title: A broadening temperature sensitivity range with a core-shell YbEr@YbNd double ratiometric optical nanothermometer.
abstract: 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.
authors: Institute of Low Temperature and Structure Research, PAS, ul. Okólna 2, 50-422 Wrocław, Poland. a.bednarkiewicz@int.pan.wroc.pl.
authors: L
authors: L
authors: Marciniak
authors: Institute of Low Temperature and Structure Research, PAS, ul. Okólna 2, 50-422 Wrocław, Poland. a.bednarkiewicz@int.pan.wroc.pl and Wrocław Research Center EIT+, ul. Stabłowicka 147, 54-066 Wrocław, Poland.
authors: K
authors: K
authors: Prorok
authors: Instituto de Ciencia Molecular (ICMol)/Departamento de Química Orgánica, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Valencia, Spain.
authors: L
authors: L
authors: Francés-Soriano
authors: Instituto de Ciencia Molecular (ICMol)/Departamento de Química Orgánica, Universidad de Valencia, C/Catedrático José Beltrán 2, 46980, Paterna, Valencia, Spain.
authors: J
authors: J
authors: Pérez-Prieto
authors: Institute of Low Temperature and Structure Research, PAS, ul. Okólna 2, 50-422 Wrocław, Poland. a.bednarkiewicz@int.pan.wroc.pl and Wrocław Research Center EIT+, ul. Stabłowicka 147, 54-066 Wrocław, Poland.
authors: A
authors: A
authors: Bednarkiewicz