通过高温熔融法和热处理成功制备了白光发光的Eu2+/Eu3+掺杂SiO2-Al2O3-ZnO-K2CO3微晶玻璃。测试了微晶玻璃的X射线衍射谱(XRD)、激发光谱和荧光光谱。研究发现,X射线衍射谱表明了玻璃基质中存在βZn2SiO4纳米晶粒,根据XRD结果和Scherrer 公式计算得到βZn2SiO4晶粒大小约为35 nm。在紫外光激发下,观察到强烈的宽带蓝光(400-460 nm)和红光 (574,587,611,650和700nm)发光,分别对应Eu2+的4f65d→4f7能级跃迁以及Eu3+的5D0→7FJ(J=0,1,2,3,4)能级跃迁,与未热处理玻璃样品相比较,微晶玻璃的发光强度大大增强。研究结果表明,Eu2+/Eu3+掺杂的 SiO2-Al2O3-ZnO-K2CO3微晶玻璃是一种白光LED潜在的基质材料。

A new white phosphorescent glass-ceramic Eu2+/Eu3+ doped SiO2-Al2O3-ZnO-K2CO3 is prepared by the melt quenching method and subsequent heat treatment. It′s X-ray diffraction (XRD) pattern,excitation spectrum and emission spectrum are measured and recorded at room temperature. By the X-ray diffraction diffusion (XRD) data,βZn2SiO4 is demonstrated to be the crystallites in the glass-ceramic. Based on the Scherrer equation,the average size about 35 nm of βZn2SiO4 nanocrystals is calculated. The intense blue emission band (400-460 nm) and red emissions (574,587,611,650 and 700 nm) assigned to 4f65d→4f7 transition of Eu2+ ion and 5D0→7FJ (J=0,1,2,3,4) transitions of Eu3+ ion respectively. They are simultaneously observed at room temperature under 372 nm excitation in the glass ceramics and the emission luminescence intensity increased significantly compared with the as-made glass. The results indicate that Eu2+/Eu3+ doped SiO2-Al2O3-ZnO-K2CO3 glass-ceramic can act as suitable materials for LED phosphors.