Abstract
Tb3+-doped LaOBr nanostructures including nanofibers, nanobelts, and hollow nanofibers were synthesized for the first time via calcinating the electrospun polyvinyl pyrrolidone/[La(NO3)3 + Tb(NO3)3 + NH4Br] composites. X-ray diffraction analysis revealed that LaOBr:Tb3+ nanostructures are tetragonal in structure with space group of P4/nmm. The morphologies and sizes of LaOBr:Tb3+ nanostructures were investigated using scanning electron microscope and transmission electron microscope. Under the excitation of 254-nm ultraviolet light, LaOBr:Tb3+ nanostructures exhibit the green emissions of predominant peak at 543 nm, which is ascribed to 5D4 → 7F5 transition of Tb3+ ions. It is found that the optimum doping concentration of Tb3+ ions in the LaOBr:Tb3+ nanofibers is 3 %. Interestingly, we found that the luminescence intensity of hollow nanofibers is obviously greater than that of nanofibers and nanobelts for LaOBr:Tb3+ under the same measuring conditions. Moreover, the luminescence of LaOBr:Tb3+ nanostructures are located in the green region in Commission Internationale de L’Eclairage chromaticity coordinates diagram. The formation mechanisms of LaOBr:Tb3+ nanofibers, nanobelts, and hollow nanofibers were also proposed. LaOBr:Tb3+ nanostructures are promising nanomaterials for applications in the fields of light display systems and optoelectronic devices.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (NSFC 50972020, 51072026), Ph.D. Programs Foundation of the Ministry of Education of China (20102216110002, 20112216120003), the Science and Technology Development Planning Project of Jilin Province (Grant Nos. 20070402, 20060504), 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. Electrospinning preparation of LaOBr:Tb3+ nanostructures and their photoluminescence properties. J Mater Sci 48, 2557–2565 (2013). https://doi.org/10.1007/s10853-012-7046-2
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DOI: https://doi.org/10.1007/s10853-012-7046-2