SrLiAl_3N_4∶Eu^(2+)红色荧光粉的制备与发光特性  

Syntheis and Luminescence Properties of SrLiAl_3N_4∶ Eu^(2+) Red Phosphor

作　　者：杨志平[1] 方恒九 李旋旋 冉争瑞 王天洋[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002 [2]河北大学电子与信息工程学院,河北保定071002 [3]河北利福光电技术有限公司,河北保定071002

出　　处：《发光学报》2016年第1期1-6,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(50902042);河北省自然科学基金(F2009-000217)资助项目

摘　　要：使用高温固相法于还原气氛中合成了SrLiAl_3N_4∶Eu^(2+)荧光粉并研究了其晶体结构和发光性质。样品均可以被蓝光或紫外光有效激发发射红光。XRD和SEM图谱显示合成了单相SrLiAl3N4。粉体的激发光谱在200~600nm波长范围内呈现出双峰宽带激发带,在267nm、474nm处分别有一个激发峰。发射光谱仅有一个宽带发射峰,峰值在654nm处,属于Eu^(2+)离子的5d→4f特征跃迁。荧光粉发光强度与Eu^(2+)离子掺杂摩尔分数之间的关系表明:随着Eu^(2+)离子掺杂摩尔分数的增加,粉体发光强度先上升后下降,最佳掺杂摩尔分数为0.4%,继续增大Eu^(2+)离子的掺杂量会发生浓度猝灭现象。所准备的SrLiAl_3N_4∶Eu^(2+)荧光粉具有较好的热稳定性和较高的量子效率。Sr Li Al3N4∶ Eu^2＋red-emitting phosphors were prepared in reducing atmosphere by high temperature solid-state reaction which could be effectively excited by ultraviolet and blue light. Luminescence properties and crystal structure of the phosphors were investigated. X-ray diffraction patterns and scanning electron microscopy image show that the sample is a pure phase of Sr Li Al3N4. In the excitation spectrum（ from 200 to 600 nm）,there are two wide bands and peaks at 267 nm and474 nm. The emission spectrum shows a wide band with a peak at 654 nm corresponding to the 5d→4f transition of Eu^2＋. The effect of the doping concentration of Eu^2＋was investigated. The result shows that the luminescent intensity firstly increases and then decreases with the increasing of Eu^2＋mole fraction,and the best doping mole fraction of Eu^2＋is 0. 4%. The concentration quenching will occur if Eu^2＋continue to be doped. The phosphors have good thermal quenching properties and quantum efficiency.

关 键 词：高温固相法 荧光粉 红光 EU^2+ 

分 类 号：O482.31[理学—固体物理]