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A Technique to Fabricate La 2 O 2 CN 2 :Tb 3+ Nanofibers and Nanoribbons with the Same Morphologies as the Precursors
Author(s) -
Guo Xiaomin,
Yu Wensheng,
Dong Xiangting,
Wang Jinxian,
Ma Qianli,
Liu Guixia,
Yang Ming
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402860
Subject(s) - terbium , photoluminescence , nanofiber , luminescence , chemistry , doping , tetragonal crystal system , nanotechnology , analytical chemistry (journal) , crystallography , crystal structure , materials science , optoelectronics , chromatography
Abstract Terbium(III)‐doped lanthanum dioxymonocyanamide (La 2 O 2 CN 2 :Tb 3+ ) nanofibers and nanoribbons were fabricated, by the cyanamidation technique, from precursor La 2 O 3 :Tb 3+ nanofibers and nanoribbons prepared by electrospinning. The morphology of the final products were the same as those of the precursors. X‐ray powder diffraction analysis indicated that the crystal phase of La 2 O 2 CN 2 :Tb 3+ is tetragonal in space group I 4/ mmm . SEM analysis revealed that the thickness and width of the La 2 O 2 CN 2 :Tb 3+ nanoribbons is about 184 nm and 3.53 ± 0.37 μm, respectively, and the diameter of the La 2 O 2 CN 2 :Tb 3+ nanofibers is 175.87 ± 16.23 nm at a 95 % confidence level. When excited with a 274 nm ultraviolet light source, the La 2 O 2 CN 2 :Tb 3+ nanostructures emit predominantly at 543 nm; this emission originates from the 5 D 4 → 7 F 5 energy level transition of the Tb 3+ ion. It was found that the optimum molar concentration of Tb 3+ ions for doping La 2 O 2 CN 2 :Tb 3+ nanostructures is 3 %. The La 2 O 2 CN 2 :Tb 3+ nanofibers exhibit a higher photoluminescence (PL) intensity than that exhibited by nanoribbons for the same doping concentration. Commission International de l'Eclairage (CIE) analysis demonstrated that color‐tuned luminescence can be obtained by changing the concentration of the doping activator ions and the nanostructure morphology. Possible formation mechanisms for the La 2 O 2 CN 2 :Tb 3+ nanofibers and nanoribbons are also proposed. More importantly, the new technique employed in this paper and the preparation method are of universal significance for providing other rare earth oxycyanamide nanostructures with various morphologies.