Salas P, Nava N, Angeles-Chavez C, De la Rosa E, Díaz-Torres L A
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, A. P 1-1010, Querétaro, Qro. 76000, México.
J Nanosci Nanotechnol. 2008 Dec;8(12):6431-6.
ZrO2:Eu3+ nanocrystals were prepared by the sol-gel technique. The structural and luminescence properties of europium doped zirconia with 0.5 to 2 mol% were studied by Mössbauer spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM) and photoluminescence (PL) under UV excitation. Structural characterization shows a crystallite size between 16 to 55 nm and monoclinic and tetragonal zirconia phases as the main crystalline structure. XRD patterns shown that the content of the active ions stabilizes the tetragonal structure of ZrO2 at 1000 degrees C, being 100% for 2 mol% Eu2O3 doped sample. Such results are in agreement with HRTEM and Raman spectroscopy. The Mössbauer spectra of the ZrO2:Eu3+ samples show a single peak near zero velocity which is attributed to Eu+3. Luminescence characterization shows the typical emission band centered at 595 and 611 nm. Change in the structure of such band was observed and explained in terms of crystalline phase change. The dependence between the fluorescence emission and the crystalline structure is discussed.
采用溶胶 - 凝胶技术制备了ZrO2:Eu3+纳米晶体。通过穆斯堡尔光谱、拉曼光谱、X射线衍射（XRD）、高分辨率透射电子显微镜（HRTEM）以及紫外激发下的光致发光（PL）对掺杂0.5至2 mol%铕的氧化锆的结构和发光性能进行了研究。结构表征显示微晶尺寸在16至55 nm之间，主要晶体结构为单斜相和四方相氧化锆。XRD图谱表明，活性离子的含量在1000℃时稳定了ZrO2的四方结构，对于掺杂2 mol% Eu2O3的样品，该结构占比为100%。这些结果与HRTEM和拉曼光谱一致。ZrO2:Eu3+样品的穆斯堡尔光谱在零速度附近显示出一个单峰，这归因于Eu+3。发光表征显示典型发射带中心位于595和611 nm处。观察到了该发射带结构的变化，并根据晶相变化进行了解释。讨论了荧光发射与晶体结构之间的依赖性。
