Abstract Tb3+,Dy3+-co-doped Ca9TbxDy1–x(PO4)5(SiO4)F2 phosphors were prepared via high-temperature solid-phase reaction method and the potential application in optical temperature measurements due to their color-tunable property was investigated in detail. The photoluminescence emission (PL) and photoluminescence excitation (PLE) spectra results show that the as-prepared phosphors exhibit both Tb3+ and Dy3+ emissions at 546 nm (5D4–7F5 transition of Tb3+) and 587 nm (4F9/2–6H13/2 transition of Dy3+) upon 376 nm excitation, respectively. In addition, the fluorescence decay analysis shows that the lifetime of the Tb3+ emission rapidly decreases, which confirms the energy transfer existence between Dy3+ and Tb3+. Under 376 nm excitation, the temperature dependence of the fluorescence intensity ratios for the dual-mission bands peaked at 546 and 587 nm was studied in the temperature range from 303 to 573 K. The results show that with the increase of Dy3+ concentration, the relative sensitivity first increases and then decreases, what's more, the maximum relative sensitivity is 3.142 × 10−3%/K for Ca9TbxDy1–x(PO4)5(SiO4)F2(x = 0.4). As a consequence, this preliminary study provides a novel method for exploring the novel thermometers.

中文翻译：

---

镝浓度对荧光粉Ca9Tb(PO4)5(SiO4)F2发光温度计灵敏度的影响

摘要 通过高温固相反应法制备了 Tb3+,Dy3+-共掺杂 Ca9TbxDy1–x(PO4)5(SiO4)F2 荧光粉，并详细研究了其颜色可调性在光学温度测量中的潜在应用。 . 光致发光发射 (PL) 和光致发光激发 (PLE) 光谱结果表明，所制备的荧光粉在 546 nm（Tb3+ 的 5D4-7F5 跃迁）和 587 nm（4F9/2-6H13/2 跃迁）处同时显示出 Tb3+ 和 Dy3+ Dy3+) 分别在 376 nm 激发下。此外，荧光衰减分析表明，Tb3+发射的寿命迅速降低，证实了Dy3+和Tb3+之间存在能量转移。在 376 nm 激发下，在303~573 K的温度范围内研究了峰值为546和587 nm的双任务波段的荧光强度比的温度依赖性。结果表明，随着Dy3+浓度的增加，相对灵敏度先增加，然后Ca9TbxDy1–x(PO4)5(SiO4)F2(x = 0.4) 的最大相对灵敏度为 3.142 × 10−3%/K。因此，这项初步研究为探索新型温度计提供了一种新方法。