Incorporation of europium III complex into nanoparticles and films obtained by the Sol-Gel methodology

Abstract

The sol-gel process is very effective for the preparation of new materials with potential applications in optics, sensors, catalyst supports, coatings, and specialty inorganic polymers that can be used as hosts for the accommodation of organic molecules. The low temperature employed in the process is the main advantage of this methodology. In this work, the europium (III) complex with 1,10-phenantroline was prepared, and this luminescent complex was incorporated into silica nanoparticles and films by the sol-gel process. The nanoparticles were obtained by the modified Stöber methodology. The films were obtained by the dip-coating technique, at different deposition rates and numbers of layers. The nanoparticles and films were characterized by photoluminescence, thermal analysis, and Raman and infrared spectroscopies. Characterization revealed that the europium (III) complex was not affected upon incorporation into the nanoparticles and films, opening a new field for the application of these materials

Effect of varying lanthanide local coordination sphere on luminescence properties illustrated by selected inorganic and organic rare earth complexes synthesized in sol–gel host glasses

“…The intensification and splitting of the peaks accompanying chelation in Fig. 7 have been pointed out by many authors [51,66]. In this case, the emission peaks are split into more than one band; this is attributed to the shielding effect of bulky chelating ligand.…”

Unveiling the Effects of Rare-Earth Substitutions on the Structure, Mechanical, Optical, and Imaging Features of ZrO2 for Biomedical Applications

“…This typical transition is obvious for 10 and 20 mol % of Tb 3+ additions, while the apparent broadening and the quenching effect alongside the detection of weak band at ∼468 nm typical of 5 D 3 – 7 F J ( J = 5, 4) transitions were observed for high Tb 3+ content beyond 40 mol %. , Excitation of Gd 3+ systems at 285 nm (Figure d) exhibited strong band ∼490–520 nm specific of 4 f 7 → 4 f 6 transition, and moreover the weak emission of Gd 3+ is also determined at 445–455 and 460–475 nm. , All the Eu 3+ compositions excited at 393 nm (Figure e) ensured red emission at 590 nm ( 5 D 0 → 7 F 1 ), 606 nm ( 5 D 0 → 7 F 2 ), 633 and ∼645–665 nm ( 5 D 0 → 7 F 3 ), and 715 nm ( 5 D 0 → 7 F 4 ). A gradual concentration quenching is also witnessed for high Eu 3+ contents for the dominant 715 nm peak. − Excitation of Nd 3+ added compositions at 795 nm (Figure f) unveiled bands at 1015, 1068, 1082, and 1113 nm characteristic of 4 F 3/2 → 4 I 11/2 transitions alongside the bands at 1137, 1178, 1194, and 1267 nm for 4 F 3/2 → 4 I 13/2 transitions. Ten and 20 mol % of Nd 3+ exhibited more intense bands at 1068 and 1194 nm, while the Nd 3+ additions at the higher side enunciate strong band at 1194 nm typical of Nd 3+ transition in the NIR region. , …”

Lithium lanthanum titanate perovskite ionic conductor: Influence of europium doping on structural and optical properties

“…Nevertheless, the ligand field (odd) associated with the chemical environment where the Eu 3+ ion is located has the property of mixing levels of opposite parity settings, relaxing the selection rules for the electric dipole transitions. This fact is reflected in all 5 D 0 → 7 F J (0-J) transitions, being more noticeable in the transition 5 D 0 → 7 F 2 (0−2), which is known to be hypersensitive; and excluding 5 D 0 → 7 F 1 (0−1) which is a magnetic transition [24][25][26][27][28][29][30].…”

“…The electronic transitions located in their luminescent centers indicate the ionic properties of the matrix in which it is contained as well as the interaction Eu 3+ /matrix. Hence, the use of lanthanides as structural probe provides information regarding the symmetry of the crystallographic sites, the nature of the chemical bonds (covalent grade), the energy transfer processes and the long range symmetry effect of the spectroscopic properties of the luminescent centers [24][25][26][27][28][29][30][31].…”