Preparation And Luminescent Propetries Of Rare Earths Doped One-dimensional Silica Nanorods

Due to the special electron4f shell structure, the rare earth ions dopedluminescence materials have been provide further studying on the potentialapplications. Silica materials were selected as the matrix because of their a seriesoptical, electrical and mechanical properties, it was selected as the matrix. Meanwhile,we choose europium ions as activated dose of silica materials in our paper. In thispaper with TEOS as precursor, rare earth Eu3+single-doped and Eu3+-Gd3+co-dopedsilica nanorods luminescence materials were prepared by sol-gel method. At first,the optimal synthesis conditions of SiO2nanorods were studied, and theirluminescence mechanism were also analyzed. It was very useful to make cheaper andmore practical luminescent materials. The results of the research work are as follows:(1)The preparation and characterization of Eu3+ions doped the silica nanorods.The pH and aging temperature of the reaction had a significant effects on silicananorods doped with europium ions. From the XRD patterns, there was a broad peakin the2θ angle ranging from15oto35ofor samples, which indicated that the obtainedsilica were amorphous. By the SEM and TEM, we could see the nanorods wereuniform. Under392nm excitation, the luminescence of Eu3+-doped silica nanorodsshowed a strong red emission. Furthermore, the quenching concentration of europiumwas10mol%.(2)The preparation and characterization of Eu3+and Gd3+ions co-doped the silicananorods.Excitation spectra and emission spectrum of SiO2:Eu3+,Gd3+samples had beenstudied by changing Eu3+concentration with fixed Gd3+concentration. The energytransfer process from Gd3+ion to Eu3+ion had been studied. The mechanism ofenergy transfer from Gd3+to Eu3+was a resonant transfer, in which electric dipole-dipole interaction played a leading role. The optimal doping composition wasSiO2:10%Eu3+,9%Gd3+. The SEM and TEM results showed no apparent influence onmorphology after doping Gd3+. Furthermore, there was no obvious change of the absorption peak between doped and co-doped samples and the main structure had notbeen damaged with rare earths doping in materials.