碱金属—镓族复合氟化物中 Eu^(2+)发射中心形成的过程

Process of Forming Emission Centre of Eu^(2+) Ion in Alkali Metal-Gallium Family Complex Fluorides

本文分别以 KAlF_4:Eu^(2+)和 RbGaF_4:Eu^(2+)为例,讨论了碱金属—镓族复合氟化物中 Eu^(2+)发射中心形成的过程。合成了掺 Eu^(2+)的 AMF_4(A=Na,K,Rb,Cs,M=B,Al,Ga)及 AI_(n2)F_7(A=K,Rb)。Eu^(2+)占据 AMF_4中 A^+格位。AMF_4:Eu^(2+)和 AI_nF_7:Eu^(2+)中,Eu^(2+)发射是锐峰,来源于 f→f 跃迁。Eu^(2+)进入取代格位形成发射中心的过程与中间产物(A_4MF_(?))和激活剂(EuF_2)分解条件有关。由于4f 电子受到良好屏蔽,Eu^(2+)的 f→f 发射峰位置不变。

The process of forming emission centre of Eu^(2+) in alkli metal-gallium familycomplex fluorides was discussed in this paper.AMF_4(A=Na,K,Rb,Cs:M=B,Al,Ca and AIn_2F_7 A=K,Rb)doped with Eu^(2+) were synthesized.Eu^(2+) occupiesthe lattice site of A^+ in AMF_4:Eu^(2+) and its emission is a sharp peak which risesfrom f→f transition of Eu^(2+).The formation of emission centre of Eu^(2+)is related tothe decomposition condition of the intermediate (A_3MF_6) and the activator (EuF_2).The emission peak position of f→f transition of Eu^(2+) does not vary at about 360nm because 4f electron is well shielded.