@article{10902/28733,
year = {2022},
month = {11},
url = {https://hdl.handle.net/10902/28733},
abstract = {The structural and spectroscopic properties of (Eu1-xYbx)2O3 nanocrystals with cubic (C-type) and monoclinic (B-type) crystalline structures have been studied. NCs have been synthetized by the sol-gel Pechini method and characterized at room temperature by X-ray diffraction, transmission electron microscopy, diffuse reflectance, Raman spectroscopy and photoluminescence techniques. NIR emission from Yb3+ ions has been observed in both C- and B-type NCs upon excitation of Eu3+ ions at 532 nm, where Yb3+ ions do not absorb photons. This fact reveals that an efficient non-resonant energy transfer process from Eu3+ to Yb3+ takes place, allowing to obtain simultaneous visible and NIR emissions under visible excitation. The decay curves of the 5D0 → 7F2 Eu3+ emission of C-type NCs corroborate this phenomenon since the Eu3+ lifetime has been found to decrease as the Yb3+ content increases. Finally, we discuss the use of the Eu3+ luminescence as a structural probe to distinguish between different RE2O3 polymorphs.},
organization = {M.T Candela would like to thank University of Cantabria for the pre-doctoral grant “Concepción Arenal”, co-financed by the Government of Cantabria. The authors acknowledge financial support from the European Union (FET Open project NCLas, ref. H2020-EU829161) and the Spanish Ministerio de Ciencia, Innovacion y Universidades (PGC2018–101464-B-I00).},
publisher = {Elsevier Ltd},
publisher = {Journal of Alloys and Compounds, 2022, 921, 166043},
title = {Non-resonant energy transfer from Eu3+ to Yb3+ in C-type and B-type (Eu1-xYbx)2O3 nanocrystals},
author = {Candela de Aroca, Marina Teresa and Aguado Menéndez, Fernando and Diego Rucabado, Andrea and González Gómez, Jesús Antonio and Valiente Barroso, Rafael},
}