Eu^(3+)掺杂Gd_(9.33)(SiO_4)_6O_2微晶玻璃的制备及发光性能研究

Preparation and Luminescence Properties of Eu^(3+) Doped Gd_(9.33)(SiO_4)_6O_2 Glass Ceramic

采用高温熔融法制备Si O2-Na F-Na2O-Gd2O3-Eu2O3系基质玻璃,热处理后获得微晶玻璃.通过差热分析(DTA)、X射线衍射(XRD)、电子扫描电镜(SEM)和荧光光谱等对样品进行分析.XRD结果表明:基质玻璃经700、750℃热处理2~4 h获得含Gd9.33(Si O4)6O2的微晶玻璃.晶粒尺寸随热处理温度的升高和时间的延长而增大.荧光光谱研究结果表明:与基质玻璃相比,微晶玻璃的激发强度和发射强度明显增强,微晶玻璃中电荷迁移带发生偏移,5D0—7F1跃迁的发射峰出现劈裂,5D0—7F2与5D0—7F1跃迁强度比值减小,表明Eu3+进入Gd9.33(Si O4)6O2晶格中;微晶玻璃中5D0—7FJ特征发射峰和激发峰强度随热处理温度的升高和热处理时间的延长而增强.

The Si O2-Na F-Na2O-Gd2O3-Eu2O3 precursor glasses were prepared by high temperature melting method,and glass-ceramics was obtained by heat treatment. The samples were characterized by differential thermal analysis（ DTA）,X-ray diffraction（ XRD）,scanning electron microscope（ SEM） and fluorescence spectra. The XRD results showthat glass ceramic containing Gd9. 33（ Si O4）6O2is obtained by heat treating the precursor glass at 700 ℃ 、750 ℃ for 2 - 4 h,and the average crystallite size increases with increase of heat treatment temperature and time. Compared with that of precursor glass,the emission and excitation intensities of the glass ceramic are improved obviously,CTB shows a red-shift after annealing,the splitting emission peaks from5D0—7F1of Eu3 ＋are observed,and relative intensities ratio of5D0—7F2/5D0—7F1decrease compared with that of precursor glass,respectively. All these indicate the Eu3 ＋ions are incorporated into Gd9. 33（ Si O4）6O2nanocrystal phase. The intensities of emission and excitation peaks of glass ceramic increase with the increase of heat treatment temperature and time.