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本文考察了Eu~(2+)在BaF_2—2RF_3(R=La、Gd、Lu和Y)体系中的光谱结构。实验发现,室温下Eu~(2+)在BaF_2—2LaF_3与BaF_2—2GdF_3体系中只有宽带的f—d跃迁发射。而在BaF_2—2LuF_3和BaF_2—2YF_3体系中除了有宽带的f—d跃迁发射之外,在3600nm附近还有f—f跃迁的尖峰发射。认为这是由于晶场强度不同造成的。比较了Eu~(2+)在MF_2—LuF_3(M=Ca、Sr、Ba)体系中的光谱特性。指出,随着碱土金属离子半径增大,电负性变小,晶场强度则减弱。室温下只观察到Eu~(2+)在BaF_2—LuF_3体系中的尖峰结构。
In this paper, we investigate the spectral structure of Eu 2+ in BaF_2-2RF_3 (R = La, Gd, Lu and Y) systems. It is found that Eu 2+ only emits a broad-band f-d transition in BaF_2-2LaF_3 and BaF_2-2GdF_3 systems at room temperature. In addition to the broadband f-d transition emission in the BaF_2-2LuF_3 and BaF_2-2YF_3 systems, there is also a spike emission of f-f transition near 3600 nm. Think this is due to different crystal field caused. The spectral characteristics of Eu ~ (2+) in MF_2-LuF_3 (M = Ca, Sr, Ba) system were compared. It is pointed out that as the radius of alkaline earth metal ions increases, the electronegativity decreases and the strength of the crystal field decreases. Only the peak structure of Eu ~ (2+) in BaF_2-LuF_3 system was observed at room temperature.