Study of the Vibronic Transitions of Gd3+and Eu3+in Crystalline Materials and Glasses of the Same Composition

Spectroscopic and Structural Properties of β-Tricalcium Phosphates Ca9RE(PO4)7 (RE = Nd, Gd, Dy)

“…The strongest band is located at 32,133 cm −1 and corresponds to the 6 P 7/2 → 8 S 7/2 transition, and in particular is the zero-phonon line [45]. For Gd 3+ -based samples, vibronic lines may also be visible besides electronic transitions that are due to the interaction between 4f electrons of RE 3+ and lattice vibrations [16]. These are due to electron-phonon coupling and have a strong influence on the spectroscopic features of a given material; for these reasons, they are important from the application point of view and they can give information about the local structure of rare-earth-based compounds [16].…”

“…For Gd 3+ -based samples, vibronic lines may also be visible besides electronic transitions that are due to the interaction between 4f electrons of RE 3+ and lattice vibrations [16]. These are due to electron-phonon coupling and have a strong influence on the spectroscopic features of a given material; for these reasons, they are important from the application point of view and they can give information about the local structure of rare-earth-based compounds [16]. These cooperative transitions involve electronic transitions on the metal together with vibrational transitions in the coordinating environment [46], with a consequent mixing of opposite parity wavefunctions [47].…”

“…However, the characteristic transitions of Gd 3+ are strongly related to the surrounding host vibrations and are dependent on the nature of the lattice. Comparison of the emission bands with the vibrational modes occurring in the FTIR spectrum also made this ion a good optical probe with which to investigate the structural features of the host materials [9,16,17].…”

Direct Formation of Luminescent Fine Crystals Based on (Y,Eu)TiNbO6 Complete Solid Solution with High Crystallinity

“…One is the orange emission at 590 nm originated from the magnetic dipole allowed transition ( 5 D 0 → 7 F 1 ) and the other is the red emission at 612 nm corresponding to 5 D 0 → 7 F 2 that is electric dipole allowed transition. The red emission corresponding to the electric dipole allowed transition is hypersensitive to structure changes and is influenced by the local symmetry of the crystal field around the Eu 3+ ion …”

“…The red emission corresponding to the electric dipole allowed transition is hypersensitive to structure changes and is influenced by the local symmetry of the crystal field around the Eu 3+ ion. [11][12][13] Rare-earth titanium niobates (RETiNbO 6 , where RE is a rare earth) have been applied in several fields, e.g., phosphors, [14][15][16][17] dielectric resonators, [18][19][20] and miniature solidstate laser materials 21,22 because they possess unique, interesting, and potential properties. Up to now, the RETiNbO 6 niobates have been synthesized by means of some techniques, e.g., conventional solid-state reactions of oxides 16,23,24 and sol-gel combustion routes.…”