Journal
JOURNAL OF LUMINESCENCE
Volume 154, Issue -, Pages 111-115Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2014.04.016
Keywords
Luminescence; NaGd(WO4)(2) nanoparticles; Hydrothermal method; Erbium; Ytterbium
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Funding
- Natural Science Foundation of Shaanxi Province [2013JQ6020]
- National College Students' innovation and entrepreneurship training program [201310710110]
- Fundamental Research Funds for the Central Universities [CHD2012JCO33]
- National Natural Science Foundation of China [51102023]
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The Er3+/Yb3+ co-doped NaGd(WO4)(2) nanoparticles have been prepared by a simply hydrothermal synthesis procedure. The crystal structures and morphologies of the products were characterized by XRD, SEM and FT-IR spectroscopy. The average grain size of these samples depended on the annealing temperature, increasing with the increase of the temperature. The intense visible upconversion and near infrared luminescence of the Er3+/Yb3+ co-doped NaGd(WO4)(2) nanoparticles under 975 nm excitation could be observed. The luminescence intensities of the samples depended on the size of the nanoparticles and Yb3+ concentration. The transition mechanisms of the upconversion emission can be ascribed to a two-photon absorption process. (C) 2014 Elsevier B.V. All rights reserved.
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