Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15431
Title: Monodispersed LaF3 nanocrystals : shape-controllable synthesis, excitation-power-dependent multi-color tuning and intense near-infrared upconversion emission
Authors: Rao, L
Lu, W
Ren, G
Wang, H
Yi, Z
Liu, H
Zeng, S
Keywords: Controlled synthesis
Multicolor tuning
Nanorod
Upconversion nanocrystal
Issue Date: 2014
Publisher: Institute of Physics Publishing
Source: Nanotechnology, 2014, v. 25, no. 6, 65703 How to cite?
Journal: Nanotechnology 
Abstract: In this study, monodispersed and high-quality hexagonal phase LaF 3 nanocrystals with different shapes and sizes were synthesized by a solvothermal method using oleic acid as the stabilizing agent. The as-prepared LaF3 nanocrystals were characterized by transmission electron microscopy (TEM), x-ray diffraction (XRD), and analysis of the upconversion spectra. The TEM results reveal that the samples present high uniformity and monodispersity and are self-assembled into a two-dimensional ordered array. Moreover, the shape, size and structure of the nanocrystals can be readily tuned by adjusting the NaF content. With increasing content of NaF, the shape of the LaF3 nanocrystals changed from particle to rod and the size gradually increased. More importantly, high NaF content favors the formation of one-dimensional nanorods. High Y b3+ and Er3+ content is beneficial to synthesizing the hexagonal phase of NaLaF4 nanocrystals. Furthermore, the TEM results show that the shape and size of the LaF3 nanocrystals can also be tuned by doping lanthanide ions, which provides a new route for size and shape control of nanocrystals. In addition, LaF3 nanocrystals co-doped with Y b3+/Tm3+ present efficient near-infrared (NIR)-NIR upconversion luminescence. More importantly, the upconversion luminescent colors can be readily tuned from blue-white to blue by adjusting the excitation power. Therefore, it is expected that these LaF3 nanocrystals with well-controlled shape, size and NIR-NIR upconversion emission have potential applications in biomedical imaging fields.
URI: http://hdl.handle.net/10397/15431
ISSN: 0957-4484
EISSN: 1361-6528
DOI: 10.1088/0957-4484/25/6/065703
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