Xu Xia, Wang Zhuo, Lei Pengpeng, Yu Yingning, Yao Shuang, Song Shuyan, Liu Xiuling, Su Yue, Dong Lile, Feng Jing, Zhang Hongjie
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Science , 5625 Renmin Street, Changchun, Jilin 130022, China.
University of Chinese Academy of Sciences , Beijing 100049, China.
ACS Appl Mater Interfaces. 2015 Sep 23;7(37):20813-9. doi: 10.1021/acsami.5b05876. Epub 2015 Sep 9.
Novel flower-like α-NaYb(Mn)F4:Er(3+)/Tm(3+)@NaYF4 upconversion nanoparticles (UCNPs) as luminescent nanothermometers have been developed by combining liquid-solid solution hydrothermal strategy with thermal decomposition strategy. Under 980 nm excitation, they exhibit intense upconversion luminescence and temperature-dependent upconversion luminescence over a wide temperature range. The influence of temperature on "band-shape" upconversion luminescence (UCL) spectra and the intensity of emission bands are analyzed and discussed in detail. We further successfully test and verify that intensity ratios REr of (2)H11/2 → (4)I15/2 and (4)S3/2 → (4)I15/2 and RTm of (1)G4 → (3)H5 and (3)H4 → (3)H6 are sensitive to temperature, and the population of active ions follows Boltzmann-type population distribution very well. These luminescent nanothermometers could be applied over a wide temperature range from 123 to 423 K with high sensitivity, which enable them to be excellent candidates for temperature sensors.
通过将液固溶液水热法与热分解法相结合，制备了新型花状α-NaYb(Mn)F4:Er(3+)/Tm(3+)@NaYF4上转换纳米粒子（UCNPs）作为发光纳米温度计。在980nm激发下，它们在很宽的温度范围内表现出强烈的上转换发光和温度依赖的上转换发光。详细分析和讨论了温度对“带状”上转换发光（UCL）光谱和发射带强度的影响。我们进一步成功测试并验证了(2)H11/2→(4)I15/2和(4)S3/2→(4)I15/2的强度比REr以及(1)G4→(3)H5和(3)H4→(3)H6的强度比RTm对温度敏感，并且激活离子的布居非常符合玻尔兹曼型布居分布。这些发光纳米温度计可在123至423K的宽温度范围内以高灵敏度应用，这使其成为温度传感器的极佳候选者。
