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科学通报  2012 

CaLaGa3O7:Dy3+荧光粉的光致和阴极射线发光性能

DOI: 10.1360/csb2012-57-2-3-189, PP. 189-193

Keywords: 荧光粉,阴极射线发光,光致发光,FEDs

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Abstract:

采用化学共沉淀法制备单一基质CaLaGa3O7Dy3+白色荧光粉,借助场发射扫描电子显微镜(fieldemissionscanningelectronmicroscopy,FE-SEM),X-射线衍射(X-raydiffraction,XRD),激光粒度仪,光致发光(photoluminescence,PL)和阴极射线发光(cathodoluminescence,CL)光谱对其结构和光学性能进行研究.结果表明,样品由一些黏结在一起的近球形颗粒组成,有轻微的团聚现象,平均粒径约为1.0μm.Dy3+离子作为发光中心取代CaLaGa3O7晶格中的La3+离子,其对称格位为Cs.在紫外光和低压电子束的激发下,CaLaGa3O7Dy3+荧光粉表现出Dy3+的特征发射(4F9/2-6H15/2跃迁和4F9/2-6H13/2跃迁),其最强发射峰为573nm(黄光).样品的色坐标均位于白光区域,并讨论了发光机理.此荧光粉可被应用于场发射显示器(fieldemissiondisplays,FEDs)和白光发光二极管(light-emittingdiodes,LED)中.

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