Marciniak L, Prorok K, Francés-Soriano L, Pérez-Prieto J, Bednarkiewicz A
Institute of Low Temperature and Structure Research, PAS, ul. Okólna 2, 50-422 Wrocław, Poland.
Instituto de Ciencia Molecular (ICMol)/Departamento de Química Orgánica, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Valencia, Spain.
Nanoscale. 2016 Mar 7;8(9):5037-42. doi: 10.1039/c5nr08223d.
The chemical architecture of lanthanide doped core-shell up-converting nanoparticles can be engineered to purposely design the properties of luminescent nanomaterials, which are typically inaccessible to their homogeneous counterparts. Such an approach allowed to shift the up-conversion excitation wavelength from ∼980 to the more relevant ∼808 nm or enable Tb or Eu up-conversion emission, which was previously impossible to obtain or inefficient. Here, we address the issue of limited temperature sensitivity range of optical lanthanide based nano-thermometers. By covering Yb-Er co-doped core nanoparticles with the Yb-Nd co-doped shell, we have intentionally combined temperature dependent Er up-conversion together with temperature dependent Nd → Yb energy transfer, and thus have expanded the temperature response range ΔT of a single nanoparticle based optical nano-thermometer under single ∼808 nm wavelength photo-excitation from around ΔT = 150 K to over ΔT = 300 K (150-450 K). Such engineered nanocrystals are suitable for remote optical temperature measurements in technology and biotechnology at the sub-micron scale.
镧系掺杂的核壳型上转换纳米粒子的化学结构可以通过设计来特意调控发光纳米材料的性质，而这些性质通常是其均匀对应物所不具备的。这种方法能够将上转换激发波长从约980纳米转变为更合适的约808纳米，或者实现铽或铕的上转换发射，而这在之前是无法获得或效率低下的。在此，我们解决了基于镧系光学纳米温度计温度灵敏度范围有限的问题。通过用镱-钕共掺杂壳层包覆镱-铒共掺杂的核纳米粒子，我们有意地将与温度相关的铒上转换和与温度相关的钕→镱能量转移结合起来，从而在单一约808纳米波长光激发下，将基于单个纳米粒子的光学纳米温度计的温度响应范围ΔT从约ΔT = 150 K扩展到超过ΔT = 300 K（150 - 450 K）。这种经过设计的纳米晶体适用于技术和生物技术中亚微米尺度的远程光学温度测量。
