Li_2SrSiO_4:Eu^(2+),Tb^(3+)中Eu^(2+)和Tb^(3+)的发光特性和能量传递  

Spectroscopic Properties and Energy Transfer of Eu^(2+)-Tb^(3+) Co-Doped Li_2SrSiO_4

作　　者：徐丽丽[1] 陈毅彬[1] 曾人杰[1] 

机构地区：[1]厦门大学材料学院,福建厦门361005

出　　处：《陶瓷学报》2011年第3期419-424,共6页Journal of Ceramics

基　　金：福建省科技重大专题资助项目(编号:2005HZ02-2)

摘　　要：用高温固相法在N2/H2=95/5(v/v)还原气氛下合成了Li2SrSiO4:Eu2+,Tb3+荧光粉发光材料,通过荧光光谱研究其发光特性,并从理论上探讨了Eu2+与Tb3+之间的能量转移类型。结果表明:该发光材料主发射峰值550nm,与Eu2+在4f7-4f65d1产生跃迁有关;通过掺杂,共存于Li2SrSiO4基质中的Tb3+通过电多级相互作用将能量传递给Eu2+;在500~650nm范围内对Eu2+具有很强的敏化作用,使其在主发射峰550nm的发射强度显著增强;当名义化学组成为Li2Sr0.995SiO4:0.005Eu2+,0.010Tb3+时,发光强度为最佳。Li2SrSiO4：Eu2＋,Tb3＋ phosphor was prepared by solid-state reaction at a high temperature in the reducing atmosphere [N2/ H2 = 95/ 5（v/ v）].The luminescence characteristics and the energy transfer between Eu2＋ and Tb3＋ in Li2SrSiO4 phosphor were discussed by means of the spectrofluorometry.The results indicated that in Li2SrSiO4 host the Eu2＋ emission was mainly from 4f7-4f65d1 transitions and possible to be sensitized by Tb3＋.The observed strong enhancement of the Eu2＋ emission for introducing Tb3＋ is attributed to the energy transfer effect from Tb3＋ to Eu2＋ through the electric multipolar interaction.Compared with Eu-doped Li2SrSiO4,the luminescence intensity of Eu2＋ and Tb3＋ co-doped phosphor was significantly improved.The maximum emission intensity could be achieved when the content of Eu2＋ equaled 0.005 and Tb3＋ equaled 0.010.

关 键 词：硅酸盐荧光粉 稀土 掺杂 能量传递 

分 类 号：TQ174.75[化学工程—陶瓷工业]