Structural evolution and enhancement of luminescence in the Eu-doped oxyfluoride glass ceramics containing NaGdF4 nanocrystals
Structural evolution and enhancement of luminescence in the Eu-doped oxyfluoride glass ceramics containing NaGdF4 nanocrystals
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含NaGdF4纳米晶的Eu掺杂氟玻璃陶瓷的结构演变和发光增强
DOI：
10.1039/c3ce40629f
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发表时间：
2013-08
期刊：
影响因子：
3.1
通讯作者：
Xu, Shiqing
中科院分区：
文献类型：
--
作者：
Zhao, Shilong;Wang, Xiuli;Sun, Xiao;Jia, Guohua;Huang, Lihui;Deng, Degang;Xin, Fengxia;Xu, Shiqing
通过改变含有NaGdF4纳米晶的Eu3+掺杂氟硼硅酸盐玻璃陶瓷中SiO2/B2O3含量的比例，同时实现立方相到六方相的演化、窄晶粒尺寸分布和增强发光。根据红外光谱、粘度、XRD 和 TEM 数据讨论了 NaGdF4 纳米晶的相演化机制。结果表明，热处理过程中产生的应力在相演化中起着重要作用，这首次为结晶过程中压力诱导的无序到有序相演化提供了实验证据。研究还发现氟玻璃陶瓷中Eu3+离子的激发和发射光谱以及发光寿命对NaGdF4晶格敏感。
Cubic-to-hexagonal phase evolution, narrow crystalline size distribution and enhancement of luminescence are simultaneously achieved by modifying the ratio of SiO2/B2O3 content in the Eu3+-doped oxyfluoride borosilicate glass ceramics containing NaGdF4 nanocrystals. The mechanisms of phase evolution of NaGdF4 nanocrystals are discussed on the basis of IR spectra, viscosity, XRD and TEM data. The results indicate that the stresses developed during the thermal treatment process play an important role in the phase evolution, which provides an experimental evidence of pressure-induced disorder-to-order phase evolution during the crystallization process for the first time. It is also found that the excitation and emission spectra as well as the luminescence lifetimes of the Eu3+ ions in the oxyfluoride glass ceramic are sensitive to the crystal lattice of NaGdF4.
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