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Issue 22, 2016
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Enhanced 808 nm driven Ce3+ doped red-emitting upconversion nanocrystals by intercalated nanostructures

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Abstract

We report the red but weak upconversion luminescence of core–shell–shell structured upconversion nanocrystals (NaYF4:Yb/Ho/Ce@NaYF4:Nd@NaYF4) under excitation at 808 nm due to high surface Ce3+ concentration in core nanocrystals hindering the energy transfer from the Nd3+ shell to the Yb3+ core. 10.2-fold upconversion luminescence enhancement was achieved by conquering the negative effects of non-uniform Ce3+ distribution phenomena on upconversion processes via intercalating NaYF4:Yb/Ho/Ce, designed as the shell, into the Nd3+ sensitized nanostructure (NaYF4:Nd@NaYF4:Yb/Ho/Ce@NaYF4:Nd@NaYF4:Yb/Ho/Ce@NaYF4). The intercalation nanostructured upconversion nanocrystals show intense red upconversion luminescence with a red-to-green ratio of 5.0. Bright red upconversion luminescence of the Ce3+ doped intercalation nanostructured upconversion nanocrystals embedded in biological tissues can be visualized even at a depth of 5 mm illuminated by 808 nm laser light. High efficiency 808 nm driven red-emitting upconversion nanocrystals are promising for bio-applications.

Graphical abstract: Enhanced 808 nm driven Ce3+ doped red-emitting upconversion nanocrystals by intercalated nanostructures

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Publication details

The article was received on 08 Apr 2016, accepted on 19 Apr 2016 and first published on 19 Apr 2016


Article type: Paper
DOI: 10.1039/C6TC01430E
Citation: J. Mater. Chem. C, 2016,4, 4905-4911

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    Enhanced 808 nm driven Ce3+ doped red-emitting upconversion nanocrystals by intercalated nanostructures

    J. Shen, J. Lu, J. Tu, X. Ouyang and H. Li, J. Mater. Chem. C, 2016, 4, 4905
    DOI: 10.1039/C6TC01430E

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