Effect of Ceramic Formation on the Emission of Eu(3+) and Nd(3+) Ions in Double Perovskites

Herein, the structure, morphology, as well as optical properties of the powder and ceramic samples of Ba(2)MgWO(6) are presented. Powder samples were obtained by high temperature solid-state reaction, while, for the ceramics, the SPS technique under 50-MPa pressure was applied. The morphology of the investigated samples showed some agglomeration and grains with a submicron size of 490–492 µm. The theoretical density and relative density of ceramics were calculated using the Archimedes method. The influence of sample preparation on the position, shape, and character of the host, as well as dopants emission was investigated. Sample sintering enhances regular emission of WO(6) groups causing a blue shift of Ba(2)MgWO(6) emission. Nonetheless, under X-ray excitation, only the green emission of inversion WO(6) group was detected. For the ceramic doped with Eu(3+) ions, the emission of both host and dopant was detected. However, for the powder efficient host to activator energy, the transfer process occurred, and only the magnetic dipole emission of Eu(3+) was detected. The intensity of Nd(3+) ions of Ba(2)MgWO(6) powder sample is five times higher than for the ceramic. The sintering process reduces inversion defects and creates a highly symmetrical site of neodymium ions. The emission of Ba(2)MgWO(6):Nd(3+) consists of transitions from the (4)F(3/2) excited level to the (4)I(J) multiplet states with the dominance of the (4)F(3/2)→(4)I(11/2) one. The spectroscopic quality parameter and branching ratio of Nd(3+) emission are presented.