Color tunability of the upconversion emission in Er–Yb doped the wide band gap nanophosphors ZrO2 and Y2O3

Er3+/Yb3+ codoped Y2O3 and ZrO2 have favourable physical properties, such as a wide band gap between 5.6 and 7.0 eV, and ease of synthesis in the nanometre regime. In particular, the intensity of the visible rare earth luminescence depends on the dopant concentration, crystalline phase and size of t...

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Published inMaterials science & engineering. B, Solid-state materials for advanced technology Vol. 174; no. 1-3; pp. 177 - 181
Main Authors Meza, O, Diaz-Torres, L A, Salas, P, De, la Rosa E, Solis, D
Format Journal Article
LanguageEnglish
Published 25.10.2010
Subjects
Color
Colour
Emission
Mathematical models
Nanomaterials
Nanostructure
Rare earth metals
Upconversion
White light
Zirconium dioxide
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Summary:Er3+/Yb3+ codoped Y2O3 and ZrO2 have favourable physical properties, such as a wide band gap between 5.6 and 7.0 eV, and ease of synthesis in the nanometre regime. In particular, the intensity of the visible rare earth luminescence depends on the dopant concentration, crystalline phase and size of the nanocrystals. As a result, it is possible to control the emission colour between red and green by adjusting the Er and Yb dopant concentrations. Based on a stationary solution of the rate equations that govern the luminescence emission, a simple model was derived that allows the prediction of the overall colour emission depending on the Yb and Er concentration. In addition, the model allows the facile quantification of the upconversion mechanisms responsible of the visible colour emission in these nanophosphors under 970 nm excitation.
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ISSN:0921-5107
DOI:10.1016/j.mseb.2010.03.015