Towards a Correlation between Structural, Magnetic, and Luminescence Properties of CeF 3 :Tb 3+ Nanocrystals.

In this study, we report on the structural, magnetic, and optical properties of Tb ³⁺ -doped CeF ₃ 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 Ce _0.75 F ₃ 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 ³⁺ and Tb ³⁺ 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 ³⁺ ions, we observed Tb ³⁺ green luminescence with a quantum yield of about 20%.