【摘要】 于不同气流中,合成了MMgF₄:xEU,yTb复合氟化物燐光体.该体系中Eu³⁺和Eu²⁺共存.Tb的存在影响Eu的价态存在形式.ESR测试表明,随Tb的掺入浓度增加,Eu²⁺的浓度呈规律性变化.随Eu的掺入,样品的XPS谱中出现了四价铽的Tb₃d（5/2）特征伴峰.认为Eu³⁺和Tb³⁺之间存在电荷迁移平衡.即Eu³⁺+Tb³⁺（?）Eu²⁺+Tb⁴⁺.通过半定量手段研究了SrMgF₄中这一平衡的平衡常数.更多还原

【Abstract】 Emission of europium (II)and europium (III) have been observed in SrMgF4:xEu, yTb phosphors which are synthesized in Ar or Ar/H2 flow. The valence state of Eu is influenced by terbium. It is notable that the intensities of the ESR peaks corresponding to Eu2+ are regularly changed when terbium ion is incorporated. The typical Tb3d XPS spectrum belonging to Tb4+ is also found when Eu is codoped. This phenomena can be explained by electron transfer mechanismEu3+ + Tb3+→Eu2 + + Tb4+ .And its equilibrium constant is studied by ESR technique.更多还原