کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5398216 | 1505886 | 2016 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthetic and effect of annealing on the luminescent properties of ZnO nanowire
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
ZnO nanowires were successfully fabricated by using the hydrothermal method in the existence of the poly ethylene glycol (PEG) with the molecular weight of 200. The experimental results exhibit that the ZnO nanowires with the diameter of ~30Â nm and the length of ten micrometers. PL spectra show a weak ultraviolet emission and an intense broad visible emission band for as-grown and annealed samples. These visible emission bands exhibit red-shifts from green (545Â nm) to yellow (580Â nm) and blue-shifts from yellow (580Â nm) to green (520Â nm) by annealing at aerobic or anaerobic environment, it indicates that the defect types are changed by annealed at different environment. Additionally, the red-shifts (520Â nm) and blue-shifts (580) can match up the bimodal lorentzian fitting (520Â nm and 583Â nm) of as-growth, which suggest that the visible emission band (545Â nm) is closely related to oxygen defects. The oxygen atomic can enter into the crystal lattice of ZnO and decrease the oxygen vacancy in air or oxygen, whereas, more oxygen vacancy defects is gave rise in vacuum annealed. We guess the energy levels of the intrinsic defects in ZnO nanowire maybe like that: the electrons of Zni defects compound with holes of VZn, Oi and OZn levels and conform to the yellow emission, and the green emission corresponds to the electron transition from the association defects deep donor level to the valence band.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 175, July 2016, Pages 232-236
Journal: Journal of Luminescence - Volume 175, July 2016, Pages 232-236
نویسندگان
Zhao-Jun Mo, Zhi-Hong Hao, Hai-Zhen Wu, Qing Yang, Ping Zhuo, Hui Yang, Jian-Ping Xu, Xiao-Song Zhang, Lan Li,