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Green, yellow, and orange defect emission from ZnO nanostructures: Influence of excitation wavelength

Aleksandra B. DjurišićThe University of Hong Kong Department of Physics, , Pokfulam Road, Hong KongY. H. LeungThe University of Hong Kong Department of Physics, , Pokfulam Road, Hong KongK. H. TamThe University of Hong Kong Department of Physics, , Pokfulam Road, Hong KongLu DingThe Hong Kong University of Science and Technology Department of Physics, , Clear Water Bay, Hong KongWeikun GeThe Hong Kong University of Science and Technology Department of Physics, , Clear Water Bay, Hong KongH. Y. ChenNational Tsing Hua University Department of Physics, , 101, Sec. 2, Huang-Fu Road, Hsinchu 300, TaiwanShangjr GwoNational Tsing Hua University Department of Physics, , 101, Sec. 2, Huang-Fu Road, Hsinchu 300, Taiwan

2006en

ABI

Annotatsiya

ZnO commonly exhibits luminescence in the visible spectral range due to different intrinsic defects. In order to study defect emissions, photoluminescence from ZnO nanostructures prepared by different methods (needles, rods, shells) was measured as a function of excitation wavelength and temperature. Under excitation at 325nm, needles exhibited orange-red defect emission, rods exhibited yellow defect emission, while shells exhibited green defect emission. Obvious color change from orange to green was observed for needles with increasing excitation wavelengths, while nanorods (yellow) showed smaller wavelength shift and shells (green) showed no significant spectral shift. Reasons for different wavelength dependences are discussed.

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Identifikatorlar

DOI: 10.1063/1.2182096

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