Xing Zhifeng, Suo Hao, Chun Fengjun, Wei Xiaohe, Wang Feng
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR 999077, China.
National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China.
ACS Appl Mater Interfaces. 2024 Mar 20;16(11):13972-13979. doi: 10.1021/acsami.3c18301. Epub 2024 Mar 6.
Optical ratiometric thermometry techniques have gained much attention in recent years due to their reliable and noncontact temperature sensing capability for industrial and biorelated applications. Herein, we exploited the temperature dependence of the absorption band of BaTiO (BTO) for novel excitation intensity ratio (EIR) thermometry. Photoluminescence and excitation properties of Eu-doped BTO powders were studied as a function of Eu doping concentration. The excitation peak intensities at 397 and 468 nm, corresponding to the F → L and D transitions of Eu, were used as EIR parameters. The temperature dependence of the EIR can be explained by the competitive absorption between Eu and the BTO host. The EIR properties were studied in relation to the doping concentration, registering a maximum relative sensitivity () of 4.89% K in BTO:Eu (0.5%) at 303 K. An amphoteric Eu occupation mode at both Ba and Ti sites was found to interpret the doping concentration dependence of the . The reduced Ba site occupation ratio proved to be responsible for the low values at high Eu doping concentrations. Accordingly, an Eu/Ti codoping method was further proposed to improve the by increasing the Ba site occupation ratio. Our result showed that BTO:Eu (0.5%) demonstrated an enhancement of from 4.89 to 6.42% K at 303 K after 2% Ti codoping.
近年来，光学比率测温技术因其在工业和生物相关应用中具有可靠的非接触式温度传感能力而备受关注。在此，我们利用钛酸钡（BTO）吸收带的温度依赖性开发了新型激发强度比（EIR）测温法。研究了掺铕BTO粉末的光致发光和激发特性与铕掺杂浓度的关系。对应于铕的F→L和D跃迁的397和468nm处的激发峰强度用作EIR参数。EIR的温度依赖性可以用铕与BTO基质之间的竞争吸收来解释。研究了EIR特性与掺杂浓度的关系，在303K时，BTO:Eu（0.5%）的最大相对灵敏度（）为4.89%K。发现铕在钡和钛位点上的两性占据模式可以解释的掺杂浓度依赖性。事实证明，在高铕掺杂浓度下，钡位点占据率降低是导致值较低的原因。因此，进一步提出了铕/钛共掺杂方法，通过提高钡位点占据率来改善。我们的结果表明，在2%钛共掺杂后，BTO:Eu（0.5%）在303K时的增强从4.89%K提高到6.42%K。
