Correlations between surface-excitonic emission bands in ZnO nanowires
Correlations between surface-excitonic emission bands in ZnO nanowires
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DOI：
10.1088/0957-4484/19/13/135705
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发表时间：
2008-04
期刊：
影响因子：
3.5
通讯作者：
L. Wischmeier;T. Voss;I. Rückmann;J. Gutowski
中科院分区：
文献类型：
--
作者：
L. Wischmeier;T. Voss;I. Rückmann;J. Gutowski
我们报告的两个不同的表面相关的光致发光带在氧化锌纳米线的相关光谱特性的调查。我们表明，光谱位置和温度依赖的强度的表面相关的发射带A的表面激子带SX的发射直接相关。我们测量了两个发射带的热激活能，并给出了时间分辨的光致发光数据，以推断A发射带的光致发光衰减时间。我们提出了一个模型来解释实验观察和分配的A发射带的激子绑定到结构缺陷的纳米线的表面层。
We report on the investigation of correlated spectral properties of two different surface-related photoluminescence bands in ZnO nanowires. We show that the spectral position and the temperature-dependent intensity of the surface-related emission band A are directly correlated with the emission of the surface-exciton band SX. We measure the thermal activation energies of both emission bands and present time-resolved photoluminescence data to deduce the photoluminescence decay time of the A emission band. We propose a model to explain the experimental observations and assign the A emission band to excitons bound to structural defects in the surface layer of the nanowires.