溶液燃烧法与Sol-Gel法制备BAM荧光粉的光谱特性对比分析

Spectra Comparison of BAM Blue-Emitting Phosphors Prepared by Combustion Synthesis and Sol-Gel Method

在空气中分别采用Sol-Gel法和溶液燃烧法制备了稀土Eu激活的BaMgAl10O17(BAM)荧光粉,并对其光谱特性进行了对比分析。结果表明,Sol-Gel法制备的BAM的荧光光谱与+3价Eu离子的光谱特征完全相符,为红光发射,其发射主峰位于617nm,属于占据非对称中心格位Eu3+的5D0→7F2的电偶极(ED)特征发射,而且由于晶场的作用使多重态的7FJ分裂为多个stark能级,导致5D0→7F1、5D0→7F3的发射峰裂分为多重峰;而溶液燃烧法制备的BAM的发光呈Eu2+离子的特征发射,为典型的蓝色发光,其发射光谱是一个最大峰值位于450nm的宽带谱,归属于Eu2+离子的4f65d→4f7(8S7/2)宽带允许跃迁。

BaMgAl10O17：Eu （BAM） phosphor has been prepared by solution combustion synthesis and Sol-Gel method in air, respectively. The spectra of the sample obtained from above both methods have been compared. The results show that the spectra of the sample by Sol-Gel coincide with the spectra of Eu^3＋. The predominant emission peak is at 617 nm, corresponding to the ^5Do→^7F2 electric-dipole transition of Eu^3＋. It shows the rare earth Eu^3＋ ions are located in the noncentrosymmetric sites. However, the emission spectra of the sample by solution combustion synthesis consist of a wide band with the peak at 450 nm, corresponding to the transition from the 4f^65d excited state to the 4f^7 ground state of Eu^2＋ ion. The blue emission is excellently consistent with CIE chromaticity standards.