纳米(Y_(0.95)Eu_(0.05))_2O_3及其SiO_2气凝胶介孔组装体的制备与光致发光

Preparation and Photoluminescence of n-(Y_(0.95)Eu_(0.05))_2O_3 andn-(Y_(0.95)Eu_(0.05))_2O_3 Particles/SiO_2 Aerogel Assemblies

采用尿素溶胶法合成(Y0.95Eu0.05)2O3纳米粉，用超临界干燥技术制备了n-(Y0.95Eu0.05)2O3/SiO2气凝胶介孔组装体。结果表明，当Y3+∶Eu3+=20∶1,均相反应时间为4 h，且经680℃、 4 h灼烧热处理后得到的n-(Y0.95Eu0.05)2O3中， 光致发光强度最大（发光峰位于612 nm)，以Si与 2Y摩尔比为1∶7的n-(Y0.95Eu0.05)2O3/SiO2气凝胶介孔组装体，经同样条件热处理后，光致发光强度达不到n-(Y0.95Eu0.05)2O3的红光发射强度，而且峰位出现红移（发光峰在616 nm）。对产生上述发光强度减弱和峰位红移现象进行讨论。

Nanostructured (Y0.95Eu0.05)2O3 was synthesized through urea sol method, and n-(Y0.95Eu0.05)2O3 Particles/SiO2 aerogel assemblies were prepared by supercritical drying technique. The experimental results showed that we could achieve the maximum luminescence intensity by carefully choosing our optimal experimental conditions. When the molar ratio of Y3+ to Eu3+ equals 20∶1, homogenous reaction for 4h, then under 680℃， 4h annealing, the luminescence intensity of n-(Y0.95Eu0.05)2O3 was the maximum. In n-(Y0.95Eu0.05)2O3/SiO2 aerogel assemblies, annealing under the same conditions, when the molar ratio of Si to 2Y equals 1∶7, the luminescence intensity of the assembly is the strongest, but it was still weaker than the luminescence intensity of n-(Y0.95Eu0.05)2O3. And the phenomena of the luminescence intensity decrement of the assemblies against the nano-bulks and the red shift of the luminescence peaks were discussed.