Wei Tang, Haiyong Ni, Qiuhong Zhang, Jianhong Ding
Guangdong Research Insitute of Rare-Metal, Guangdong Academy of Science Guangzhou 510650 China
RSC Adv. 2018 Jul 2;8(42):23996-24001. doi: 10.1039/c8ra04228d. eCollection 2018 Jun 27.
Optical temperature sensing based on the variation of the fluorescence intensity ratio of rare-earth materials has become appealing due to its multiple superiorities over electrical temperature sensing. However, confined by the largest energy separation of two thermally linked levels of rare earth ions, the highest sensitivity of such temperature sensing is essentially smaller than 2878/ , as reported previously from diverse systems. In this work, we demonstrate that ultrahigh-sensitive temperature sensing can be achieved from Pr-doped (BaSr)TiO based on the intensity ratio of the D-H emission to the P-H emission. The ratio can be increased as much as 90-fold when the temperature rises from room temperature to 513 K, nicely fitting a thermally linked-levels like equation and showing an ultrahigh sensitivity of 4275.1/ . The striking change of the ratio is attributed to the interaction between the two emission levels and the intervalence charge transfer state. This work may have provided a distinct route in the field of optical temperature sensing utilizing rare-earth-doped materials. In addition, the resultant product also possesses excellent photoluminescence and ferroelectric properties, showing promising potentials in multifunctional devices for practical applications.
基于稀土材料荧光强度比变化的光学温度传感，因其相对于电学温度传感具有多种优势而备受关注。然而，受限于稀土离子两个热耦合能级的最大能量间距，此前报道的来自不同体系的此类温度传感的最高灵敏度本质上小于2878/ 。在这项工作中，我们证明基于Pr掺杂的(BaSr)TiO中D-H发射与P-H发射的强度比可实现超高灵敏度温度传感。当温度从室温升至513 K时，该比值可增大至90倍，很好地符合类似热耦合能级的方程，并显示出4275.1/ 的超高灵敏度。该比值的显著变化归因于两个发射能级与价间电荷转移态之间的相互作用。这项工作可能为利用稀土掺杂材料的光学温度传感领域提供了一条独特途径。此外，所得产物还具有优异的光致发光和铁电性能，在实际应用的多功能器件中显示出广阔的应用前景。
