Issue 2, 2016
From the journal:

Journal of Materials Chemistry C

Controlled size and morphology, and phase transition of YF3:Yb3+,Er3+ and YOF:Yb3+,Er3+ nanocrystals for fine color tuning†

Yongsheng Zhu,ab   Wen Xu,*bc   Shaobo Cui,b   Mao Liu,d   Cheng Lu,a   Hongwei Song*b  and  Dong-Hwan Kim*c  

* Corresponding authors

a Department of Physics, Nanyang Normal University, Nanyang 473061, China

b State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China
E-mail: wen_xu09@163.com, songhw@jlu.edu.cn

c School of Chemical and Biomedical Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
E-mail: dhkim@ntu.edu.sg

d School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

Abstract

Lanthanide rare-earth (RE) based upconversion nanocrystals (UCNCs) have the ability to generate visible emission as well as a wide range of applications under near-infrared excitation. However, each lanthanide ion has a unique set of energy levels and generally exhibits a set of sharp emission peaks. Nowadays, it is very important to finely tune the upconversion (UC) properties through controlling the particle size, crystalline phase and shape of UCNCs. Herein, we reported the systematic synthesis and fine control of monodisperse rare-earth doped fluoride and oxyfluoride nanocrystals (NCs) in the same reaction system. When the ratios of oleic acid (OA) to oleylamine (OM) decreased from 4 : 1 to 3 : 8, the shapes of NCs changed from rhombic nanoplates to small spherical nanoparticles (~2 nm), while the crystalline phases changed from the orthorhombic phase (YF3) to the tetragonal phase (YOF). Furthermore, it is interesting to observe that the emission color changed from green to red with the transformation of both the crystalline phase and shape, which can broaden the applications of rare-earth based nanomaterials ranging from displays to bioimaging.

Graphical abstract: Controlled size and morphology, and phase transition of YF3:Yb3+,Er3+ and YOF:Yb3+,Er3+ nanocrystals for fine color tuning

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Article information

DOI
https://doi.org/10.1039/C5TC03473F
Article type
Paper
Submitted
23 Oct 2015
Accepted
30 Nov 2015
First published
30 Nov 2015

J. Mater. Chem. C, 2016,4, 331-339

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Controlled size and morphology, and phase transition of YF3:Yb3+,Er3+ and YOF:Yb3+,Er3+ nanocrystals for fine color tuning

Y. Zhu, W. Xu, S. Cui, M. Liu, C. Lu, H. Song and D. Kim, J. Mater. Chem. C, 2016, 4, 331 DOI: 10.1039/C5TC03473F

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