Abstract
Terbium doped lanthanum oxybromide (LaOBr:Tb3+) nanoribbons and nanofibers were successfully synthesized by double-crucible bromination of the electrospinning-derived La2O3:Tb3+ nanoribbons and nanofibers using NH4Br powders as the bromine source. The structure and morphology of the samples were investigated by X-ray diffractometry and scanning electron microscopy. The results indicated that LaOBr:Tb3+ nanoribbons and nanofibers were pure tetragonal in structure with space group of P4/nmm. The width of LaOBr:Tb3+ nanoribbons were 2.33 ± 0.33 μm and the diameter of LaOBr:Tb3+ nanofibers was 90.08 ± 15.19 nm. The photoluminescent properties of LaOBr:Tb3+ nanoribbons and nanofibers were also characterized systematically. Under the excitation of 253-nm ultraviolet light, LaOBr:Tb3+ nanostructures exhibit the green emission of predominant peak at 543 nm. The optimum do** molar concentration of Tb3+ ions in the LaOBr:Tb3+ nanoribbons is 5 %. Interestingly, the luminescence intensity of LaOBr:5 %Tb3+ nanofibers is obviously greater than that of LaOBr:5 %Tb3+ nanoribbons under the same measuring conditions. Moreover, the luminescence colors of LaOBr:Tb3+ nanostructures are located in the green region in Commission Internationale de L’Eclairage chromaticity coordinates diagram. The mechanism of double-crucible bromination method was also proposed. This new bromination technique not only can inherit the morphology of rare earth oxides precursor, but also can be used to fabricate pure-phase rare earth oxybromide at low temperature compared with conventional high temperature solid state bromination reaction method. LaOBr:Tb3+ nanostructures are promising nanomaterials for applications in the fields of light display systems and optoelectronic devices.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (NSFC 50972020, 51072026), Specialized Research Fund for the Doctoral Program of Higher Education (20102216110002, 20112216120003), the Science and Technology Development Planning Project of Jilin Province (Grant Nos. 20130101001JC, 20070402, 20060504), the Science and Technology Research Project of the Education Department of Jilin Province during the eleventh five-year plan period (Under Grant No. 2010JYT01), Key Research Project of Science and Technology of Ministry of Education of China (Grant No. 207026).
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Ma, W., Dong, X., Wang, J. et al. Study on terbium doped lanthanum oxybromide luminescent nanoribbons and nanofibers. J Mater Sci: Mater Electron 25, 1657–1663 (2014). https://doi.org/10.1007/s10854-014-1780-y
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DOI: https://doi.org/10.1007/s10854-014-1780-y