Crystal structure evolution and luminescence property of Ce3+-doped Y2O3- Al2O3-Sc2O3 ternary ceramics
Crystal structure evolution and luminescence property of Ce3+-doped Y2O3- Al2O3-Sc2O3 ternary ceramics
复制标题
Ce3掺杂Y2O3-Al2O3-Sc2O3三元陶瓷的晶体结构演化及发光性能
DOI：
10.1016/j.jeurceramsoc.2019.10.022
复制
发表时间：
2019
影响因子：
5.7
通讯作者：
Shiwei Wang
中科院分区：
文献类型：
--
作者：
Yingli Liu;Song Hu;Yunli Zhang;Zhengjuan Wang;Guohong Zhou;Shiwei Wang
采用固相反应法制备了不同Sc2 O3含量的Ce 3+掺杂Y2 O3-Al 2 O3-Sc2 O3三元陶瓷。通过粉末X射线衍射、45 Sc和27 Al固体核磁共振（NMR）、扫描电子显微镜（SEM）和光致发光（PL）等表征手段，研究了它们的组成、晶体结构、微观结构和发光性能。可以得到具有石榴石结构和均匀显微结构的单相YSAG透明陶瓷。NMR结果表明，部分[AlO 6]八面体转化为[AlO 4]四面体与增加Sc 3+。一部分Sc ~（3+）占据剩余的八面体位置，另一部分Sc ~（3+）占据十二面体位置。所制备的陶瓷的发光光谱显示出加宽的发射带与过量的Sc 3+掺入。更重要的是，由于Sc 3+的引入，Ce 3+在石榴石陶瓷中的溶解度大大增加，导致发射光谱的可补偿的红移和加宽，而发光下降很小，表明新的陶瓷磷光体具有改善的显色指数，有望用于白光照明。
Ce3+-doped Y2O3-Al2O3-Sc2O3ternary ceramics with varying Sc2O3were prepared via solid-state-reactive method. Their constitutions, crystal structures, microstructures and luminescence properties were thoroughly investigated by powder X-ray diffraction,45Sc and27Al solid-state nuclear magnetic resonance (NMR), scanning electron microscope (SEM) as well as photoluminescence (PL) characterizations. Single-phased YSAG transparent ceramics with garnet structure and homogeneous microstructures can be obtained. The NMR results suggest that partial [AlO6] octahedrons are converted into [AlO4] tetrahedrons with increased Sc3+. Partial Sc3+occupies the remaining octahedral sites, the other Sc3+occupies the dodecahedral sites. The luminescence spectra of the as-prepared ceramics show broadened emission bands with excessive Sc3+incorporation. More significantly, the solubility of Ce3+in garnet ceramics extensively increases due to the incorporation of Sc3+, leading to a considerablered-shift and broadening of emission spectra with little luminescence decline, indicating that the new ceramic phosphors are promising forwhite-light illumination with improved color rendering index.