Amira Guesmi, Chaker Bouzidi, Habib Elhouichet
Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, BP 95, Hammam-Lif 2050, Tunisia.
Laboratoire de Physico-chimie des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, BP 95, Hammam-Lif 2050, Tunisia; Department of Physics, Sciences Faculty of Tunis, University of Tunis El Manar, Tunis 2092, Tunisia.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Apr 15;177:164-169. doi: 10.1016/j.saa.2017.01.039. Epub 2017 Jan 22.
Undoped and Dy (0.25, 0.5, 0.8 and 1.5at.%) doped ZnO were elaborated by solid-state reaction method. The ZnO:Dy samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, UV-vis diffuse reflectance spectroscopy and photoluminescence (PL). The XRD analysis confirms the wurtzite structure of ZnO. A slight shift to lower angles, of the (101) peak, is seen with Dy content, indicating the substitution of these ions into the ZnO lattice. Raman study indicates the good crystallinity of all ZnO:Dy samples and confirms the substitution of Zn by Dy. The band gap energy was found to increase then decrease with Dy content. The PL excitation spectra (PLE) of Dy showed six excitation bands with hypersensitive at 346nm (H→P). PL spectra show principally three emission bands relatives to F→H (476nm), F→H (567nm) and F→H (658nm) transitions. The concentration dependency of PL intensity indicates a quenching for Dy concentration above 0.5at.%. The PL lifetime of F metastable state was measured and discussed for all Dy content in ZnO. The temperature dependency of PL intensity is investigated for ZnO:Dy (0.5%) sample and the activation energy is determined. The CIE chromaticity color coordinate shows that ZnO:Dy can be useful for white luminescence applications.
采用固相反应法制备了未掺杂和Dy（0.25、0.5、0.8和1.5at.%）掺杂的ZnO。利用X射线衍射（XRD）、拉曼光谱、紫外-可见漫反射光谱和光致发光（PL）对ZnO:Dy样品进行了表征。XRD分析证实了ZnO的纤锌矿结构。随着Dy含量的增加，（101）峰向低角度略有偏移，表明这些离子取代了ZnO晶格中的离子。拉曼研究表明所有ZnO:Dy样品具有良好的结晶性，并证实了Dy对Zn的取代。发现带隙能量随Dy含量先增加后降低。Dy的光致发光激发光谱（PLE）显示出六个激发带，在346nm处有超灵敏激发带（H→P）。PL光谱主要显示出与F→H（476nm）、F→H（567nm）和F→H（658nm）跃迁相关的三个发射带。PL强度的浓度依赖性表明，Dy浓度高于0.5at.%时会发生淬灭。测量并讨论了ZnO中所有Dy含量下F亚稳态的PL寿命。研究了ZnO:Dy（0.5%）样品PL强度的温度依赖性，并确定了激活能。CIE色度坐标表明ZnO:Dy可用于白色发光应用。
