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Title

Down- and up-conversion emissions in Er3+–Yb3+ codoped TeO2–ZnO–ZnF2 glasses

AuthorsMiguel, A.; Arriandiaga, M. A.; Morea, Roberta ; Fernández, Joaquín ; Gonzalo de los Reyes, José; Balda, Rolindes
KeywordsFluorotellurite glasses
Er3+/Yb3+ codoping
Energy transfer
Upconversion
Laser spectroscopy
Issue Date7-Oct-2014
PublisherElsevier
CitationJournal of Luminescence 158: 142-148 (2015)
AbstractIn this work, we report the near infrared and upconversion emissions of Er3+–Yb3+ codoped fluorotellurite TeO2–ZnO–ZnF2 glasses for different YbF3 concentrations ranging between 0.5 and 2 wt%. The study includes absorption and emission spectra and lifetime measurements for the infrared and visible fluorescence. The energy transfer between Yb3+ and Er3+ ions is confirmed by the temporal behavior of the near-infrared luminescence of Yb3+ ions as well as by the enhancement of the 1532 nm emission of Er3+ ions in the codoped samples. The Yb3+→Er3+ energy transfer efficiency is calculated from the Yb3+ lifetimes in single and codoped samples. Back transfer from Er3+ to Yb3+ ions is present under near infrared and visible excitation of Er3+ ions at 798 and 488 nm respectively. An enhancement of the visible upconversion fluorescence is also observed in the codoped samples due to energy transfer from Yb3+ to Er3+ ions. The standardized value for the efficiency of the green upconversion emission is 1.06×10−4 for the codoped sample with 2 wt% of YbF3 which is comparable to that reported in lead–zinc–tellurite glasses. The possible upconversion processes and mechanisms leading to the population of several excited levels are discussed.
Description7 págs.; 10 figs.
Publisher version (URL)http://dx.doi.org/10.1016/j.jlumin.2014.09.052
URIhttp://hdl.handle.net/10261/130626
DOI10.1016/j.jlumin.2014.09.052
Identifiersdoi: 10.1016/j.jlumin.2014.09.052
issn: 0022-2313
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