非均相沉淀法制备的Sr3-xSi1-xAlxO5∶xCe3+ 荧光粉及其发光性能

采用非均相沉淀法制备了Sr_3-xSi_1-xAl_xO₅∶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525 nm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。

Luminescent Properties of Sr3-xSi1-xAlxO5:xCe3+ Phosphors Prepared by Heterogeneous Precipitation Method

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+.