We observe temperature-dependent phase changes in a precursor of europium-doped titania (p-Eu:TiO₂) that is prepared via precipitation and is laser-heated to temperatures between 473 K and 1246 K within sub-second heating durations. The phase changes are characterized using X-ray diffraction and site-selective photoluminescence spectroscopy. We find that upon heating, the initially amorphous p-Eu:TiO₂ first transforms into the anatase phase and then into a mixed anatase/rutile phase. These phase transformations change the local environment of the dopant Eu³⁺ ions resulting in modifications to the Eu³⁺ ions spectroscopic properties, with the modifications occurring for calcination temperatures above approximately 573 K following sub-second durations. These results demonstrate the temperature sensing ability of p-Eu:TiO₂ nanoparticles for use in sub-second heating events. Moreover, at 573 K this temperature is lower than other host materials that we have evaluated (i.e., La₂O₃, ZrO₂ and Y₂O₃).

我们观察到via掺杂的二氧化钛（p-Eu：TiO ₂）的前驱体中随温度变化的相变，该前驱体是通过沉淀制备的，并在亚秒级的加热时间内被激光加热至473  K和1246  K之间的温度。使用X射线衍射和位点选择性光致发光光谱法表征相变。我们发现加热后，最初的非晶态p-Eu：TiO ₂首先转变为锐钛矿相，然后转变为锐钛矿/金红石混合相。这些相变改变了掺杂的Eu ³⁺离子的局部环境，从而导致对Eu ^3+的修饰离子的光谱性质，在 亚秒持续时间内，煅烧温度超过约573 K时会发生变化。这些结果证明了用于亚秒加热事件的p-Eu：TiO ₂纳米颗粒的温度感测能力。此外，在573  K时，该温度低于我们评估过的其他主体材料（即La ₂ O ₃，ZrO ₂和Y ₂ O ₃）。