Liu Hai, Yu Lixin
Department of Materials Science and Engineering, Nanchang University, 330031 Nanchang, PR China.
J Nanosci Nanotechnol. 2013 Jul;13(7):5119-25. doi: 10.1166/jnn.2013.7600.
In this paper, pure and Eu3+ doped TiO2 nanocrystals (NCs) have been fabricated successfully by a two steps of sol-gel and hydrothermal methods. The microstructures, morphologies and photoluminescent properties of Eu(3+)-TiO2 were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and photoluminescence spectroscopy (PL). XRD and PL results show that the existent of rare earth can inhibit the transformation of TiO2 NCs from anatase to rutile phase and can improve the luminescence intensity of the prepared samples. The room-temperature PL emission of the as-grown samples is dominated by the 5D(0)-7F(j) transitions of Eu3+ ions. But the luminescence intensity drops dramatically when the annealing temperature reaches a relatively high degree because of the formation of the rutile phase of TiO2 NCs hosts.
在本文中，通过两步溶胶-凝胶法和水热法成功制备了纯的和Eu3+掺杂的TiO2纳米晶体（NCs）。采用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）和光致发光光谱（PL）对Eu(3+)-TiO2的微观结构、形貌和光致发光性能进行了研究。XRD和PL结果表明，稀土的存在可以抑制TiO2 NCs从锐钛矿相向金红石相的转变，并能提高所制备样品的发光强度。生长态样品的室温PL发射主要由Eu3+离子的5D(0)-7F(j)跃迁主导。但当退火温度达到较高程度时，由于TiO2 NCs主体形成金红石相，发光强度急剧下降。
