LiSrPO_4:Tb^(3+)荧光粉的制备及发光特性  

Luminescent Properties of LiSrPO_4:Tb^(3+) Green Phosphor

作　　者：杨志平[1] 马欣[1] 宋兆丰[1] 王凤和[1] 郭颖楠[1] 闻建伟[2] 

机构地区：[1]河北大学物理科学与技术学院发光与显示研究所,河北保定071000 [2]河北大学电子信息工程学院,河北保定071000

出　　处：《发光学报》2010年第2期185-188,共4页Chinese Journal of Luminescence

基　　金：河北省自然科学基金(F2009000217)资助项目

摘　　要：采用高温固相法合成了LiSrPO4:Tb3+发光材料,测定了荧光粉的激发光谱和发射光谱,该荧光粉的激发主峰位于330～390nm,属于4f→4f电子跃迁吸收,与UVLED管芯相匹配。在紫外激发下的发射峰由位于490nm(5D4-7F6)、545nm(5D4-7F5)、585nm(5D4-7F4)、622nm(5D4-7F3)的四组线状峰构成,对应Tb3+的特征跃迁,其中545nm处最强,呈现绿色发光。考察了掺杂离子浓度对样品发光效率的影响,Tb3+的最佳掺杂摩尔分数为9%,分析了其自身浓度猝灭机理,探讨了敏化剂Ce3+离子的加入对荧光粉发光强度的影响。LiSrPO4:Tb3+是一种适用于白光LED的绿色荧光材料。The LiSrPO4：Tb^3＋ green phosphor was synthesized by the general high temperature solid-state reaction and an efficient green emission under near-ultraviolet excitaion was observed.The X-ray diffraction pattern indicated that pure LiSrPO4：Tb^3＋ phosphor was obtained.Its luminescence properties were investigated and showed four major emission peeks locating at 490,545,585 and 622 nm,corresponding to the ^5D4→^7F6,^5D4→^7F5,^5D4→^7F4 and ^5D4→^7F3 typical transitions of Tb^3＋,respectively,and the strongest one appears at 545 nm.The excitation spectrum contains a broad band extending in 200～400 nm,which is coupled well with the emission of ultraviolet light-emitting diodes （UVLEDs）.The influence of the doped content of Tb^3＋ ions on the emission intensity was also investigated and the concentration quench occurs when the doped content of Tb^3＋ ions is beyond 9%,which can be explained by electric multipole-multipole interaction according to Dexter＇s theory.It was also found that the Ce^3＋ ions in the system can make the emission intensity of LiSrPO4：Tb^3＋ increase.The value of emission intensity reaches the maximum when the concentration of Ce3＋ ions is 3%.In conclustion,the LiSrPO4：Tb^3＋ is a potential green-emitting phosphor for white LEDs.

关 键 词：荧光粉 LiSrPO4 TB3+ 白光LED 

分 类 号：O482.31[理学—固体物理]