【摘要】 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iσn达1.931×10-21cm2,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。更多还原

【Abstract】 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 about890nm,1065nm and1330nm are observed,which are correspondent to transitions of 4F3/2→4I9/2,4F3/2→4I11/2and4F3/2→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 theβ-eucryptite solid solutions with the grain size in the range of10 ~ 20nm,and the effective stimulated cross sectioniσnis1.931×10-21cm2at1065nm,which increases by8% in contrast to the host glass.Quenching occurs when Nd3+ions locate atβ-eucryptite solid solution with the grain size close to the visible light wavelength.Quenching disappears afterβ-eucryptite solid solution are re-crystallized intoβ-spodumene solid solutions.更多还原