燃烧法合成Sr_2Al_3O_6:Eu^(2+),Dy^(3+)发光材料的物相组成研究  

Phase Compositions of Phosphors Sr_3Al_2O_6:Eu^(2+),Dy^(3+) Synthesized by Combustion Synthesis Method

作　　者：孙文周[1] 陈宇红[1] 

机构地区：[1]北方民族大学材料科学与工程学院,宁夏银川750021

出　　处：《中国稀土学报》2016年第5期538-543,共6页Journal of the Chinese Society of Rare Earths

基　　金：宁夏高等学校科学技术研究项目(NGY2013091)资助

摘　　要：提出采用燃烧法合成Sr_3Al_2O_6:Eu^(2+),Dy^(3+)红色长余辉发光材料,旨在通过工艺优化合成出单相的铝酸锶基质,为制备发光性能良好的红色发光材料打下基础。通过对样品进行XRD衍射分析,分别探讨了燃烧温度、尿素添加量以及二次还原工序的引入对样品的物相组成的影响。结果表明:仅调节燃烧温度和尿素添加量不能得到单相Sr_3Al_2O_6基质,产物中往往存在SrAl_2O_4,Sr_4Al_2O_7等杂质相,然而当尿素添加量增加时,虽导致产生大量SrCO_3,但同时也抑制了很难排除的杂质相SrAl_2O_4,Sr_4Al_2O_7的生成。如将该样品在1200℃下还原煅烧则可使SrCO_3分解继而反应生成目标产物Sr_3Al_2O_6,由此获得接近纯相的Sr_3Al_2O_6基质。最终确定较优化的工艺条件为:燃烧温度为850℃,尿素添加量为硝酸盐的2倍,燃烧后在1200℃下进行二次还原煅烧。Strontium aluminate long persistence phosphors were synthesized by combustion method. The initiating temperature, the amounts of urea and the reduction process on phase composition were studied by XRD phase analyses of the samples. The results showed that the singe phase Sr3 Al2O6 could not be obtained by controlling the initiating temperature and the additive amount of urea. SrCO3 generated when increase the amount of urea but then it decomposed in the subsequent reduction process at 1200 ℃, so that the formation of impurity phase SrAAl2O4, SraAl2O7 were inhibited. Singe phase Sr3Al2O6 was obtained. Base on above results, the optimum conditions were determined： the initiating temperature was 850 ℃, the mole ratio of urea and metal nitrates was 2 and product of combustion was reduced at 1200 ℃.

关 键 词：长余辉发光材料 燃烧合成法 Sr3Al2O6:Eu^2+ Dy^3+ 物相组成 

分 类 号：TG146.4[一般工业技术—材料科学与工程]