Hao Haoyue, Zhu MengYao, Li Liang
School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zi Bo 255000, China.
ACS Omega. 2023 Feb 7;8(7):6847-6853. doi: 10.1021/acsomega.2c07565. eCollection 2023 Feb 21.
In this paper, Er/Yb codoped YLuO solid solution was prepared through the sol-gel method, and the substitution of Y by Lu ions in YO was confirmed by X-ray diffraction data. The up-conversion emissions of samples under 980 nm excitation and the relative up-conversion processes are investigated. The emission shapes do not vary with the change in doping concentration due to the unaltered cubic phase. The red-to-green ratio changes from 2.7 to 7.8 and then declines to 4.4 as the doping concentration of Lu increases from 0 to 100. The emission lifetimes of green and red have similar variation: the emission lifetime decreases with doping concentration changing from 0 to 60 and rises as the doping concentration continues to increase. The reason why the emission ratio and lifetime change could be originated to the exacerbation of cross-relaxing process and the change of radiative transition probabilities. The temperature-dependent fluorescence intensity ratio (FIR) shows that all samples can be used in noncontact optical temperature sensing, and the method of local structure distortion can be used to improve sensitivity further. The max sensing sensitivities of FIR based on and reach 0.011 K (483 K) and 0.21 K (300 K). The results display that Er/Yb codoped YLuO solid solution can be potential candidates for optical temperature sensing in different temperature ranges.
本文采用溶胶-凝胶法制备了Er/Yb共掺杂的YLuO固溶体，并通过X射线衍射数据证实了Lu离子在YO中对Y的取代。研究了样品在980 nm激发下的上转换发射及相关上转换过程。由于立方相未改变，发射形状不随掺杂浓度的变化而变化。随着Lu掺杂浓度从0增加到100，红/绿比从2.7变为7.8，然后降至4.4。绿色和红色的发射寿命有相似的变化：发射寿命随着掺杂浓度从0变化到60而降低，随着掺杂浓度继续增加而升高。发射比和寿命变化的原因可能源于交叉弛豫过程的加剧和辐射跃迁概率的变化。温度依赖的荧光强度比（FIR）表明，所有样品都可用于非接触式光学温度传感，并且局部结构畸变方法可进一步提高灵敏度。基于 和 的FIR的最大传感灵敏度分别达到0.011 K（483 K）和0.21 K（300 K）。结果表明，Er/Yb共掺杂的YLuO固溶体在不同温度范围内可能是光学温度传感的潜在候选材料。
