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Synthesis and White-Light Emission of ZnO/HfO2: Eu Nanocables

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Author(s): Liu Lixin | Zhang Hongliang | Wang Yuan | Su Yurong | Ma Ziwei | Xie Yizhu | Zhao Haiting | Chen Changcheng | Liu Yanxia | Guo Xiaosong | Su Qing | Xie Erqing

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 9;
Start page: 1418;
Date: 2010;
Original page

Keywords: ZnO | HfO2:Eu | Nanocables | White-light emission | Electrospinning

ABSTRACT
Abstract ZnO/HfO2:Eu nanocables were prepared by radio frequency sputtering with electrospun ZnO nanofibers as cores. The well-crystallized ZnO/HfO2:Eu nanocables showed a uniform intact core–shell structure, which consisted of a hexagonal ZnO core and a monoclinic HfO2 shell. The photoluminescence properties of the samples were characterized. A white-light band emission consisted of blue, green, and red emissions was observed in the nanocables. The blue and green emissions can be attributed to the zinc vacancy and oxygen vacancy defects in ZnO/HfO2:Eu nanocables, and the yellow–red emissions are derived from the inner 4f-shell transitions of corresponding Eu3+ ions in HfO2:Eu shells. Enhanced white-light emission was observed in the nanocables. The enhancement of the emission is ascribed to the structural changes after coaxial synthesis.
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