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采用水热法分别合成了四方相LiYF4:Yb3+/Er3+和LiYbF4:Yb3+/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.
The octahedral crystals of tetragonal LiYF4: Yb3 + / Er3 + and LiYbF4: Yb3 + / Er3 + were synthesized by hydrothermal method. Their crystal phases, morphologies and up-conversion fluorescence effects were investigated by XRD, SEM and fluorescence spectroscopy The results showed that the introduction of EDTA (ethylenediaminetetraacetic acid) surfactant led to changes in the average particle diameter and crystallinity of the sample and the change of luminescence intensity etc. Under the excitation of a laser with a wavelength of 980 nm, the source The green upconversion fluorescence emission at 2H11 / 2 → 4I15 / 2 and 4S3 / 2 → 4I15 / 2 transitions, the red emission at 4F9 / 2 → 4I15 / 2 transitions and the weak purple light resulting from the 2H9 / 2 → 4I15 / 2 transition The effects of up-conversion luminescence mechanism and matrix changes on the up-conversion fluorescence properties were analyzed.