Zhang Tian, Wang Zhaojin, Hou Jin, Xu Xinyi, Zhao Xin, Li Zijie, Di Siyi
Institute of Physics and Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji 721016, China.
Baoji Ultrafast Lasers and Advanced Materials Science and Technology Center, Baoji 721016, China.
Nanomaterials (Basel). 2024 Jul 31;14(15):1292. doi: 10.3390/nano14151292.
Non-contact temperature sensors utilising the fluorescence intensity ratio and the unique up-conversion (UC) luminescence of rare-earth ions have numerous benefits; however, their operational temperature range has remained limited. In this study, NaLuF:Yb/Ho samples were prepared by the hydrothermal method. The samples exhibited exceptional UC luminescence properties at low temperatures. The intensity of the green emission (with peak wavelengths of 540 and 546 nm) gradually decreased with increasing temperature, and the green emissions showed a unique change at low temperatures. In addition, we studied the dependence of the UC luminescence intensity on the excitation power and the variation in the decay lifetime with temperature. The experiments revealed excellent luminous performance and significantly enhanced sensitivity at low temperatures; the maximum absolute sensitivity S and relative sensitivity S of the 540 and 546 nm thermally coupled energy levels were 1.02% and 0.55% K, respectively. The potential temperature sensing properties of Yb/Ho-co-doped NaLuF makes it suitable for temperature sensing applications at temperatures as low as 30 K. This study offers a novel approach for the advancement of temperature sensing technology at low temperatures.
利用荧光强度比和稀土离子独特的上转换（UC）发光特性的非接触式温度传感器具有诸多优点；然而，其工作温度范围仍然有限。在本研究中，采用水热法制备了NaLuF:Yb/Ho样品。这些样品在低温下表现出优异的UC发光特性。绿色发射（峰值波长为540和546nm）的强度随温度升高而逐渐降低，并且绿色发射在低温下呈现出独特的变化。此外，我们研究了UC发光强度对激发功率的依赖性以及衰减寿命随温度的变化。实验揭示了优异的发光性能以及在低温下显著增强的灵敏度；540和546nm热耦合能级的最大绝对灵敏度S和相对灵敏度S分别为1.02%K和0.55%K。Yb/Ho共掺杂NaLuF的潜在温度传感特性使其适用于低至30K温度下的温度传感应用。本研究为低温温度传感技术的发展提供了一种新方法。
