Currently, due to the advantages of fast response, remote operations and good stability, non-contact optical temperature measurement technology based on fluorescence intensity ratio (FIR) has attracted intensive attention. Here, we successfully developed a novel Pr³⁺, Tb³⁺ co-doped YNbO₄ phosphor which can be used as a non-contact optical thermometer. Under excitation at 295 nm, Pr³⁺, Tb³⁺ co-doped YNbO₄ emits red light from Pr³⁺ (¹D₂ → ³H₄) and green light from Tb³⁺ (⁵D₄ → ⁷F₅), simultaneously. Based on strong dependence of the emission intensity on temperature, the FIR of red and green emissions is designed as detection signal to accurately monitor temperature. The maximum absolute and relative sensitivities reached as high as 0.0125 K⁻¹ at 508 K and 1.01% K⁻¹ at 478 K, respectively. The luminous color of this phosphor is sensitive to the temperature, which provides the possibility for visualization of temperature measurement. There was little change in the luminescence intensity of Pr³⁺, Tb³⁺ co-doped phosphors after they went through five heating-cooling cycles. It is proved that the multi-phonon relaxation from ³P₀ to ¹D₂ and intermediate charge transfer are responsible to the temperature-dependent luminescence of the phosphors. Optical thermometer based on the current phosphors show the advantages of high sensitivity, high precision and good repeatability. This indicates Pr³⁺, Tb³⁺ co-doped phosphors have potential application value in optical temperature sensing field.

目前，基于荧光强度比（FIR）的非接触式光学测温技术由于具有响应速度快、远程操作、稳定性好等优点而备受关注。在这里，我们成功开发了一种新型的Pr ³⁺、Tb ³⁺共掺杂YNbO ₄荧光粉，可用作非接触式光学温度计。在 295 nm 激发下，Pr ³⁺ , Tb ³⁺共掺杂 YNbO ₄发出来自 Pr ³⁺ ( ¹ D ₂  →  ³ H ₄ ) 的红光和来自 Tb ³⁺ ( ⁵ D ₄  → ⁷ F ₅ )，同时。基于发射强度对温度的强烈依赖性，设计红绿发射的FIR作为检测信号，以准确监测温度。最大绝对和相对灵敏度分别在 508 K 和 1.01% K ^-1时分别达到 0.0125 K ^-1和478 K。这种磷光体的发光颜色对温度很敏感，这为温度测量的可视化提供了可能性。Pr ³⁺、Tb ³⁺共掺杂荧光粉经过5次加热-冷却循环后发光强度变化不大。证明了³ P ₀的多声子弛豫到¹ D ₂和中间电荷转移负责荧光粉的温度依赖性发光。基于现有荧光粉的光学温度计具有灵敏度高、精度高、重复性好等优点。这表明Pr ³⁺、Tb ³⁺共掺杂荧光粉在光学温度传感领域具有潜在的应用价值。