The enhanced 1830 nm emission in Yb/Tm:NaYF<inf>4</inf>@NaYF<inf>4</inf> active-core/inert-shell nanocrystals

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Journal Article
Materials Letters, 2017, 189 pp. 35 - 37
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© 2016 Elsevier B.V. The strong 1830 nm emission is realized in Yb/Tm:NaYF4@Yb:NaYF4 core/shell nanocrystals for the first time. The optimal Tm3+ concentration, shell thickness and composition respectively are 2 mol%, 6.5 nm and inert NaYF4. In comparison with Yb/Tm:NaYF4 nanocrystals, the luminescence intensity of Yb/Tm:NaYF4@NaYF4 core/shell nanocrystals enhances about 160 times.
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