Synthetic and effect of annealing on the luminescent properties of ZnO nanowire
| Autor: | Hui Yang, Zhaojun Mo, Zhi-Hong Hao, Qing Yang, Lan Li, Jianping Xu, Xiaosong Zhang, Hai-Zhen Wu, Ping Zhuo |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Annealing (metallurgy) Biophysics Analytical chemistry Nanowire chemistry.chemical_element 02 engineering and technology Crystal structure 010402 general chemistry medicine.disease_cause 01 natural sciences Biochemistry Oxygen medicine business.industry General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences chemistry Atomic electron transition Optoelectronics 0210 nano-technology business Luminescence Ultraviolet |
| Zdroj: | Journal of Luminescence. 175:232-236 |
| ISSN: | 0022-2313 |
| Popis: | 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 ~30 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 (545 nm) to yellow (580 nm) and blue-shifts from yellow (580 nm) to green (520 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 (520 nm) and blue-shifts (580) can match up the bimodal lorentzian fitting (520 nm and 583 nm) of as-growth, which suggest that the visible emission band (545 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 Zn i defects compound with holes of V Zn , O i and O Zn 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect