Abstract
For the first time, La2O2CN2:Yb3+/Tm3+ upconversion luminescence nanofibers and nanobelts were successfully fabricated via cyanamidation of the respective relevant La2O3:Yb3+/Tm3+ nanofibers and nanobelts which were obtained by calcining the electrospinning made PVP/[La(NO3)3+Yb(NO3)3+Tm(NO3)3] composite nanofibers and nanobelts. The morphologies, structures, and properties of the nanofibers and nanobelts are investigated. The diameters of La2O2CN2:Yb3+/Tm3+ nanofibers and width of La2O2CN2:Yb3+/Tm3+ nanobelts with the thickness of 112 nm are 109 ± 4.3 nm and 1.8 ± 0.2 μm at 95% confidence level, respectively. Upconversion luminescent analysis manifests that La2O2CN2:Yb3+/Tm3+ nanofibers and nanobelts emit intense blue emissions around 476 nm corresponding to 1G4→3H6 energy level transitions of Tm3+ ions under the excitation of a 980-nm diode laser. For the La2O2CN2:30%Yb3+/x%Tm3+ nanofibers, the blue emission intensity increases when the Tm3+ concentration is increased from 0.1 to 0.5% and then decreases as the Tm3+ concentration is further increased from 0.5 to 1.0%, so the Tm3+ optimum concentration is 0.5%. For the La2O2CN2:y%Yb3+/0.5%Tm3+ nanofibers, when the concentration of Tm3+ is fixed at 0.5%, the blue emission intensity increases when the Yb3+ concentration is increased from 5 to 30% and then decreases as the Yb3+ concentration is further increased from 30 to 40%. Therefore, the optimum concentration of Yb3+ is 30%. Thus, the optimum molar concentration ratio of Yb3+ to Tm3+ ions is 60:1 in the as-prepared La2O2CN2:Yb3+/Tm3+ nanofibers. The formation mechanisms of the La2O2CN2:Yb3+/Tm3+ nanostructures are also proposed. The novel technique can be applied to prepare other rare earth oxycyanamide nanostructures of various morphologies.
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Acknowledgements
This work was financially supported by National Natural Science Foundation of China (51573023, 50972020), Natural Science Foundation of Jilin Province (20170101101JC), Science and Technology Research Planning Project of the Education Department of Jilin Province during the 13th five-year plan period (JJKH20170608KJ), and Youth Foundation of Changchun University of Science and Technology (No. XQNJJ-2016-01).
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Zhou, L., Li, D., Dong, X. et al. La2O2CN2:Yb3+/Tm3+ nanofibers and nanobelts: novel fabrication technique, structure and upconversion luminescence. J Mater Sci: Mater Electron 28, 16282–16291 (2017). https://doi.org/10.1007/s10854-017-7534-x
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DOI: https://doi.org/10.1007/s10854-017-7534-x