Eu^(3+)掺杂CaF_2微晶玻璃的制备和发光性质

Preparation and luminescence properties of Eu^(3+) doped CaF_2 glass-ceramics

采用传统熔融法制备了系列Eu3+掺杂的SiO2-A12O3-CaO-CaF2-NaF-Eu2O3氟氧化物基质玻璃。通过优化组分和热处理温度,获得Eu3+掺杂的CaF2的微晶玻璃。用差热分析(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了分析。结果表明,基质玻璃经650℃热处理1 h后获得了Eu3+掺杂的CaF2的微晶玻璃,CaF2晶粒尺寸约为21 nm。与基质玻璃相比,微晶玻璃中5D0→7F2发射强度和激发强度增强,Eu3+离子局域对称环境降低。

A series of Eu doped SiO2-Al2O3-CaO-CaF2-NaF-Eu2O3 precursor glasses were prepared by a traditional glass melting method. Eu^3＋ doped CaF2 glass-ceramics was obtained by optimizing the composition of the precursor glasses and heat treatment temperature. The samples were characterized by differential thermal analysis （DTA） , X-ray diffraction （XRD） , scanning electron microscopy （SEM） and fluorescence spectra. The results show that glass ceramics containing CaF2 is obtained by heat treatment the precursor glass at 650 ℃ for 1 h. The average crystallite size of CaF2 nanocrystal is about 21 nm. Comparing with that of precursor glass, the emission intensity from ^5 D0-^7 F2 transition of Eu^3＋ ions and excitation intensity of glass ceramic increase. Eu^3＋ ions local symmetry environments decrease in the glass ceramics.