Tb³⁺/Eu³⁺共掺杂的CaMoO₄荧光粉在防伪技术领域的应用

The Application of Tb³⁺/Eu³⁺ Codoped CaMoO₄ Phosphors in the Field of Anti-Counterfeiting Technology

摘要: 本文采用化学共沉淀的方法合成了Tb³⁺/Eu³⁺共掺杂的CaMoO₄荧光粉。通过X射线衍射仪(XRD)和场发射扫描电镜(FE-SEM)对样品的晶体结构和形貌进行了表征，测量了各样品的发射光谱和激发光谱，通过光谱发现Tb³⁺到Eu³⁺存在着能量传递，计算了各样品分别在274 nm、394.5 nm和486 nm激发下的色坐标，通过计算和比较色坐标的标准差，发现当Tb³⁺掺杂浓度为5%，Eu³⁺掺杂浓度为0.5%时样品色坐标的标准差最大，说明此掺杂浓度下的荧光粉的颜色随激发波长变化最明显，表明此掺杂浓度下的荧光粉可能应用于防伪技术领域。

Abstract: Series of CaMoO₄: Tb³⁺, Eu³⁺ phosphors were prepared by the method of precipitation. The structure and morphology of the phosphors were characterized by the X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). The photoluminescence properties of the prepared products were researched, find the energy can transfer from Tb³⁺ to Eu³⁺. Calculated the color coordinates of the phosphors under the excitation of 274 nm, 394.5 nm and 486 nm, by calculating and comparing the standard deviation of the color coordinates, when the concentration is 5% Tb³⁺, 0.5% Eu³⁺, the standard deviation of the color coordinates is the maximum. Illustrating the doping concentrations of phosphor color change with excitation wavelength is the most obvious. It is indicated that the fluorescent powder may be used in the field of anti-counterfeiting technology.