纳米Y_2O_2S∶Eu的燃烧法合成和Eu^(3+)离子荧光探针物相分析

Synthesis of nano Y_2O_2S∶Eu phosphor by combustion method and crystal determining by Eu^(3+) ion fluorescence probe

将硝酸钇铕和较便宜的水溶性含硫燃烧剂溶于乙醇-水溶液,通过新的乙醇辅助燃烧法合成了一次粒径约20nm的硫氧化钇(Y2O2S∶Eu)发光材料。研究结果表明:采用硫代乙酰胺作为燃烧剂时,燃烧反应产物为Y2O2S∶Eu及微量的Y2O3∶Eu。而采用硫脲作为燃烧剂,燃烧反应产物为Y2O3∶Eu,Y2O2S∶Eu和/或Y2O2SO4∶Eu的混合物。利用Eu3+离子的5D0→7Fj跃迁导致的红色发光作为荧光探针,根据其在Y2O3(eλm=610nm),Y2O2S(eλm1=625nm,eλm2=615nm),Y2O2SO4(eλm1=613,eλm2=615nm)基质中的光致发光光谱和X射线发光光谱位置和强度不同,来确定生成物中Y2O3∶Eu,Y2O2S∶Eu,Y2O2SO4∶Eu物相的组成。

Y2O2S ： Eu nano crystallines with primary particle size about 20nm were prepared by a modified ethanol-assisted combustion synthesis method using yttrium/europium nitrate and inexpensive sulfur-containing organic fuel in ethanol-aqueous solution. It is shown that single Y2O2S ： Eu nano crystallines are obtained using thioacetamide as organic fuel,and a mixture of Y2O3 ： Eu,Y2O2S ： Eu and/or Y2O2SO4 ： Eu are acquired using thiourea as fuel. The spectrum profile in red emission region of Eu^3＋ due to the ^5 D0→7 Fi transition is adopted as a spectroscopic probe to detect the phase of Y2O3 （λem = 610nm）, Y2O2S （λem1= 625nm,λem2= 615nm）, and Y2O2SO4 （λem=613 and 615nm） in the as-received samples according their peak positions and relative intensities of photoluminescence and X ray luminescence emission spectra.