Elaboration and optical study of BaCO₃ RE₂O₃ materials

Nanopowders of undoped and co-doped barium carbonate (BaCO¿) with (Eu³¿, Dy³¿) ions were prepared using the self-combustion method. In the first part, we investigated the effect of the europium ion concentration on the BaCO¿ matrix. The results obtained by XRD revealed that the samples consist of the orthorhombic BaCO¿ phase. We used the Judd-Offelt theory to calculate the Judd parameters and deduce the spontaneous emission probabilities, the lifetimes of the emitting levels and the quantum yield of the emission. The results showed that 1% Eu³¿-doped BaCO¿ exhibited favourable characteristics for laser emission in the red region. In the second part, we studied the spectroscopic properties of the Eu³¿/Dy³¿ ions in the matrix. The results obtained via electron paramagnetic resonance (EPR) confirm the presence of Eu³¿ and Dy³¿ ions in BaCO¿ through the resonance of their unpaired electrons. Analysis of the optical properties of rare-earth-doped BaCO¿ revealed the existence of energy transfer from Dy³¿ ions to Eu³¿ ions.

Pagina's: 88, Paperback, Our Knowledge Publishing