| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Localized Surface Plasmons Enhanced Ultraviolet Emission of ZnO Films |
| LIU Yan-Song, LU Hai-Fei, XU Xiao-Liang**, GONG Mao-Gang, LIU Ling, YANG Zhou
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Department of Physics, University of Science and Technology of China, Hefei 230026
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LIU Yan-Song, LU Hai-Fei, XU Xiao-Liang et al 2011 Chin. Phys. Lett. 28 057803 |
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Abstract ZnO and ZnO/Ag films are grown on Si (111) substrates by rf magnetron sputtering at room temperature. After annealing, it is found that the ultraviolet (UV) emission of ZnO/Ag films strongly depends on the thickness of the initial internal Ag layer. During the annealing process, Ag nanoparticles are formed and diffused into the ZnO film. The resonant coupling between localized surface plasmons (LSPs) of Ag nanoparticles and ZnO enhances the UV emission. The largest UV enhancement over 12 times is found when the initial internal Ag layer is 10 nm. It is also observed that the diffusion of Ag nanoparticles destroys the ZnO crystal quality in different grades, depending on the sizes of the Ag nanoparticles. The poor crystal quality induces bad UV emission. It is concluded that the UV emission is the result of the competition between the LSP enhancement and the thermal diffusion destroying effect from Ag nanoparticles.
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| Keywords:
78.55.Et
78.66.Bz
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Received: 01 December 2010
Published: 26 April 2011
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