Wang Xi-gui, Qi Xia, Bo Su-ling, Na Mi-la
Chemistry and Environment Science College, Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Huhhot 010022, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 May;31(5):1193-6.
In the present paper, the samples of nanomaterials TiO2-SiO2:Eu3+ with different proportion of Ti/Si were prepared with the sol-gel method, and influence of the proportion of Ti/Si on the luminescence properties of samples have was studied. The structure of the samples was examined by FTIR, indicating that the compound TiO2 and SiO2 reacted, forming the new chemical bond of Ti-O-Si. The TEM of samples show that TiO2-SiO2:Eu3+ are sphericity nanoparticles with monodispersion and uniform size of 35 nm. The samples were still anatase phase after annealing at 900 degrees C, which was studied by XRD and SAED, suggesting that the bond of Ti-O-Si was conducive to the stability of anatase phase. There will be isoelectronic trap as Si4+ enters the TiO2 lattice replacing some of the Ti4+ position, and this structure is conducive to transfering energy and improving the transition of Eu3+ (7F0 --> 5D2), which were found by excitation and emission spectra.
在本论文中，采用溶胶-凝胶法制备了不同Ti/Si比例的纳米材料TiO2-SiO2:Eu3+，并研究了Ti/Si比例对样品发光性能的影响。通过傅里叶变换红外光谱（FTIR）对样品结构进行了检测，结果表明TiO2和SiO2发生了反应，形成了Ti-O-Si新化学键。样品的透射电子显微镜（TEM）显示，TiO2-SiO2:Eu3+是球形纳米颗粒，具有单分散性且尺寸均匀，为35 nm。通过X射线衍射（XRD）和选区电子衍射（SAED）研究发现，样品在900℃退火后仍为锐钛矿相，这表明Ti-O-Si键有利于锐钛矿相的稳定性。当Si4+进入TiO2晶格取代部分Ti4+位置时会形成等电子陷阱，通过激发光谱和发射光谱发现，这种结构有利于能量转移并改善Eu3+（7F0→5D2）的跃迁。
