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BaFCl:Eu是一种优良的X射线发光材料,最近我们发现:虽然它的发光起源于Eu~(2+)离子的4f~65d→4f~7能级间的电子跃迁;但是晶体中同时存在的Eu~(3+)离子的电荷转移跃迁对发光有很明显的增强作用。因此在研究Eu~(2+)和Eu~(3+)离子在发光过程中的作用时,必须首先要知道它们在发光材料中的浓度。我们提出了一种准确测定BaFCl:Eu中Eu~(2+)和Eu~(3+)离子含量的方法。这种方法是依据Eu~(2+)离子的电子自旋共振(ESR)波谱以及Eu~(2+)和Eu~(3+)离子的发光光谱。我们合成了一系列含有不同Eu~(2+)/Eu~(3+)浓度比的BaFCl:Eu,并初步讨论了它们的发光现象。
BaFCl: Eu is an excellent X-ray luminescent material. Recently, we found that although its luminescence originated from the electronic transition between the 4f ~ 65d → 4f ~ 7 energy levels of Eu ~ (2+) ions, The charge transfer transitions of Eu ~ (3+) ion have a significant enhancement on the luminescence. Therefore, when studying Eu 2+ and Eu 3+ ions in the luminescence process, we must first know their concentration in the luminescent material. We propose a method for the accurate determination of Eu 2+ and Eu 3+ ions in BaFCl: Eu. This method is based on the electron spin resonance (ESR) spectra of Eu 2+ ions and the emission spectra of Eu 2+ and Eu 3+ ions. We synthesized a series of BaFCl: Eu with different Eu ~ (2 +) / Eu ~ (3+) concentration ratios and discussed their luminescence.