabling colour tunability, with an optimal Eu3+ concentration of 5 mol% before concentration quenching occurs. The optimized phosphor exhibits a direct band gap of 3.34 eV and excellent thermal stability, retaining significant luminescence up to 498 K, with a thermal quenching temperature of 389.71 K and activation energy of 0.27 eV. Temperature-dependent photoluminescence analysis using higher-order polynomial fits revealed maximum absolute and relative sensitivities of 0.0778 K− 1 at 423 K and 0.96% K− 1 at 498 K, respectively. These findings signify that the prepared Ca2MgWO6:Dy3+, Eu3+ phosphors demonstrates great potential for applications in optical thermometry and lighting technologies.