title: Growth mechanism and ultraviolet-light emission of the self-assembled complex of MgO nanostructures.
abstract: Bulk-quantity net-like nanodendrites and four-fold hierarchical nanostructures were synthesized by direct thermal evaporation and oxidation of metallic Mg powder. Their formation mechanism is explained using the self-catalytic vapor-liquid-solid mechanism together with dendritic-crystal epitaxial growth mechanism. Four-branch and eight-branch nanodendrites were also detected. The photoluminescence spectrum reveals that the peak with the maximum intensity is centered at about 3.16 eV (392 nm). Through Gaussian fitting, a strong and narrow ultraviolet-light emission peak centered at 3.16 eV (392 nm) and a relatively weak but broad blue-light emission band centered at 2.74 eV (453 nm) were observed in the photoluminescence emission spectrum, which are respectively attributed to the recombination luminescence of the F+ and F centers (belonging to oxygen-vacancy related defect levels) in the MgO nanostructures. In addition, another very weak and broad red-infrared emission band can also be detected, which is probably due to the relaxation luminescence of impurity levels in the MgO nanostructures.
authors: School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, People's Republic of China.
authors: J
authors: J
authors: Jiang
authors: Y Q
authors: YQ
authors: Chen
authors: Z Y
authors: ZY
authors: He
authors: Y
authors: Y
authors: Su
authors: R L
authors: RL
authors: Zhou
authors: L
authors: L
authors: Chen
authors: D
authors: D
authors: Cai
mesh_terms: D003460:Crystallization / Q000379:methods*; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D008277:Magnesium Oxide / Q000737:chemistry* / Q000528:radiation effects*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D010316:Particle Size; D010777:Photochemistry / Q000379:methods*; D013057:Spectrum Analysis; D014466:Ultraviolet Rays
chemical_list: D008277:Magnesium Oxide