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Non-resonant energy transfer from Eu3+ to Yb3+ in C-type and B-type (Eu1-xYbx)2O3 nanocrystals

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.

 Autoría: Candela M.T., Aguado F., Diego-Rucabado A., González J.A., Valiente R.,

 Fuente: Journal of Alloys and Compounds, 2022, 921, 166043

 Editorial: Elsevier Ltd

 Fecha de publicación: 15/11/2022

 Nº de páginas: 13

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jallcom.2022.166043

 ISSN: 0925-8388,1873-4669

 Proyecto español: PGC2018-101464-B-I00

 Proyecto europeo: info:eu-repo/grantAgreement/EC/H2020/629161/EU/NanoCrystals in Fibre Lasers/NCLas/

 Url de la publicación: https://doi.org/10.1016/j.jallcom.2022.166043