共掺La3+和过量Sr2+对荧光粉Sr1.96Eu0.04SiO4发光性质的影响

摘要/Abstract

摘要： 采用高温固相法制备了荧光粉Sr_1.96－xEu_0.04SiO₄∶xLa³⁺(x=0、0.01、0.02、0.03、0.04、0.05)和Sr_1.94+yEu_0.04La_0.02SiO₄∶ySr²⁺(y=0、0.05、0.10、0.20、0.30) .使用X射线粉末衍射仪、荧光分光光度计表征了荧光粉的物质结构和发光性质.结果表明:荧光粉的XRD均与Sr₂SiO₄标准卡片PDF 39-1256对应,没有杂质相产生.荧光粉Sr_1.96Eu_0.04SiO₄中掺入La³⁺能增强其发光强度,且发射峰的位置不变.当La³⁺掺杂量为2% (摩尔分数) 时,荧光粉Sr_1.94Eu_0.04La_0.02SiO₄的发光强度最强.在Sr_1.94Eu_0.04La_0.02SiO₄中掺入一系列过量浓度Sr²⁺,能增强其发光强度,且不改变发射峰的位置和形状.当Sr²⁺过量10%时,荧光粉的发光强度最强.荧光粉的宽带发射光谱可以拟合为2个独立的发射峰,对应Eu²⁺的4f⁶5d¹→4f⁷跃迁,2个发射峰的强度随着通气量的增大有规律变化,使得荧光粉的发光颜色从绿光区过渡到黄光区.

关键词: 荧光粉, 高温固相法, 稀土离子, 硅酸锶

Abstract: Sr_1.96－xEu_0.04SiO₄∶xLa³⁺(x = 0,0.01,0.02,0.03,0.04,0.05) and Sr_1.94+yEu_0.04La_0.02SiO₄∶ySr²⁺(y=0,0.05,0.10,0.20,0.30) were synthesized by high-temperature solid-state method. The structure and luminescence properties of the phosphors were characterized by X-ray powder diffractometer and fluorescence spectrophotometer. The results showed that the XRD of the phosphors are consistent with the Sr₂SiO₄ standard card PDF 39-1256, and no impurity phase is produced. The luminescence intensity of phosphors Sr_1.96Eu_0.0₄SiO₄ is enhanced by doped La³⁺, and the position of emission peak remain unchanged. The phosphors show the strongest luminescence intensity when the doped concentration of La³⁺ is 2% (molar fraction). The luminescence intensity of Sr_1.94Eu_0.04La_0.02SiO₄ can be further enhanced by doped series of excessive concentrations of Sr²⁺ without changed the position and shape of the emission peak. When Sr²⁺ is excessive 10%, the luminescence intensity of the phosphors is the strongest. The broadband emission spectrum of the phosphors can be fitted as two independent emission peaks, which correspond to Eu²⁺ 4f⁶5d¹→4f⁷ transition. The intensity of two emission peaks changes regularly with increasing ventilation volume, which give rise to the luminescence color of phosphors changes from green to yellow.

Key words: phosphors, high-temperature solid-state method, rare earth ions, strontium silicate

中图分类号:

TB34
Q061

王伟, 朱红波, 吴梅. 共掺La³⁺和过量Sr²⁺对荧光粉Sr_1.96Eu_0.04SiO₄发光性质的影响[J]. 兰州理工大学学报, 2024, 50(4): 12-16.

WANG Wei, ZHU Hong-bo, WU Mei. Effect of co-doped La³⁺ and excessive concentration Sr²⁺ on the luminescence properties of Sr_1.96Eu_0.04SiO₄[J]. Journal of Lanzhou University of Technology, 2024, 50(4): 12-16.

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共掺La³⁺和过量Sr²⁺对荧光粉Sr_1.96Eu_0.04SiO₄发光性质的影响

Effect of co-doped La³⁺ and excessive concentration Sr²⁺ on the luminescence properties of Sr_1.96Eu_0.04SiO₄

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