In the present work, we make a comparison of Pr³⁺:LaF₃ and Pr³⁺:LiYF₄ luminescent nano- and microthermometer performances. We studied Pr³⁺:LaF₃ nanoparticles, synthesized via co-precipitation method (further Pr³⁺:LaF₃ (co-precipitation)), Pr³⁺:LaF₃ nanoparticles, synthesized via hydrothermal method (further Pr³⁺:LaF₃ (hydrothermal)), and Pr³⁺:LaF₃ microparticles as well as Pr³⁺:LiYF₄ nanoparticles, synthesized via hydrothermal method (further Pr³⁺:LiYF₄ nanoparticles) and Pr³⁺:LaF₃ microparticles. According to the X-ray diffraction, Pr³⁺:LaF₃ (co-precipitation) and Pr³⁺:LaF₃ (hydrothermal) nanoparticles are hexagonal-structured nanocrystals. Pr³⁺:LiYF₄ nanoparticles are tetragonal-structured nanocrystals. The average diameters of Pr³⁺:LaF₃ (co-precipitation), Pr³⁺:LaF₃ (hydrothermal), and Pr³⁺:LiYF₄ nanoparticles are 13.9, 19.4, and 33.3 nm, respectively. The Pr³⁺:LaF₃ (co-precipitation) and Pr³⁺:LaF₃ (hydrothermal) nanoparticles demonstrate broadband luminescence caused by crystal lattice defects (luminescence background). This luminescence background notably decreases the temperature sensitivity of these samples. The luminescent background removing procedure significantly complicates the signal processing procedure. Pr³⁺:LaF₃ microparticles, Pr³⁺:LiYF₄ nanoparticles, and Pr³⁺:LaF₃ microparticles do not demonstrate this undesirable phenomenon. The absolute temperature sensitivity S_a of Pr³⁺:LiYF₄ nanoparticles, Pr³⁺:LiYF₄ microparticles, and Pr³⁺:LaF₃ microparticles at 300 K are 0.0117 ± 0.0010, 0.0106 ± 0.0010, and 0.0102 ± 0.0012 K⁻¹, respectively. Although the values of S_a are very close for these samples, the nanosized dimensionality of Pr³⁺:LiYF₄ nanoparticles allows achieving high spatial resolution and expanding the fields of application of Pr³⁺:LiYF₄ nanoparticles.

在当前的工作中，我们比较了Pr ³⁺：LaF ₃和Pr ³⁺：LiYF ₄发光纳米和微温度计的性能。我们研究了通过共沉淀法合成的Pr ³⁺：LaF ₃纳米粒子（进一步的Pr ³⁺：LaF ₃（共沉淀）），通过水热法合成的Pr ³⁺：LaF ₃纳米粒子（进一步Pr ³⁺：LaF ₃（水热））和Pr ³⁺：LaF ₃微粒以及Pr ³⁺：LiYF ₄通过水热法合成的纳米粒子（进一步的Pr ³⁺：LiYF ₄纳米粒子）和Pr ³⁺：LaF ₃粒子。根据X射线衍射，Pr ³⁺：LaF ₃（共沉淀）和Pr ³⁺：LaF ₃（水热）纳米颗粒是六方结构的纳米晶体。Pr ³⁺：LiYF ₄纳米颗粒是四方结构的纳米晶体。Pr ³⁺：LaF ₃（共沉淀），Pr ³⁺：LaF ₃（水热）和Pr ³⁺：LiYF ₄的平均直径纳米粒子分别为13.9、19.4和33.3 nm。Pr ³⁺：LaF ₃（共沉淀）和Pr ³⁺：LaF ₃（水热）纳米粒子显示出由晶格缺陷引起的宽带发光（发光背景）。该发光背景显着降低了这些样品的温度敏感性。发光背景去除程序使信号处理程序显着复杂化。Pr ³⁺：LaF ₃微粒，Pr ³⁺：LiYF ₄纳米颗粒和Pr ³⁺：LaF ₃微粒没有表现出这种不良现象。Pr ³⁺：LiYF ₄纳米颗粒，Pr ³⁺：LiYF ₄微粒和Pr ³⁺：LaF ₃微粒在300 K时的绝对温度灵敏度S _a为0.0117±0.0010、0.0106±0.0010和0.0102±0.0012 K ^-1， 分别。尽管对于这些样品，S _a的值非常接近，但是Pr ³⁺：LiYF ₄纳米颗粒的纳米尺寸可以实现高空间分辨率并扩大Pr ³⁺：LiYF ₄纳米颗粒的应用领域。