摘要
为了探索Eu3+在晶格位置中占据不同对称中心时的发光性质,采用高温固相法制备了BaM2ZnO5∶Eu3+(M=La,Gd)系列红色荧光粉,分别用X射线衍射(XRD)、扫描电镜(SEM)、荧光光谱(PL)对其晶体结构、形貌和发光性质进行了表征。结果表明,经1000℃烧结后可得到BaM2ZnO5(M=La,Gd)纯相,荧光粉的颗粒大小分布较均匀,粒径大约为3μm^5μm;BaM2ZnO5∶Eu3+(M=La,Gd)荧光粉可以被395 nm的近紫外光有效激发,BaLa2ZnO5∶Eu3+在595 nm处的发射峰为最强峰,对应于Eu3+的5D0→7F1(595 nm)磁偶极跃迁。Ba Gd2ZnO5∶Eu3+在627 nm处的发射峰为最强峰,对应于Eu3+的5D0→7F2(615 nm,627 nm)电偶极跃迁。
In order to study the luminescent properties of Eu^3＋ which occupied the different center of inversion in lattice,red phosphors of Eu^3＋ -dopped BaM2 ZnO5（M = La,Gd） were prepared by solid-state reaction. Structure and photoluminescence properties of the phosphors were characterized by X-ray diffraction（XRD）,scan electron microscopy（SEM）,photoluminescence spectrophotometer（PL）. XRD results showed that the pure phase of BaM2 ZnO5（M = La,Gd） could be obtained available after being fired at 1000 ℃. The particles have a slight agglomerate phenomenon with the diameter of about 3 - 5 μm.Ba La2 ZnO5Eu^3＋ phosphors could be effectively excited by the near UV irridiation（395 nm） and emit orange light at 595 nm due to the magnetic dipole^5D0→^7F1transitions on Eu^3＋ ,which indicated that Eu^3＋ occupied the symmetry sites in the BaLa2 ZnO5host lattice. Ba Gd2 ZnO5Eu^3＋ phosphors could be effectively excited by the near UV irridiation（395 nm） and emit orange light at 627 nm due to the forced electric dipole^5D0→^7F2transitions on Eu^3＋ ,which indicated that Eu^3＋ occupied the site without center of symmetry in the Ba Gd2 ZnO5host lattice.
出处
《稀土》
EI
CAS
CSCD
北大核心
2015年第1期64-68,共5页
Chinese Rare Earths
基金
国家自然科学基金项目资助(61264003)
广西自然科学基金项目资助(2011GXNSFA018054)
广西大学"大学生创新创业训练计划"项目资助(1301043)
关键词
高温固相法
荧光粉
发光
solid-state reaction
phosphor
luminescence
