Liu Pei, Lv Shichao, Chen Xiaopu, Tang Junzhou, Li Jiang, Zhou Shifeng
Opt Express. 2018 Aug 6;26(16):20582-20589. doi: 10.1364/OE.26.020582.
The construction of cerium-doped materials is of great technological importance for various applications, including smart lighting, biological shielding and high-energy ray and particle detection. A major challenge is the efficient prevention of the undesired colorization after cerium doping. Here we present the nanocrystallization method for constructing colorless cerium-doped glass with extremely high cerium concentration (15 mol%). The structure and optical characterizations confirm that the notable color change of glass is associated with the precipitation of CeF crystalline phase during heat-treatment. The chemical state investigation shows that most of cerium ions exist in the form of Ce in both the glass and glass-ceramic samples. The chemical environment study indicates a dramatic change in the local structure unit from -Ce-O- to -Ce-F-, which is believed to dominate the decoloring phenomenon in cerium doped glass. As a result, a significant improvement in the ultraviolet excited luminescence (~35 times enhancement in intensity) and scintillating performance can be achieved, pointing to potential applications in X-ray detection.
铈掺杂材料的构建对于包括智能照明、生物屏蔽以及高能射线和粒子检测在内的各种应用具有重大的技术意义。一个主要挑战是有效防止铈掺杂后出现不期望的着色现象。在此，我们提出了一种用于构建具有极高铈浓度（15摩尔%）的无色铈掺杂玻璃的纳米晶化方法。结构和光学表征证实，玻璃显著的颜色变化与热处理过程中CeF晶相的析出有关。化学状态研究表明，在玻璃和玻璃陶瓷样品中，大多数铈离子都以Ce的形式存在。化学环境研究表明，局部结构单元从-Ce-O-到-Ce-F-发生了显著变化，这被认为是铈掺杂玻璃中脱色现象的主导因素。结果，可以实现紫外激发发光的显著改善（强度增强约35倍）和闪烁性能，这表明其在X射线检测方面具有潜在应用。
