采用传统熔融及退火技术,引入合适的添加剂于相对低温下成功制备出掺钕锂铝硅玻璃,通过控制成核和析晶工艺制备出锂铝硅玻璃陶瓷。采用差热分析、X射线衍射、扫描电镜、紫外可见近红外分光光度计和荧光光谱仪对材料进行表征。三个发光谱带中心波长位于890 nm,1065 nm和1330 nm处,分别对应于4F3/2→4I9/2,4F3/2→4I11/2和4F3/2→4I13/2跃迁。玻璃陶瓷晶相及晶粒大小对Nd3+离子发光性能影响很大。当Nd3+离子进入晶粒尺寸为10～20 nm的β--锂霞石固溶体时,发光强度与基质玻璃相比明显增强,在1065 nm处的受激发射截面σin达1.931×10-21 cm2,比基质玻璃受激发射截面提高了约8％。当β--锂霞石固溶体晶粒尺寸接近可见光波长时钕离子发生荧光猝灭。而当β--锂霞石固溶体晶型转变为β--黝辉石固溶体时,荧光猝灭消失。

The lithium aluminosilicate glasses doped with Nd3+ ions are synthesized using the conventional melting and quenching technique at a relatively low melting temperature by introducing approprate additives. Lithium aluminosilicate glasses are converted to glass-ceramics by controlling the nucleation and crystallization process. The samples are characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electronic microsope (SEM), UV-vis-NIR scanning spectrophotometer and fluorescence spectrometer. Three main fluorescence bands centering at about 890 nm, 1065 nm and 1330 nm are observed, which are correspondent to transitions of 4F3/2→4I9/2, 4F3/2→4I11/2 and 4F3/2→4I13/2, respectively. Crystal phases and the grain size of glass-ceramics are found to affect their luminescent characteristics considerably. The fluorescence intensity increases markedly when Nd3+ ions enter the β-eucryptite solid solutions with the grain size in the range of 10～20 nm, and the effective stimulated cross section σin is 1.931×10-21 cm2 at 1065 nm,which increases by 8% in contrast to the host glass. Quenching occurs when Nd3+ ions locate at β-eucryptite solid solution with the grain size close to the visible light wavelength. Quenching disappears after β-eucryptite solid solution are re-crystallized into β-spodumene solid solutions.