摘要
采用高温固相法合成了一种新型近红外发光材料Mg 2-x SnO4:x Cr^3+。利用X射线粉末衍射仪对样品的结构进行了表征,证明所得到的荧光粉具有单一尖晶石结构,掺杂离子的加入并没有改变晶体结构。利用荧光光谱和荧光衰减光谱对荧光粉的发光性质进行了研究。当被470 nm的蓝光激发时,荧光粉在700 nm处出现一个尖锐的发射峰(R锐线)和中心发射在750 nm处的宽带发射峰,分别归属于Cr^3+的2E→4A2和4T2(4F)→4A 2跃迁。研究不同浓度Cr^3+掺杂对样品发光性质的影响,发现样品的发光强度随着Cr^3+浓度的增加而增大。当Cr^3+掺杂浓度x=0.02时达到最大值,之后出现发光强度的猝灭,猝灭机理为多极相互作用。样品的荧光寿命随着Cr^3+掺杂浓度的增大逐渐减小,从而证明Cr^3+之间存在着能量传递现象。Mg2-x SnO4:x Cr^3+系列荧光粉还表现出了近红外长余辉发光性质。
A novel near-infrared luminescent material Mg 2-x SnO4:x Cr^3+was synthesized by high temperature solid phase method.The structure of the sample was characterized using X-ray powder diffractometer.It was proved that the obtained phosphor had a single spinel structure,and the addition of doping ions did not significantly change the crystal structure.The luminescent properties of the samples were investigated using fluorescence spectroscopy and fluorescence decay spectroscopy.When excited at 470 nm,the phosphor exhibits a sharp emission at 700 nm and a strong broad band emission centered at 750 nm,which belong to the 2E→4A 2 and 4T 2(4F)→4A 2 transitions of Cr^3+respectively.The effects of Cr^3+doping concentrations on the luminescence properties of the samples were investigated.It was found that the luminescence intensity of the samples increased with the increase of Cr^3+concentration and reached its maximum at x=0.02.Then luminescence intensity quenching occurred and the quenching mechanism is the electric dipole-electric dipole interaction.The fluorescence lifetime of the sample decreases with the increase of Cr^3+doping concentration,which proves that there is energy transfer between Cr^3+ions.The Mg 2-x SnO4:x Cr^3+phosphors also exhibit near-infrared long-lasting luminescence properties.
作者
蔡吉泽
庞然
于湛
刘丽艳
李成宇
CAI Ji-ze;PANG Ran;YU Zhan;LIU Li-yan;LI Cheng-yu(School of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China;State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2019年第12期1505-1513,共9页
Chinese Journal of Luminescence
基金
国家重点研发计划(2016YFB07010003)
辽宁省教育厅科学研究经费项目(LJC201902)资助~~
关键词
Mg
2SnO
4
近红外发光
荧光材料
光谱性质
余辉
Mg 2SnO 4
near infrared luminescence
fluorescent material
optical properties
afterglow
