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Title: Up-conversion effect of Er- and Yb-doped ZnO thin films
Author: Lluscà Jané, Marta
López Vidrier, Julià
Antony, Aldrin
Hernández Márquez, Sergi
Garrido Fernández, Blas
Bertomeu i Balagueró, Joan
Keywords: Òxid de zinc
Terres rares
Propietats òptiques
Pel·lícules fines
Zinc oxide
Rare earths
Optical properties
Thin films
Issue Date: 1-Jul-2014
Publisher: Elsevier B.V.
Abstract: Visible up-conversion in ZnO:Er and ZnO:Er:Yb thin films deposited by RF magnetron sputtering under different O2-rich atmospheres has been studied. Conventional photoluminescence (325 nm laser source) and up-conversion (980 nm laser source) have been performed in the films before and after an annealing process at 800 °C. The resulting spectra demonstrate that the thermal treatment, either during or post-deposition, activates optically the Er3+ ions, being the latter process much more efficient. Moreover, the atmosphere during deposition was also found to be an important parameter, as the deposition under O2 flow increases the optical activity of Er+3 ions. In addition, the inclusion of Yb3+ ions into the films has shown an enhancement of the visible up-conversion emission at 660 nm by a factor of 4, which could be associated to either a better energy transfer from the 2F5/2 Yb level to the 4I11/2 Er one, or to the prevention of having Er2O3 clustering in the films.
Note: Versió postprint del document publicat a:
It is part of: Thin Solid Films, 2014, vol. 562, p. 456-461
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ISSN: 0040-6090
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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