LiCaPO_4:Eu^(3+)材料制备白光LED及其发光特性  

Preparation and luminescent characteristics of white LED with LiCaPO_4:Eu^(3+) phosphor

作　　者：王志军[1] 李盼来[1] 杨志平[1] 郭庆林[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《光电子．激光》2011年第5期718-721,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(50902042);河北省自然科学基金资助项目(E2009000209;E2010000283);河北省教育厅基金资助项目(2009313);发光与光信息技术教育部重点实验室研究基金资助项目(2010LOI12)

摘　　要：采用高温固相法制备了LiCaPO4:Eu3+红色发光材料,研究了Eu3+掺杂浓度、R+或Cl-等对材料发光性质的影响。结果显示,在399 nm近紫外光激发下,材料呈多峰发射,分别由Eu3+的5D0→7FJ(J=0,1,2,3,4)能级跃迁产生,主峰为612 nm;监测612 nm发射峰,所得激发光谱由O2-→Eu3+电荷迁移带(200~350 nm)和f-f高能级跃迁吸收带(350~450 nm)组成,主峰为399 nm。Eu3+浓度为5%时,LiCaPO4:Eu3+材料的发射强度最大;依据Dexter理论,得出浓度猝灭机理为电偶极-电偶极相互作用;添加R+或Cl-提高了LiCaPO4:Eu3+材料的发射强度,且Li+和Cl-的效果最好。A novel red emitting phosphor LiCaPO4：Eu3＋ was synthesized by the high temperature solid state reaction method,and the effects of Eu3＋ content,R＋ and Cl-on the luminescent properties of the phosphor were investigated.LiCaPO4：Eu3＋ phosphor presents several emission peaks under 399 nm excitation,which correspond to the 5D0→7FJ（J=0,1,2,3,4） transition of Eu3＋,respectively,and the highest emission is located at 612 nm.At 612 nm emission,the excitation spectrum contains 200-350 nm and 350-450 nm two excitation bands,which correspond to a weak charge transition broad band absorption CTS and a strong f-f transition absorption of Eu3＋,respectively,and the highest peak is located at 399 nm.The emission intensity of the phosphor is influenced by Eu3＋ content,and reaches the maximum at 5% Eu3＋.The concentration quenching mechanism is the d-d interaction by Dexter theory.Under the conditions of R＋ or Cl-incorporated in the phosphor,the emission intensity can be enhanced,and it is found that Li＋ and Cl-can exhibit the strongest charge compensation ability.

关 键 词：白光LED 发光 LiCaPO4:Eu3+ 

分 类 号：O644[理学—物理化学] O482.31[理学—化学]