Enhanced photoluminescence of Zn O ∕ Er 2 O 3 core-shell structure nanorods synthesized by pulsed laser deposition

A narrow size distribution of ZnO nanorod array has been synthesized on silicon substrate by pulsed laser deposition (PLD) in argon ambient. Zn O ∕ Er 2 O 3 core-shell nanostructures were then formed through PLD of a thin Er 2 O 3 layer onto the fabricated ZnO nanorod surface. Transmission electron...

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Published inApplied physics letters Vol. 90; no. 26; pp. 263106 - 263106-3
Main Authors Li, S. Z., Gan, C. L., Cai, H., Yuan, C. L., Guo, J., Lee, P. S., Ma, J.
Format Journal Article
Published American Institute of Physics 26.06.2007
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ISSN0003-6951
1077-3118
DOI10.1063/1.2752020

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Summary:A narrow size distribution of ZnO nanorod array has been synthesized on silicon substrate by pulsed laser deposition (PLD) in argon ambient. Zn O ∕ Er 2 O 3 core-shell nanostructures were then formed through PLD of a thin Er 2 O 3 layer onto the fabricated ZnO nanorod surface. Transmission electron microscopy analysis shows that both the ZnO core and Er 2 O 3 shell are polycrystalline. Photoluminescence measurement was carried out to characterize the optical properties of the core-shell nanostructures. The band diagram of the core-shell structure shows that a type-II nanostructure may have formed, which explains the ultraviolet emission enhancement of the core-shell structure over pure ZnO nanorods.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2752020