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Preparation and up‐conversion luminescence properties of LaOBr:Yb 3+ /Er 3+ nanofibers via electrospinning
Author(s) -
Ma Wenwen,
Yu Wensheng,
Dong Xiangting,
Wang Jinxian,
Liu Guixia
Publication year - 2014
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2640
Subject(s) - nanofiber , luminescence , materials science , scanning electron microscope , electrospinning , tetragonal crystal system , analytical chemistry (journal) , spectroscopy , nuclear chemistry , nanotechnology , crystallography , crystal structure , optoelectronics , chemistry , composite material , physics , chromatography , quantum mechanics , polymer
LaOBr:Yb 3+ /Er 3+ nanofibers were synthesized for the first time by calcinating electrospun PVP/[La(NO 3 ) 3 + Er(NO 3 ) 3 + Yb(NO 3 ) 3 + NH 4 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 H 11/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 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. Copyright © 2014 John Wiley & Sons, Ltd.