摘要
通过高温熔融法和热处理成功制备了白光发光的Eu^(2+)/Eu^(3+)掺杂SiO_2-Al_2O_3-ZnO-K_2CO_3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β-Zn_2SiO_4纳米晶粒,根据XRD结果和Scherrer公式计算得到β-Zn_2SiO_4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Eu^(2+)的4f^65d→4f^7能级跃迁以及Eu^(3+)的~5D_0→~7F_J(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,Eu^(2+)/Eu^(3+)掺杂的SiO_2Al_2O_3-ZnO-K_2CO_3晶玻璃是一种白光LED潜在的基质材料。
A new white phosphorescent glass-ceramic Eu^（2＋）/Eu^（3＋） doped SiO_2-Al_2O_3-ZnO-K_2CO_3 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,β-Zn_2SiO_4 is demonstrated to be the crystallites in the glass-ceramic.Based on the Scherrer equation,the average size about 35 nm ofβ-Zn_2 SiO_4 nanocrystals is calculated.The intense blue emission band（400～460 nm） and red emissions（574,587,611,650 and 700 nm） assigned to 4f^65d→4f^7 transition of Eu^（2＋） ion and ~5D_0→~7F_J（J=0, 1,2,3,4） transitions of Eu^（3＋） 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 Eu^（2＋）/Eu^（3＋） doped SiO_2-Al_2O_3-ZnO-K_2CO_3 glass-ceramic can act as suitable materials for LED phosphors.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第4期1084-1087,共4页
Acta Optica Sinica
基金
国家自然科学基金(60508014
50772102)
教育部新世纪人才计划(NCET-07-0786)
浙江省自然科学基金(R406007)资助课题
