Kolesnikov Ilya E, Mamonova Daria V, Kurochkin Mikhail A, Medvedev Vassily A, Bai Gongxun, Ivanova Tatiana Yu, Borisov Evgenii V, Kolesnikov Evgenii Yu
St. Petersburg State University, Universitetskaya nab. 7-9, 199034, St. Petersburg, Russia.
Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, China Jiliang University, Hangzhou 310018, China.
Phys Chem Chem Phys. 2022 Jun 29;24(25):15349-15356. doi: 10.1039/d2cp01543a.
Crystalline inorganic nanoparticles doped with rare earth ions are widely used in a variety of scientific and industry applications due to the unique spectroscopic properties. The temperature dependence of their luminescence parameters makes them promising candidates for self-referencing thermal sensing. Here we report single phase YVO nanoparticles doped with different pairs of rare earth ions (Nd/Er, Tm/Er and Nd/Tm) for contactless ratiometric thermometry within a wide temperature range of 298-573 K. The presence of dual luminescence centers in the optical thermometer allows one to circumvent the fundamental limitation of sensitivity inherent to thermometers based on thermally coupled levels. Important parameters for temperature sensing, such as relative thermal sensitivity and temperature resolution, were calculated for all synthesized samples and compared with the literature data. The YVO:Tm,Er sample displayed a relative sensitivity of 0.28% K at room temperature, and the YVO:Nd,Er phosphor exhibited a high sensitivity of 0.56% K at 573 K, while YVO:Nd,Tm demonstrated sub-degree thermal resolution. These findings demonstrate the good potential of dual-center ratiometric YVO thermometers and open the way toward future enhancement of their thermometric performances through variation of the doping concentration.
掺杂稀土离子的结晶无机纳米颗粒因其独特的光谱特性而被广泛应用于各种科学和工业领域。其发光参数对温度的依赖性使其成为自参考热传感的有前途的候选材料。在此，我们报道了掺杂不同稀土离子对（钕/铒、铥/铒和钕/铥）的单相YVO纳米颗粒，用于在298 - 573 K的宽温度范围内进行非接触式比率测温。光学温度计中双发光中心的存在使得人们能够规避基于热耦合能级的温度计固有的灵敏度基本限制。针对所有合成样品计算了温度传感的重要参数，如相对热灵敏度和温度分辨率，并与文献数据进行了比较。YVO:Tm,Er样品在室温下显示出0.28% K的相对灵敏度，YVO:Nd,Er荧光粉在573 K时表现出0.56% K的高灵敏度，而YVO:Nd,Tm表现出亚度热分辨率。这些发现证明了双中心比率YVO温度计的良好潜力，并为通过改变掺杂浓度来进一步提高其测温性能开辟了道路。
