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<p>In this study, a highly sensitive fluorescence temperature sensing strategy accompanied by color change, based on thermal population and non-radiative transition, has been developed. To enhance the temperature sensitivity in high-temperature regions and to observe significant color changes with the naked eye, the fluorescence spectrum based on thermal population and non-radiative transition has been discussed and designed. The co-doped YVO<sub>4</sub>:Tm<sup>3+</sup>/Er<sup>3+</sup> luminescent material was prepared by the high-temperature solid-phase method. Utilizing the strong absorption of ultraviolet (UV) by the V-O charge transfer band, the material was excited with 310&#xa0;nm UV light. A significant color change from blue to blue-green and finally to green was achieved in the luminescent material within the temperature range of 450&#xa0;K. The two fluorescence intensity ratios (<i>FIR</i>) were analyzed. In the high-temperature region, the <i>FIR</i> from the non-thermal coupling levels <sup>1</sup>G<sub>4</sub> and <sup>2</sup>H<sub>11/2</sub> satisfy the Boltzmann distribution. The relative sensitivity (<i>S</i><sub>r</sub>) reached its maximum at 593&#xa0;K, with a maximum value of 1.74% K<sup>− 1</sup>. Temperature uncertainty was analyzed, and CIE chromaticity coordinates were obtained for various temperatures. This strategy increased the sensitivity by 8.5 times at 593&#xa0;K compared to the thermal coupling level temperature measurement strategy. A color transition recognizable by the naked eye was achieved within the 450&#xa0;K range, demonstrating thermal anti-behavior, providing a reference for enhancing relative sensitivity in high-temperature regions.</p>

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High-sensitivity Temperature Sensing via Color Change: A Study on the Thermal Coupling and Non-thermal Coupling Energy Levels in YVO4:Tm3+/Er3+

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Zhensheng Lu,
  • Hongxia Tang,
  • Meilin Song,
  • Changxing Yu,
  • Changwen Wang

摘要

In this study, a highly sensitive fluorescence temperature sensing strategy accompanied by color change, based on thermal population and non-radiative transition, has been developed. To enhance the temperature sensitivity in high-temperature regions and to observe significant color changes with the naked eye, the fluorescence spectrum based on thermal population and non-radiative transition has been discussed and designed. The co-doped YVO4:Tm3+/Er3+ luminescent material was prepared by the high-temperature solid-phase method. Utilizing the strong absorption of ultraviolet (UV) by the V-O charge transfer band, the material was excited with 310 nm UV light. A significant color change from blue to blue-green and finally to green was achieved in the luminescent material within the temperature range of 450 K. The two fluorescence intensity ratios (FIR) were analyzed. In the high-temperature region, the FIR from the non-thermal coupling levels 1G4 and 2H11/2 satisfy the Boltzmann distribution. The relative sensitivity (Sr) reached its maximum at 593 K, with a maximum value of 1.74% K− 1. Temperature uncertainty was analyzed, and CIE chromaticity coordinates were obtained for various temperatures. This strategy increased the sensitivity by 8.5 times at 593 K compared to the thermal coupling level temperature measurement strategy. A color transition recognizable by the naked eye was achieved within the 450 K range, demonstrating thermal anti-behavior, providing a reference for enhancing relative sensitivity in high-temperature regions.