pH Mediated Control Synthesis of Lanthanide-Doped YPO4 Upconversion Nano/Microcrystals
- 1 Harbin Institute of Technology, China
- 2 Harbin Huigong Technology Co., Ltd., China
- 3 The State University of New York at Buffalo, United States
Copyright: © 2020 Meiling Tan, Shuwei Hao, Xiangbin Meng, Jing Liu, Yunfei Shang, Chunhui Yang and Guanying Chen. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
A pH-mediated rational control over the phase transformation, morphology and size of lanthanide doped YPO4 nano/microcrystals has been accomplished using a hydrothermal route. The morphology of the resulting particles evolves from the spheres, to the nanoflakes and finally to the nanorods when increasing the pH value of the reaction solution from 1 to 9, while the induction of crystal phase transformation from a tetragonal structure to a hexagonal structure takes place at pH = 5. When excited at 980 nm, the hexagonal phase YPO4•0.8H2O: 18%Yb3+, 2%Er3+ nanoflakes prepared at pH = 7 exhibit the strongest UC emission intensity among investigated samples of varying size, phase and morphologies. This work provides a paradigm on the controlled synthesis of lanthanide doped upconverting orthophosphates, which hold great promise for various photonic and biophotonic applications.
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