Effect of the Fe3+ concentration on the upconversion luminescence in NaGdF4:Yb3+, Er3+ nanorods prepared by a hydrothermal method
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In this paper, uniform NaGdF4:Yb3+, Er3+ nanorods doped with Fe3+ were synthesized by a facile hydrothermal method. The prepared NaGdF4:Yb3+, Er3+ doped with Fe3+ displayed hexagonal phase structure from XRD pattern and uniform nanorods with narrow size distribution from TEM. The signal of Fe3+ is accompanied with the Yb3+ and Er3+ from EDX line-scanning, which was confirmed that Fe3+ was doped successfully. The NaGdF4:Yb3+, Er3+ nanorods doped with Fe3+ show absorption of near-infrared region from UV–Vis absorption spectra. The upconversion luminescence intensity enhances with increasing content of Fe3+ under 980 nm excitation. When stoichiometric ratio of Fe3+ is 20 mol%, the strongest upconversion emission intensity could be obtained. But the upconversion luminescence would become weak when the stoichiometric ratio of Fe3+ is above 20 mol%. Based on above analysis, it is inferred that there is energy conversion between Fe3+ and rare earth ions by the luminescence mechanism. In this work, it provides a facile method for preparation of NaGdF4:Yb3+, Er3+ nanorods, which displays improving upconversion luminescence by Fe3+ doping.
The work was financially supported by the National Natural Science Foundation (Nos. 51403114 and 51473082), Natural Science Foundation of Shandong Province (BS2014CL025), China Postdoctoral Science Foundation (No. 2014M56053), Postdoctoral Innovation Fund of Shandong Province (201402015), Program for Introducing Talents of Discipline to Universities (“111” plan), State Key Project of International Cooperation Research (2016YFE0110800).
- 2.Zhang Y, Xu S, Li X, Zhang J, Sun J, Tong L, Zhong H, Xia H, Hua R, Chen B (2018) Improved LRET-based detection characters of Cu2+ using sandwich structured NaYF4@NaYF4:Er3+/Yb3+@NaYF4 nanoparticles as energy donor. Sens Actuators B Chem 257:829–838. https://doi.org/10.1016/j.snb.2017.11.045 CrossRefGoogle Scholar
- 15.Zhu Q, Song C, Li X, Sun X, Li JG (2018) Up-conversion monodispersed spheres of NaYF4:Yb(3+)/Er(3+): green and red emission tailoring mediated by heating temperature, and greatly enhanced luminescence by Mn(2+) doping. Dalton Trans 47(26):8646–8655. https://doi.org/10.1039/c8dt00792f CrossRefGoogle Scholar
- 22.Tian Y, Tian Y, Huang P, Wang L, Shi Q, Ce Cui (2016) Effect of Yb3+ concentration on upconversion luminescence and temperature sensing behavior in Yb3+/Er3+ co-doped YNbO4 nanoparticles prepared via molten salt route. Chem Eng J 297:26–34. https://doi.org/10.1016/j.cej.2016.03.149 CrossRefGoogle Scholar