Luminescence nanothermometry in the first and second biological windows with Yb, Nd:KGd(WO4)2, Nd:Gd2O3 and Yb, Nd:Gd2O3 nanoparticles

Identifier:  TFM:181

Handle: https://hdl.handle.net/20.500.11797/TFM181

Authors:  Ollé Roselló, Judit

Abstract:
Luminescence nanothermometry in the first and second biological windows with Yb, Nd:KGd(WO4)2, Nd:Gd2O3 and Yb, Nd:Gd2O3 nanoparticles Judit Ollé Roselló Master Program in Nanoscience, Materials and Processes: Chemical Technology at the Frontier, 2015-2016 Supervisors: Dr. Maria Cinta Pujol and Dr. Joan Josep Carvajal. Physics and Crystallography of Materials and Nanomaterials (FiCMA-FiCNA), Universitat Rovira i Virgili. Campus Sescelades, c/ Marcel·lí Domingo, 1 Tarragona, 43007, Spain. Neodymium and Ytterbium codoped monoclinic KGd(WO4)2 and cubic Gd2O3 nanoparticles were synthesized by the modified Pechini sol–gel method and a microwave-assisted hydrothermal method. Under excitation at 808 nm, the 0.5 at. % Yb, 3 at. % Nd:KGd(WO4)2 nanoparticles and 0.5 at. % Yb, 3 at. % Nd3+:Gd2O3 nanoparticles, exhibited strong emission bands at 900 nm and 1075 nm in the near infrared region range, corresponding to the 4F3/2  4I9/2 (Nd3+) and 4F3/2  4I11/2 (Nd3+) electronic transitions, and lying in the first and second biological windows, respectively, and an additional emission band at 1000 nm corresponding to the 2F5/2  2F7/2 (Yb3+) transition, lying in the second biological window. These emissions show properties for thermal sensing in this range of wavelengths, with thermal sensitivities similar to those reported previously for more complex core-shell structures in which the doping ions were located in different layers. The results presented here indicate that the host chosen to host the lanthanide ions has an enormous influence on the thermal sensitivities that can be achieved for luminescence nanothermometry.