本文采用共沉淀法合成了一系列不同Eu3+含量的Mg-Al-Eu三元层状复合金属氢氧化物(LDH).采用X-射线衍射(XRD)、红外光谱(IR)、光致发光光谱(PL)以及热重(TG-DTG)对产物进行表征,发现LDH中Eu3+/Al3+物质的量百分比小于25%时,三元LDH中Eu3+含量的增加对其结晶性没有明显的影响;当Eu3+/Al3+物质的量百分比达到25%时,其结晶质量明显变差.PL分析结果表明,所有样品中出现典型的Eu3+5DO-7FJ(J=1,2,3,4)跃迁所致的红光发射.随Eu3+含量的增加,Eu3+的发射强度明显呈增强趋势;当Eu3+/Al3+物质的量百分比达到25%时,其发射强度明显减弱.由此可知,Mg-Al-Eu LDH结构中,Eu3+/Al3+最佳物质的量百分比为20%.
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