Eu2+在多铝酸钠体系中的发光

应用高温固相法合成了Na的多铝酸盐，并研究了Eu^2＋在体系中的发光性能．结果表明，Na_1＋xMgAl_11－xO₁₇体系在整个组成范围内保持Na的β－Al₂O₃结构不变，而对于Na_1．67－2xBa_xAl1_0．33O₁₇体系，在x＝0．30附近体系结构发生转变，x＜0．30，体系形成Na的外β－Al2O3结构的固溶体，x＞0．30，体系形成Ba的β－Al₂O₃结构的有序体；与体系组成和结构的变化相对应，Eu^2＋的发射能量和发光强度产生相应的变化，在Na的β－Al₂O₃中Eu^2＋存在高、低能两种发射中心；通过系列化研究，获得了新的组成的、具有β－Al₂O₃结构的荧光体Na_0．67Ba_0．50Mg_0．67Al_10．33O₁₇：Eu^2＋，在较低的掺杂浓度（0．05mol）下可以产生较强的发光．

Luminescence of Eu2+ in Sodium Polyaluminates

The sodium polyaluminates were synthesized by a high temperature solid state method and the luminescence of Eu²⁺ in the sodium polyaluminates was studied. The results show that the structure of the system Na_1+xMg_xAl_11-xO₁₇ from x=0.1 to x=1.0 belongs to Na-beta-alumina and the structure of the system Na_1.67-2xBa_xMg_0.67Al_10.33O₁₇ changes at about x equal to 0.30, when x is smaller than 0.30 the system forms the solid solution structure of Na-beta-alumina, when x is larger than 0.30 the system becomes the ordered structure of Ba-beta-alumina, correspondingly the emission peak position and the relative emission intensity of Eu²⁺ change with the changes of composition and structure of the system. There exist two kinds of the luminescent centers of high and low energies of Eu²⁺ in the matrix of Na-beta-alumina structure. New phosphor with Ba-beta-alumina structure, Na_0.67Ba_0.50Mg_0.67Al_10.33O₁₇:Eu²⁺, was obtained.