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Keyword:upconversion luminescence  yttrium sodium tungstate: rare earth ions 
Year,volume(Issue):page number:2018,46(1):0-0
Nd3+/Yb3+/Tm3+ co-doped NaY(WO4)2 nanocrystals were prepared by a hydrothermal method. The crystal structure,morphology and up-conversion luminescent properties of samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and luminescence spectroscopy, respectively. The results indicate that all the synthesized samples are a pure tetragonal phase of NaY(WO4)2, and the particle sizes are 50–55 nm. The up-conversion nanoparticles have a small size,well-dispersive property and water solubility by adding polyethylene glycol (i.e., PEG-2000) as a surfactant. For NaY(WO4)2:Nd3+/Yb3+/Tm3+, a blue emission peak at 469 nm and a green emission peak at 539 nm appear under  808-nm excitation. The blue emitting light results from the energy level transition of 1G4?3H6 of Tm3+, green emitting light is from the transition of 1D2?3H5 of Tm3+. In addition, the energy transfer process and the up-conversion luminescence mechanism of Nd3+? Yb3+?Tm3+ in co-doped system were also investigated.
Foundation item:
国家重点研发计划项目(2017YFB0310300);国家自然科学基金(51274052);辽宁省自然科学基金 (201602134);辽宁省教育厅(JDL2016002) 资助项目。
About The Author:
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