Ce^(3+),Tb^(3+)共激活Sr_2MgSi_2O_7基荧光粉的发光特性研究  

Study on the mechanism modulation of Sr_2MgSi_2O_7 base phosphor activated by Ce^(3+) and Tb^(3+)

作　　者：宁青菊[1] 刘波[1] 乔畅君[1] 曹舒尧 伍媛婷[1] 史永胜[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2016年第6期53-58,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51302161);陕西省科技厅科技攻关计划项目(2015GY173);西安市产学研协同创新计划项目(CXY1513-5)

摘　　要：采用微波辅助溶胶-燃烧法合成Sr_2MgSi_2O_7:xCe^(3+),yTb^(3+)荧光粉.通过综合热分析、X射线衍射(XRD)和光谱分析等方法对试样进行表征.结果表明:微波辅助溶胶-燃烧法在500℃~700℃下合成了单斜的Sr2MgSi2O7:xCe^(3+),yTb^(3+),合成温度比固相法低约700℃;在365nm紫外光的激发下,由于Ce^(3+)和Tb^(3+)发生能量传递,Sr_2MgSi_2O_7:xCe^(3+),yTb^(3+)荧光粉出现多峰发射,其中主峰位于380nm和545nm处,发光强度分别随x或y的改变而改变,色坐标在从(0.163 9,0.059 1)到(0.323 0,0.461 1),发光颜色可以从蓝光到黄绿光进行调制,由此可以对白光的色温进行调节,制备不同色温的白色荧光粉.Sr_2MgSi_2O_7：xCe^（3＋）,yTb^（3＋）phosphor was separately synthesized by microwave-assisted gel-combustion method.The structure and spectrum properties were characterized by therrmogravimetric differential scanning calorimeter（TG-DSC）,X-ray diffraction（XRD）and photoluminescence and photoluminescence excitation（PL-PLE）spectrum,respectively.The results reveal that,by using microwave-assisted gel-combustion method,Sr_2MgSi_2O_7：xCe^（3＋）,yTb^（3＋）phosphor can be synthesized under lower 700 ℃ when compared with the traditional solid-state method.Under 365 nm ultraviolet excitation,because energy transfer occurs between Ce^（3＋）and Tb^（3＋）ions,Sr_2MgSi_2O_7：xCe^（3＋）,yTb^（3＋）phosphor exhibits a series of emission peaks.The maximum peak locate in the vicinity of 380 nm and 545 nm.By properly tuning the relative composition of Ce^（3＋）/Tb^（3＋）（x/y）through the principle of energy transfer,the varied emitted colors from blue through cyan（greenish-blue）and the color coordinates from（0.163 9,0.059 1）to（0.323 0,0.461 1）.These results suggest that our developed Sr_2MgSi_2O_7：xCe^（3＋）,yTb^（3＋）phosphors have potential applications as color-tunable phosphorconverted materials for ultraviolet light-emitting diodes.

关 键 词：溶胶-燃烧法 SR2MGSI2O7 共激活 荧光粉 

分 类 号：TQ171[化学工程—玻璃工业]