纳米CeO_2∶Er荧光粉的光声光谱和荧光光谱研究  

Photoacoustic and Luminescence Studies on Nanocrystalline CeO_2∶Er Phosphors

作　　者：于锡娟[1] 宋慧宇[1] 苏庆德[1] 谢平波[2] 

机构地区：[1]中国科学技术大学化学系,安徽合肥230026 [2]中山大学超快速激光光谱国家重点实验室,广东广州510275

出　　处：《中国稀土学报》2003年第1期93-97,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目(29875026)

摘　　要：采用燃烧法合成了CeO2∶Er纳米荧光粉,研究了不同粒径大小的CeO2∶Er的晶型和晶貌。TEM结果表明无定形CeO2∶Er包围着纳米晶CeO2∶Er,可起到表面修饰的作用。光声光谱在保持纳米材料表面状态不改变的前提下,分析了不同粒径的CeO2∶Er的光谱性质,解释了随纳米粒径减小CeO2光谱峰吸收峰有蓝移而Er3+没有明显谱峰位移的原因。在荧光光谱中,发现小粒径的CeO2∶Er有较大的红绿发射比,并对该现象进行了解释。Nanocrystalline CeO2∶Er phosphors with an average crystalline size of 18, 38, 70 nm were prepared by glycinenitrate solution combustion synthesis. The microstructure and morphology of nanoparticle CeO2∶Er were investigated by transmission electron microscope. The photoacoustic spectra of CeO2∶Er with different particle sizes were measured in the condition of keeping the surface state of the nanocrystalline unchanged. The results show that with the particle size decreasing, the absorption peak of CeO2 shifts to blue, while the peak of Er3+ does not move. In the luminescence spectra, the smaller the crystalline size is, the larger the redtogreen ratio of Er3+ emission bands is. A possible explanation of these behaviors was proposed.

关 键 词：无机化学 光声光谱 荧光光谱 纳米CeO2:Er 燃烧法合成 稀土 

分 类 号：O614.33[理学—无机化学] O433.5[理学—化学]