材料科学
X射线光电子能谱
光致发光
发光
锐钛矿
分析化学(期刊)
钇
带隙
光子上转换
二氧化钛
拉曼光谱
光谱学
兴奋剂
镱
透射电子显微镜
金红石
光催化
氧化物
纳米技术
光电子学
光学
化学工程
化学
工程类
物理
催化作用
冶金
量子力学
生物化学
色谱法
作者
Eder Reséndiz López,M. Morales-Luna,Martha Letícia Gaeta González,R. Aruna-Devi,F. de Moure-Flores,S.A. Mayén-Hernández,J. Santos‐Cruz
摘要
Yttrium oxide nanostructures doped with erbium and ytterbium ions were incorporated into a titanium dioxide (TiO2) host by a hydrothermal method to modify the bandgap of TiO2. The samples were prepared with different concentrations of nanophosphors (Y2O3: Er3+-Yb3+). Then, the samples were characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), x-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy. The XRD analysis revealed the mixture of anatase and rutile crystal structures for all the samples. The TEM measurements showed agglomerated particles with a spherical shape of around 50 nm. TiO2 doped with a high concentration of Y2O3:Er3+-Yb3+ exhibited a strong visible upconversion luminescence under the excitation of 980 nm (infrared laser) as compared to other samples. Photoluminescence studies revealed the green (522 nm), yellow (563 nm), and red emissions (661 nm) corresponding to 2H11/2 → 4I15/2, 4S3/2 → 4I15/2, and 4F9/2 → 4I15/2 transitions of Er3+ in Y2O3:Er3+-Yb3+@TiO2 nanophosphors, respectively. Furthermore, DRS and XPS analyses revealed that Y2O3:Er3+-Yb3+ modified the bandgap of the TiO2 host.
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