摘要
采用化学共沉淀法合成了Ca0.75Mg0.2Tb0.02Eu0.03(WO4)1-x(Mo O4)x(x=0~1.0)系列荧光粉,并对荧光粉的晶体结构和发光性能进行了表征。结果表明:不同Mo O42–掺杂量的样品均为四方相Ca0.75Mg0.2Tb0.02Eu0.03(WO4)1-x(Mo O4)x固溶体。在273 nm波长紫外光激发下,随着x的增大,Eu3+离子的发光强度先增强后减弱,当x=0.6时发光强度最强,为未掺杂Mo O42–样品的6倍。Mo O42–共掺杂改变了稀土离子周围的配位环境和局部晶体场的对称性,促进Eu3+离子4f电子的超敏跃迁,提高Eu3+的O2–→Eu3+电荷迁移跃迁,增加基体、Tb3+离子与Eu3+离子之间的能量传递。
The Ca0.75Mg0.2Tb0.02Eu0.03(WO4)1-x(Mo O4)x(x=0–1.0) series phosphors were synthesized by chemical co-precipitation method. The crystal structure and photoluminescence properties of the phosphors were characterized. The results show that the Ca0.75Mg0.2Tb0.02Eu0.03(WO4)1-x(Mo O4)x phosphors with different Mo O42– doped amounts belong to tetragonal phase solid. The luminous intensity of the phosphors under excitation of 275 nm firstly increases and then decreases with the increase of Mo O42– doped amount. When x=0.6, the luminous intensity of phosphor with Mo O42– doping is 6 times greater than that without Mo O42– doping. The surrounding environment of the rare earth ions and the symmetry of the local crystal field can be tuned by Mo O42– doping,thus improving the transfer efficiency of the O2–→Eu3+ electromigration and increasing the energy transfer efficiency of between the matrix and Tb3+ ions and Eu3+ ions.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第1期75-80,共6页
Journal of The Chinese Ceramic Society
基金
福建省自然科学基金(2013J05027)
福建省中青年教师教育科研项目(JA13050)
关键词
化学共沉淀法
钨酸钙
钼酸根离子掺杂
发光性能
chemical co-precipitation method
calcium tungstate
molybdate radical ion doping
photoluminescence properties
