RT Journal Article
T1 Synthesis of new non-covered and silica-covered Y0.9Tm0.1-xYbxVO4 nanophosphors with emission in the visible and NIR ranges
A1 Lozano, Yaiza
A1 Fernández-Ramos, Miguel
A1 Rapp, María
A1 Alcolea Palafox, Mauricio
A1 Ortiz-Rivero, Elisa
A1 Muñoz-Ortiz, Tamara
A1 Isasi Marín, Josefa
AB The development of new materials of interest in the bioimaging field is a relevant topic in current research. We present and study here novel non-covered and silica-covered Y0.9Tm0.1-xYbxVO4 samples with x = 0, 0.01, 0.05 and 0.09 that were prepared by hydrothermal synthesis. For comparison purposes, the study of Y0.9Tm0.1VO4 sample synthesized by the sol-gel method was also included. The relationships between the synthesis method, dopant content and luminescence emission were systematically studied by X-ray diffraction (XRD), FTIR spectroscopy and transmission electron microscopy (TEM). XRD profiles and FTIR spectra confirm the zircon-type structure of the obtained samples. Particles of two different morphologies were found in TEM images of uncoated samples, some spherical with sizes between 42 and 50 nm and others elongated. A shell thickness between 8 and 13 nm was also observed in silica-covered samples. Photoluminescence studies of our samples revealed emission in the NIR and visible ranges. Under excitation at 790 nm, the spectra of thulium-doped samples showed the characteristic emission band of Tm3+ ions. Substitution of thulium by ytterbium successfully led to an up-conversion emission under excitation at 980 nm. Finally, the fluorescent emission study in the NIR of samples that could be more biocompatible demonstrated that they are suitable for use as luminescent thermometers in the physiological temperature range.
PB Elsevier
SN 0022-2313
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/100446
UL https://hdl.handle.net/20.500.14352/100446
LA eng
NO Lozano, Y., et al. «Synthesis of New Non-Covered and Silica-Covered Y0.9Tm0.1-xYbxVO4 Nanophosphors with Emission in the Visible and NIR Ranges». Journal of Luminescence, vol. 257, mayo de 2023, p. 119708.  https://doi.org/10.1016/j.jlumin.2023.119708.
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO Instituto de Salud Carlos III
NO Comunidad de Madrid 
NO Universidad Autónoma de Madrid
NO European Commission
DS Docta Complutense
RD 1 sept 2024