Eu^2＋掺杂浓度对Ca2MgSi2O7∶Eu^2＋荧光粉发光特性的影响

曹仕秀; 韩涛; 涂铭旌

重庆文理学院材料交叉学科研究中心,重庆,402168

The effect of Eu^2＋ doping concentration on luminescence properties of Ca2MgSi2O7∶Eu^2＋ green phosphor

摘要: 采用化学共沉淀法制备了Ca2-xMgSi2O7：xEu2＋绿色荧光粉.用X射线衍射仪、荧光分光光度计及光色综合测试系统对Ca2-xMgSi2O7：xEu2＋绿色荧光粉的相结构、发光性能进行了测试.结果表明：其激发光谱分布在300—480nm波长范围,谱峰位于389,430nm处,可以被InGaN管芯产生的360—480nm辐射有效激发;在波长为430nm蓝光激发下,其发射光谱谱峰位于531nm处.Ca2-xMgSi2O7：xEu2＋绿色荧光粉的发光强度随Eu2＋掺杂量的增加而增强,当Eu2＋掺杂量x为0.04时,发光强度达到最大值,而后开始降低,发生浓度猝灭.根据Dexter能量共振理论,浓度猝灭是由电偶极-电偶极相互作用引起的.

关键词:

Abstract: The Ca2-xMgSi2O7：xEu2＋ green phosphor is synthesized by chemical coprecipitation.X-ray diffraction and the fluorescence spectrophotometry are used to investigate the structural and the luminescent properties of the Ca2-xMgSi2O7：xEu2＋ green phosphor.The result shows that the excitation spectrum of the Ca2-xMgSi2O7：xEu2＋green phosphor extends from 300 nm to 480 nm,and the peaks appear around 389 and 430 nm,thus the phosphor can be excited effectively by InGaN chip in a range of 360—480 nm.The peak of the emission spectrum appears around 531 nm.The emission spectrum intensity first increases and then decreases with Eu2＋ doping concentration increasing.The strongest emission intensity is obtained when Eu2＋doping concentration reaches 0.04.The concentration self-quenching is attributed to the d-d interaction according to the Dexter theory.

Eu^2＋掺杂浓度对Ca2MgSi2O7∶Eu^2＋荧光粉发光特性的影响

重庆文理学院材料交叉学科研究中心,重庆,402168

关键词:

The effect of Eu^2＋ doping concentration on luminescence properties of Ca2MgSi2O7∶Eu^2＋ green phosphor

重庆文理学院材料交叉学科研究中心,重庆,402168

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