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Journal of Nanomaterials
Volume 2014 (2014), Article ID 903208, 11 pages
http://dx.doi.org/10.1155/2014/903208
Research Article

Upconversion luminescence and Visible-Infrared Properties of β-NaLuF4:Er3+ Microcrystals Synthesized by the Surfactant-Assisted Hydrothermal Method

1College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2School of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China

Received 21 February 2014; Revised 20 May 2014; Accepted 22 May 2014; Published 18 June 2014

Academic Editor: Alireza Talebitaher

Copyright © 2014 Han Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report the obtention of β-NaLuF4 microcrystals doped with Er3+ ions by the surfactant-assisted hydrothermal method. It was found that shape modulation could be realized by changing the surfactants (ethylenediaminetetraacetic acid, polyvinylpyrrolidone, and trisodium citrate) introduced into the reaction system. The surfactants can strongly control the size and shape of as-prepared samples through absorbing on the surface of primary particles and/or coordinating with rare earth ions. Hexagonal prism-like β-NaLuF4:Er3+ microcrystals demonstrate intense upconverted luminescence (UCL) pumped by 1.54 μm infrared laser in comparison with hexagonal tube-like, disk-like, and sphere-like microcrystals, which exhibit great distinction. More interestingly, a synergistic effect combined dual mode (i.e., downconversion and upconversion) with 8% absolute enhancement rate of the red emission centered at 659 nm (4F9/2 4I15/2) is witnessed in hexagonal prisms β-NaLuF4:Er3+ phosphors by employing the dual wavelength 416 nm and 1.54 μm excitation source for the first time.