Bartha Cristina, Secu Corina, Matei Elena, Negrila Catalin, Leca Aurel, Secu Mihail
National Institute for Materials Physics, 077125 Magurele, Romania.
Materials (Basel). 2020 Jul 3;13(13):2980. doi: 10.3390/ma13132980.
In this study, we report on the structural, magnetic, and optical properties of Tb-doped CeF nanocrystals prepared via a polyol-assisted route, followed by calcination. X-ray diffraction analysis and electron microscopy investigations have shown the formation of a dominant CeF nanocrystalline phase (of about 99%), with a relatively uniform distribution of nanocrystals about 15 nm in size. Magnetization curves showed typical paramagnetic properties related to the presence of Ce and Tb ions. The magnetic susceptibility showed a weak inflexion at about 150 K, assigned to the cerium ions' crystal field splitting. Under UV light excitation of the Ce ions, we observed Tb green luminescence with a quantum yield of about 20%.
在本研究中，我们报道了通过多元醇辅助法制备并经煅烧的铽掺杂氟化铈纳米晶体的结构、磁性和光学性质。X射线衍射分析和电子显微镜研究表明，形成了占主导的氟化铈纳米晶相（约99%），纳米晶体尺寸约15 nm，分布相对均匀。磁化曲线显示出与铈和铽离子存在相关的典型顺磁特性。磁化率在约150 K处出现微弱拐点，归因于铈离子的晶体场分裂。在铈离子的紫外光激发下，我们观察到铽的绿色发光，量子产率约为20%。
