Synthesis, structural characterization and luminescent properties of a novel europium ternary complex Eu(2-A-4-CBA)3phen

Polyvinylpyrrolidone Nanofibers Encapsulating an Anhydrous Preparation of Fluorescent SiO2–Tb3+ Nanoparticles

“…These bands are attributed to the 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 transitions of Tb 3+ ions. The 5 D 4 → 7 F 5 transition at the emission wavelength of 548 nm is the hypersensitive transition with strongest fluorescence intensity [17,18,19]. The SiO 2 –Tb 3+ hybrid nanoparticles have stronger luminescence than the corresponding pure Tb(acac) 3 phen complex; the electric dipole transition and its corresponding intense emission at 548 nm aree significantly increased [20].…”

“…The Tb(acac) 3 phen complex powder shows a sharp and strong crystalline peak at the diffraction angle of 2θ = 10.36 (Figure 4d). Strong crystalline peaks are also observed at 2θ = 9.360, 11.460, 12.420, and 13.460, indicating that both Tb(acac) 3 phen and SiO 2 –Tb 3+ hybrid nanoparticles are highly crystalline and that the crystals are relatively regular [18,23]. The Tb(acac) 3 phen complex and SiO 2 –Tb 3+ hybrid nanoparticles have the same crystalline peak positions, indicating that the encapsulation of Tb(acac) 3 phen complexes in silica nanoparticles does not change the crystal structure of the Tb(acac) 3 phen complex.…”

“…SiO 2 –Tb 3+ /PVP nanofibers show strong green luminescence and exhibit Tb 3+ corresponding to the characteristic transition of 5 D 4 – 7 F J (J = 6, 5, 4, 3). The green emission at 548 nm from the electronic dipole transition 5 D 4 – 7 F 5 possesses the strongest intensity, indicating that the position of Tb 3+ is in an environment without reverse symmetry [24]. Strong 5 D 4 – 7 F 5 peak intensity indicates a highly polarized chemical environment around the Tb 3+ ion and is responsible for producing bright-green light upon 325-nm ultraviolet radiation.…”

Synthesis and Characterization of Novel Silylated Sm³⁺and Eu³⁺ Complexes Incorporated into Mesoporous and Dense Silica Nanoparticles

“…[13] Eu 3+ complexes, in general, exhibit high quantum efficiency and a versatile coordination environment. [16] Due to these properties, we used this ion in this work. The most intense and dominant transition in the emission spectrum for the Eu 3+ ion is 5 D0→ 7 F2 (613 nm).…”

“…[14] If the 5 D0→ 7 F2 transition is much more intense than 5 D0→ 7 F1, then the complex will emit pure red light. [16] Figure 2. Luminescence spectra (excitation -left, and emission -right) of the Eu(tta-Si)3(phen), Eu(phen-Si)3(tta), and Eu(tta-Si)2(phen-Si)2 complexes, acquired with slit widths exc/em = 2/2 mm; increment = 1 nm; speed = 0.1 s.…”