There is a challenge for noncontact temperature-sensing techniques and the related materials, in which a highly reliable contactless thermometer probe with low cost and high sensitivity is in demand. Here, the Lu3Al5O12:Ce3+/Mn4+ phosphor has been designed and prepared for the high-performance fluorescence temperature-sensing application in a novel one-pot, self-redox, solid-state process. Benefiting from the different electron-lattice/phonon interactions of Ce3+ and Mn4+, two distinguishable emission peaks with significantly different temperature responses originating from Ce3+ and Mn4+ are realized. Applying the fluorescence intensity ratio of Mn4+ versus Ce3+ and the decay lifetime of Mn4+ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 100-350 K. The maximum relative sensitivities (Sr) are derived as 4.37 and 3.22% K-1 respectively, as well as a large chromaticity shift visible to naked eyes (ΔE = 153 × 10-3 in 100-350 K) is observed. This is the first report of a Ce3+,Mn4+ co-doped dual-emitting phosphor, and its unique optical thermometric features demonstrate the high potential of Lu3Al5O12:Ce3+/Mn4+ as an accurate and reliable thermometer probe candidate.

中文翻译：

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Lu3Al5O12：Ce3 + / Mn4 +荧光粉中的双模光学测温设计。

对于非接触式温度感测技术和相关材料存在挑战，其中需要具有低成本和高灵敏度的高度可靠的非接触式温度计探头。在这里，Lu3Al5O12：Ce3 + / Mn4 +荧光粉已经过设计和制备，可用于新型单锅自氧化还原固态工艺中的高性能荧光温度传感应用。得益于Ce3 +和Mn4 +的不同的电子-晶格/声子相互作用，实现了两个可区分的发射峰，它们具有源自Ce3 +和Mn4 +的明显不同的温度响应。以Mn4 +与Ce3 +的荧光强度比以及Mn4 +发射的衰变寿命为温度读数，提出了一种双模光学温度传感机制，并在100-350 K的温度范围内进行了研究。最大相对灵敏度（Sr）分别为4.37和3.22％K-1，并且观察到肉眼可见的大色度偏移（在100-350 K中ΔE= 153×10-3）。这是Ce3 +，Mn4 +共掺杂双发射磷光体的首次报道，其独特的光学测温功能证明了Lu3Al5O12：Ce3 + / Mn4 +作为准确可靠的温度计探针的高潜力。