Issue 22, 2016

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

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

Supplementary files

Article information

Article type
Paper
Submitted
08 Apr 2016
Accepted
19 Apr 2016
First published
19 Apr 2016

J. Mater. Chem. C, 2016,4, 4905-4911

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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