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White Light Emission of ZnO-Cu Nano-Films

机译：ZnO-Cu纳米薄膜的白光发射

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The ZnO films were prepared by reactive rf-magnetron sputtering on silicon and sapphire substrates. For Cu-doping of the ZnO films, the close space sublimation method (CSS) was used at atmospheric pressure in air. After CSS processing, the ZnO and ZnO-Cu films were annealed in a wet media. The reference ZnO-Cu films, obtained from ZnO-Cu target by electron-beam evaporation (EBE) were treated at the same conditions. The microstructure and optical properties of the samples were compared and studied by atomic force microscopy (AFM), X-ray diffraction (XRD), photoluminescence (PL) and cathodoluminescence (CL) spectra. XRD results indicated that all the ZnO films have a polycrystalline hexagonal structure. The surface and crystal quality of ZnO thin film was improved when doped with Cu. The shape of the spectrum depends on the method of doping. Spectrum of the reference ZnO-Cu films has green band only. Spectrum of ZnO-Cu films consists of three emission bands at doping by CSS. The first band is in a blue region with a maximum at 465 nm. The second and third bands are in the green and orange regions with maximum at 520 and 580-600 nm, respectively. The green band is the most intensive. As a consequence, the emission looks like white light. Origin of observed emission bands is discussed.
机译：ZnO薄膜是通过在硅和蓝宝石衬底上进行反应性射频磁控溅射制备的。为了对ZnO薄膜进行Cu掺杂，在大气中的大气压力下采用了近距离升华方法（CSS）。 CSS处理后，将ZnO和ZnO-Cu膜在湿介质中退火。在相同条件下处理通过电子束蒸发（EBE）从ZnO-Cu靶获得的参考ZnO-Cu膜。通过原子力显微镜（AFM），X射线衍射（XRD），光致发光（PL）和阴极发光（CL）光谱对样品的微观结构和光学性质进行了比较和研究。 XRD结果表明，所有ZnO薄膜均具有多晶六边形结构。掺杂Cu可以改善ZnO薄膜的表面和晶体质量。光谱的形状取决于掺杂方法。参考ZnO-Cu膜的光谱仅具有绿带。 ZnO-Cu薄膜的光谱由CSS掺杂时的三个发射带组成。第一个带处于蓝色区域，最大波长为465 nm。第二和第三条带分别位于绿色和橙色区域，最大值分别在520和580-600 nm。绿带最密集。结果，发射看起来像白光。讨论了观察到的发射带的起源。

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