白光LED用MSrAl3O7:Eu2+(M=Y,La,Gd)绿色发光材料合成及其光学性能

功能材料, 2009, 40(9): 1432-1435.

白光LED用MSrAl3O7:Eu2+(M=Y,La,Gd)绿色发光材料合成及其光学性能

夏志国 ^1, , 杜海燕 ^2, , 孙家跃 ^3, , 王雪峰 ^4,

1.中国地质大学(北京)材料科学与工程学院,北京,100083

2.北京工商大学,化学与环境工程学院,北京,100048

3.北京工商大学,化学与环境工程学院,北京,100048

4.中国地质大学(北京)材料科学与工程学院,北京,100083

基金项目: 北京市自然科学基金(2082009,20091002) 国家自然科学基金(20876002)

关键词：白光LED , 绿色发光材料 , 光致发光

Synthesis and optical properties of green-emitting MSrAl3O7:Eu2+ (M= Y, La,Gd) phosphors for white light-emitting diodes

采用传统的高温固相合成技术制备出一系列组成为MSrAl3O7:Eu2+(M=Y,La,Gd)的新型绿色发射荧光体.通过X射线衍射(XRD)研究其晶体结构发现:MSrAl3O7:Eu2+系列荧光体属于M2O3-SrO-Al2O3赝三元体系的稳定结晶相.荧光光谱测试表明:MSrAl3O7:Eu3+(M=Y、La、Gd)材料均是优良的白光LED用绿色荧光体,可被近紫外(300～450nm)有效激发,产生较强的绿色发射光,发射主峰位于517nm左右,样品的紫外-可见(UV-vis)光谱进一步证实了其有效吸收近紫外光的特征.研究还发现,在MSrAl3O7:Eu2+(M=Y、La、Gd)系列荧光体中,LaSrAl3O7:Eu2+具有最强的绿色发射光,进一步地比较不同温度下LaSrAl3O7:Eu2+材料的结构与光谱特性表明,1400℃合成的样品具有稳定的结构和最佳的发光性能.

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