(Sr,Ba)Al_(12)O_(19)∶RE^(3+)(RE=Ce,Tb)的VUV发光及Ce^(3+)→Tb^(3+)的能量传递  

The VUV Luminescence Properties and the Ce^(3+)→Tb^(3+) Energy Transfer in the (Sr,Ba) Al_(12)O_(19)

作　　者：张忠义[1] 张韫宏[1] 李晓丽[2] 沈雷军[2] 韩莉[2] 周永勃[2] 徐建华[3] 黄艳[3] 

机构地区：[1]北京理工大学化学物理研究所,北京100081 [2]包头稀土研究院,内蒙古包头014030 [3]中国科学院高能物理研究所同步辐射实验室,北京100039

出　　处：《光谱学与光谱分析》2008年第8期1737-1740,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(20673012);内蒙古科技攻关项目(20020204)资助

摘　　要：采用高温固相反应合成磁铅矿型(Sr,Ba)Al12O19∶RE3+(RE=Ce,Tb)发光材料,X射线衍射结果证明生成单一磁铅矿型结构。Ce3+产生302nm的发射峰和340nm左右的不太明显的肩,分别对应于5d→2F5/2和5d→2F7/2跃迁;激发光谱显示两个宽带峰,158nm峰对应于基质吸收,260 nm峰是由4f-5d跃迁引起的。Tb3+的发射光谱显示特征的5D3→7Fj(j=2,3,4,5)和5D4→7Fj(j=4,5,6)跃迁;在激发光谱中,160nm左右的峰是由基质吸收和Tb3+-O2-电荷迁移带交迭产生的,193nm峰是Tb3+的4f-5d自旋允许跃迁引起的,233nm弱的峰是自旋禁戒4f-5d跃迁产生的。Ce3+的发射和Tb3+的f-f跃迁吸收(~320 nm)完全交迭,并且Tb3+的发光强度随Ce3+的浓度增加而增强,从激发光谱看出,Tb3+发光部分来自于Ce3+的吸收,具有Ce3+→Tb3+能量传递。The （Sr, Ba）Al12O19 ： RE^2＋ （RE=Ce, Tb） compounds have been synthesized by the solid state reaction technology. The single-phase magnetoplumbite-- type crystal structure has been identified by the X-ray diffraction analysis. The 302 nm peak and -340 nm not-clear shoulder are correspondence to the 5d→^2F5/2 and 5d→^2F7/2 transitions in the emission spectrum, respectively. The 158 nm peak and 260 nm peak are separately contributed to the host absorption and 4f-5d transition of Ces＋ in the excitation spectrum, The characteristic emission of ^5D3→^7Fj （j=2, 3, 4, 5）and ^5D4→^7Fj （j=4, 5, 6）transitions in the range of 400-600 nm are assigned in the emission spectrum of （Sr, Ba）Al12O19 ： Tb0.05^3＋. The -160 nm peaks arises from the overlap of the Tb^3＋-O^2- charge transfer band and the host absorption. The 193 nm and 233 nm peaks are attributed by the spin-allowed 4f- 5d transition and the spin-forbidden transition, respectively. The overlap between the emission of Ce^3＋ and the f-f transition absorption of Tb^3＋ exists in the （Sr, Ba）Al12O19 ： Tb^3＋ , Ce^3＋ compounds. The luminescence intensity of Tb^3＋ increases with the increase of the Ce^3＋ ion concentration. When the Ce^3＋ ion concentration reaches about 0.03 mole, the luminescence intensity of Tb^3＋ ion is nearly two times comparing with the non-codoping Ce^3＋ ion compounds. When the emission wavelength is 543 nm, the excitation spectra exhibit the 4f- 5d absorption of Ces＋ besides the host absorption and 4f-5d transitions of Tb^3＋ in the （Sr, Ba）All2O19 ： Tb^3＋ , Ce^3＋ compounds. According to the excitation spectrum, the part of the emission of Tb^3＋ comes from the absorption of Ce^3＋ ion. Therefore, it is illustrated that the Ce^3＋ →Tb^3＋ energy transfer has been existed in the （St, Ba）Al12O19 ： RE^3＋ （RE=Ce, Tb） compounds.

关 键 词：磁铅矿型铝酸盐 Ce^3+和Tb^3+ VUV 能量传递 

分 类 号：O482.3[理学—固体物理]