本文研究了用电子束分蒸技术制备的ZnO∶Er薄膜的结构和发光特性.X射线衍射(XRD)谱表明,六角晶体结构的ZnO∶Er薄膜具有强的择优c轴取向(002).在室温下,用阴极射线激发样品,观测到强的蓝光(455nm)发射.本文认为,蓝光发射是ZnO∶Er薄膜中铒离子(Er3+)的激发态4F5/2到基态4I15/2的辐射跃迁.研究薄膜的阴极射线发光强度与电子束流的关系时发现,蓝光发射强度强烈地依赖于电子束流的大小.此外,超过阈值电子束流0.6μA,蓝光发射强度首先迅速增加,然后缓慢地增加,趋于饱和,根据瓶颈效应和稀土发光理论很好地解释了这一实验结果.
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