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科学通报  2012 

四方相LiY(Yb)F4:Yb3+/Er3+晶体颗粒的合成及上转换荧光光谱

DOI: 10.1360/972012-237, PP. 2366-2370

Keywords: 稀土离子,上转换发光,EDTA,水热法

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Abstract:

采用水热法分别合成了四方相LiYF4Yb3+/Er3+和LiYbF4Yb3+/Er3+的八面体晶体颗粒,并通过XRD,SEM,荧光光谱观测等手段对其晶相、形貌及上转换荧光效应等进行了研究.结果表明,EDTA(乙二胺四乙酸)表面活性剂的引入导致了样品平均粒径和结晶度的变化及发光强度等的变化.在波长为980nm激光的激发下,观测到了源于2H11/2→4I15/2和4S3/2→4I15/2跃迁的绿色上转换荧光发射、4F9/2→4I15/2跃迁的红光发射和2H9/2→4I15/2跃迁所产生的微弱紫光发射;分析了上转换发光机理和基质变化对上转换荧光性质的影响.

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