A new route to fabricate LaOI:Yb3+/Er3+ nanostructures via inheriting the morphologies of the precursors

作者：Wu Shang^*; Yu Wensheng; Dong Xiangting; Wang Jinxian; Liu Guixia

来源：CrystEngComm, 2014, 16(44): 10292-10299.

DOI：10.1039/c4ce01192a

LaOI:Yb3+/Er3+ nanostructures, including nanofibers and nanobelts, were successfully synthesized by electrospinning combined with a double-crucible iodination method using NH4I as the iodine source. X-ray diffraction (XRD) analysis reveals that LaOI:Yb3+/Er3+ nanostructures are tetragonal in structure with a space group of P4/nmm. Scanning electron microscopy (SEM) analysis shows that the diameter of LaOI:Yb3+/Er3+ nanofibers and the width and thickness of LaOI:Yb3+/Er3+ nanobelts are 147.48 +/- 17.50 nm, 1.95 +/- 0.20 mu m and 350 nm, respectively, under the 95% confidence level. Up-conversion (UC) emission spectroscopy analysis shows that LaOI:Yb3+/Er3+ nanostructures emit strong green and red up-conversion emission centered at 523 nm, 540 nm and 667 nm under the excitation of a 980 nm diode laser (DL), which are attributed to H-2(11/2) -> I-4(15/2), S-4(3/2) -> I-4(15/2) and F-4(9/2) -> I-4(15/2) energy level transitions of Er3+, respectively. It is found that the relative intensities of green and red emission vary obviously by changing the molar concentration of Er3+ ions, and the optimum molar ratio of Yb3+ to Er3+ is 10 : 5 in the as-prepared LaOI:Yb3+/Er3+ nanofibers. The possible formation mechanisms of LaOI:Yb3+/Er3+ nanofibers and nanobelts are also proposed.

• 出版日期2014
• 单位长春理工大学