Eu(III) and Gd(III) complexes with pirazyne-2-carboxylic acid: luminescence and modelling of the structure and energy transfer process

Luminescent properties of yttrium diphenylphosphinate activated by europium

“…However, the average quantum yield of Eu 3+ emission in the yttrium matrices is 60% (Table 3). This value is relatively high for lanthanoid complexes [1,11,12] and no concentration quenching was observed. This data, together with the lifetime values observed, suggest that the activators are evenly distributed throughout the host matrix, in a somewhat clear evidence of an overall polymeric structure for the new materials.…”

“…The search for efficient light-converting devices, based in rare earth coordination compounds, has been a fascinating area of interest in inorganic chemistry, due to their potential use as luminescent materials [1]. In this area, the importance of the lanthanoid ions luminescence is due to their unique long lifetime and line-like emission bands, characteristic of the behavior of their 4f states in the presence of a chemical environment [2].…”

Photoluminescence study of new lanthanide complexes with benzeneseleninic acids

“…We interpret this difference as a result of a coordination geometry with a symmetry closer to a regular cube than in the case of complexes with b-diketones ligands in eight-fold coordination. However, the intensity parameters here obtained are very close to the values obtained for complexes with carboxylic acids (Table 2) [31,32], indicating similar coordination geometries and similar polarization of the chemical environment for both cases. Table 3 …”

Synthesis, characterization and spectroscopic study of Eu(III) complexes with 3-aminopicolinic acid derivatives

“…(5) Z p and Z j are normalized populations of levels p and j, respectively. Common values have been assigned to some non-radiative rates between excited states of the ligands and between excited 4f states [20,21]. The composition of the molecular orbitals of the ligand triplet state, also predicted for the Eu(3-NHCORpicNO) 3 Á 3H 2 O complex, was used to calculate the distance R L from the Eu(III) ion to the region of the ligand molecule where the donor (or acceptor) state is located [22].…”