title: Preparation and up-conversion luminescence properties of LaOBr:Yb3+/Er3+ nanofibers via electrospinning.
abstract: LaOBr:Yb(3+)/Er(3+) nanofibers were synthesized for the first time by calcinating electrospun PVP/[La(NO3)3 + Er(NO3)3 + Yb(NO3)3 + NH4 Br] composites. The morphology and properties of the final products were investigated in detail using scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray diffractometry (XRD) and fluorescence spectroscopy. The results indicate that LaOBr:Yb(3+)/Er(3+) nanofibers are tetragonal in structure with a space group of P4/nmm. The diameter of LaOBr:Yb(3+)/Er(3+) nanofibers is ~ 147 nm. Under the excitation of a 980-nm diode laser, LaOBr:Yb(3+)/Er(3+) nanofibers emit strong green and red up-conversion emission centering at 519, 541 and 667 nm, ascribed to the (2)H11/2, (4)S3/2 → (4) I(15/2) and (4)F9/2 → (4)I(15/2) energy-level transitions of Er(3+) ions, respectively. The up-conversion luminescent mechanism of LaOBr:Yb(3+)/Er(3+) nanofibers is advanced. Moreover, near-infrared emission of LaOBr:Yb(3+)/Er(3+) nanofibers is obtained under the excitation of a 532-nm laser. The formation mechanism of LaOBr:Yb(3+)/Er(3+) nanofibers is proposed. LaOBr:Yb(3+)/Er(3+) nanofibers could be important up-conversion luminescent materials.
authors: Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun, 130022, China.
authors: Wenwen
authors: W
authors: Ma
authors: Wensheng
authors: W
authors: Yu
authors: Xiangting
authors: X
authors: Dong
authors: Jinxian
authors: J
authors: Wang
authors: Guixia
authors: G
authors: Liu
mesh_terms: D001965:Bromides / Q000737:chemistry*; D055664:Electrochemical Techniques; D004871:Erbium / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry*; D049449:Luminescence; D057139:Nanofibers / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D015018:Ytterbium / Q000737:chemistry
chemical_list: D001965:Bromides; D007811:Lanthanum; D004871:Erbium; D015018:Ytterbium; D010100:Oxygen
keywords: LaOBr:Yb3+/Er3+; electrospinning; nanofiber; up-conversion luminescence