非均相沉淀法制备的Sr_(3-x)Si_(1-x)Al_xO_5:xCe^(3+)荧光粉及其发光性能  

Luminescent Properties of Sr_(3-x)Si_(1-x)Al_xO_5:xCe^(3+) Phosphors Prepared by Heterogeneous Precipitation Method

作　　者：彭杰[1] 曾人杰[1,2] 李郎楷[1] 

机构地区：[1]厦门大学材料学院,福建厦门361005 [2]福建省特种先进材料重点实验室,福建厦门361005

出　　处：《发光学报》2012年第9期966-972,共7页Chinese Journal of Luminescence

基　　金：福建省科技重大专项(2005HZ02-2);福建省重大平台建设基金(2006L2003)资助项目

摘　　要：采用非均相沉淀法制备了Sr3-xSi1-xAlxO5∶xCe3+荧光粉,并与高温固相法制备的该荧光粉进行了对比。以XRD、SEM和荧光光谱分析来表征所制备的荧光粉。结果表明,非均相沉淀法比高温固相反应法制备的荧光粉相纯度更高,颗粒分布更窄,晶面清晰,团聚程度小,相对发光强度也更高。荧光粉的激发光谱为270～500 nm的双峰宽带,最强激发峰位于417 nm处。发射光谱为450～700 nm的单峰宽带,峰值位于525nm处。电荷补偿剂对荧光粉相对发光强度影响较大,外加Al3+置换Si4+作为电荷补偿剂比外加Li+置换Sr2+的效果更好。Phosphors of nominal composition Sr3-xSi1-xAlxO5∶xCe3＋ were prepared by heterogeneous precipitation method and high temperature solid state reaction method,respectively.The phosphors were characterized by XRD,SEM and fluorescence spectrum analysis.The results show that phosphors synthesized by heterogeneous precipitation method have higher phase purity,narrower particle size distribution,clearer crystal surface and lighter aggregation,also yield higher relative luminous intensity,than those by high temperature solid state reaction method.The excitation spectra of the phosphors range from 270 nm to 500 nm with the bimodal broadband,while the strongest excitation peak at 417 nm.The emission spectra range from 450 nm to 700 nm with single-peak broadband,with peak at 525 nm.Charge compensation has a great influence on the relative luminous intensity of phosphors.It could be conclude that adding Al3＋ to substitute Si4＋ as charge compensation might be better than adding Li＋ to substitute Sr2＋.

关 键 词：白光LED 电荷补偿 硅酸盐 团聚 

分 类 号：O482.31[理学—固体物理]