Fluorescent temperature measurement has become a research hotspot due to its characteristics of non-contact, miniaturization, and fast response. However, it remains a key challenge to realize excellent sensitivity and high resolution. Herein, a series of LaMgTiO:Dy,Mn phosphors are developed and the related energy transfer between Dy→Mn is discovered. The coupling distance between Mn and adjacent ligands is greatly affected by temperature. However, the energy differences between the emission energy levels and lower energy levels of Dy hinder the multi-phonon relaxation process, which moderates the thermal quenching rate of Dy. Therefore, highly sensitive FIR thermometers are built according to the significant discrimination temperature dependence of Dy and Mn. The maximum and reach 0.022 K(@563 K) and 2.622 %K(@544 K). In contrast, a thermometer based on the emission lifetime of Mn is fabricated, which is extremely sensitive to temperature. Interestingly, Dy can effectively promote the quenching of Mn, and then improve the sensitivity. The maximum enhances from 1.621 %K(@503 K) to 2.305 %K (@480 K). The high sensitivity and resolution of the dual-mode fluorescence thermometry have exceeded most of the current optical thermal measurement materials. Besides, the thermochromic properties presented by the designed phosphors can be combined with PDMS films to qualitatively evaluate the ambient temperature.

中文翻译：

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用于协同发光双模温度计和高分辨率成像的 Dy3+、Mn4+ 共掺杂荧光粉

荧光测温技术以其非接触、小型化、快速响应等特点成为研究热点。然而，实现出色的灵敏度和高分辨率仍然是一个关键挑战。在此，开发了一系列 LaMgTiO:Dy,Mn 荧光粉，并发现了 Dy→Mn 之间相关的能量转移。 Mn与相邻配体之间的耦合距离受温度影响很大。然而，Dy的发射能级和较低能级之间的能量差异阻碍了多声子弛豫过程，从而减缓了Dy的热猝灭速率。因此，根据 Dy 和 Mn 显着的辨别温度依赖性构建了高灵敏度 FIR 温度计。最大可达 0.022 K(@563 K) 和 2.622 %K(@544 K)。相比之下，基于Mn发射寿命制造的温度计对温度极其敏感。有趣的是，Dy可以有效促进Mn的淬火，进而提高灵敏度。最大值从 1.621 %K(@503 K) 增强至 2.305 %K (@480 K)。双模荧光测温的高灵敏度和分辨率已经超过了目前大多数光学热测量材料。此外，所设计的荧光粉呈现的热致变色特性可以与PDMS薄膜结合来定性评估环境温度。