Optical thermometry has emerged as a promising technique for remote temperature sensing in plenty of applications, where traditional contact methods are useless. To date, many sensing strategies have been developed and realized, but most of them are based on monitoring of the single temperature dependent parameter. Here, we report simple dual-center materials (Eu3+ and Sm3+-doped CaWO4) that provide multimode optical thermometry. In addition to standard ratiometric approach based on intensity ratio between host and lanthanide emission bands, spectral position and bandwidth of CaWO4 emission band were successfully utilized as temperature sensitive parameters for the first time. It was shown that multimode sensing leads to broadening of temperature working range and enhances reliability of thermal sensing. The best thermometric characteristics were achieved for CaWO4:Sm3+ sample: Sr = 1.29 % K−1@273–673 K and δT = 0.15 K.

中文翻译：

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使用 CaWO4 发射带的多模光学测温


光学测温技术已成为一种很有前途的远程温度传感技术，在许多应用中，传统的接触方法是无用的。迄今为止，已经开发并实现了许多传感策略，但大多数都是基于对单个温度相关参数的监测。在这里，我们报告了提供多模光学测温的简单双中心材料（Eu3+ 和 Sm3+ 掺杂 CaWO4）。除了基于主体和镧系元素发射带之间的强度比的标准比率方法之外，CaWO4发射带的光谱位置和带宽首次被成功地用作温度敏感参数。结果表明，多模式传感可以扩大温度工作范围并提高热传感的可靠性。 CaWO4:Sm3+ 样品获得了最佳测温特性：Sr = 1.29 % K−1@273–673 K 且 δT = 0.15 K。