Preparation and Photoluminescent Properties of new Europium Complexes with 2'-Hydroxy- 3-(p- methoxyphenyl) Propiophenone (original) (raw)
Related papers
Journal of Luminescence, 2008
p-type Li-doped ZnMgO thin films were prepared on glass substrates by pulsed laser deposition. The growth temperature varied from 400 to 650°C. All the films were highly c-axis oriented according to X-ray diffraction patterns. Hall-effect measurements indicated that the Li-doped ZnMgO film grown above 600°C failed in converting to p-type conduction. The film grown at 550°C showed the lowest resistivity of 10Ω cm with a hole concentration of 2.5 × 10 18 cm − 3 . Temperature-dependent PL measurements revealed a dominant emission at 3.52eV up to RT, which may be assigned as exciton bound to neutral-acceptor (A 0 X) due to Li-doping. The Li acceptor activation energy in ZnMgO thin film was determined to be 135 ± 20meV.
Molecules
This paper reports the synthesis, structure, photophysical, and optoelectronic properties of five eight-coordinate Europium(III) ternary complexes, namely, [Eu(hth)3(L)2], bearing 4,4,5,5,6,6,6-heptafluoro-1-(2-thienyl)-1,3-hexanedione (hth) as a sensitizer and L = H2O (1), dpso (diphenyl sulphoxide, 2), dpsoCH3 (4,4′-dimethyl diphenyl sulfoxide, 3), dpsoCl (bis(4-chlorophenyl)sulphoxide, 4), and tppo (triphenylphosphine oxide, 5) as co-ligands. The NMR and the crystal structure analysis confirmed the eight-coordinate structures of the complexes in solution and in a solid state. Upon UV-excitation on the absorption band of the β-diketonate ligand hth, all complexes showed the characteristic bright red luminescence of the Europium ion. The tppo derivative (5) displayed the highest quantum yield (up to 66%). As a result, an organic light-emitting device, OLED, was fabricated with a multi-layered structure—ITO/MoO3/mCP/SF3PO:[complex 5] (10%)/TPBi:[complex 5] (10%)/TmPyPB/LiF/Al—using ...
The photoluminescent and electroluminescent properties of a new Europium complex
Journal of Luminescence, 2007
A new rare earth (RE) complex Eu(BSA) 3 phen was synthesized. A narrow emission band from a device structure of ITO/PVK: RE complex/LiF/Al was observed, in which poly N-vinylcarbazole (PVK) was used to improve the film-forming and hole-transporting property of the Eu(BSA) 3 phen. Excitation, photoluminescence (PL) and electroluminescence (EL) characteristics of the device were studied and an energy transfer from PVK to europium complex was proposed. Effects of doping ratios of Eu(BSA) 3 phen on the device performance were also studied. r
EPJ Applied Physics, 2020
In the present work, the Europium doped Zinc Oxide (ZnO: Eu) thin films were elaborated using spray pyrolysis technique. We are interested in investigating the structural properties, photoluminescence (PL) and third harmonic generation (THG) of the elaborated films. The structural properties of as-prepared thin films were characterized by X-ray diffraction (XRD). It confirms that all deposited thin films of Europium doped Zinc Oxide are crystallized in the hexagonal wurtzite structure. Both undoped and doped europium thin films show strong preferred c-axis orientation. Photoluminescence (PL) emission from Europium doped Zinc Oxide thin films, under excitation by 266 nm, shows characteristic transitions of Europium (
New europium complexes and their use in red light-emitting diodes and vapoluminescent sensors
Journal of Information Display
Three novel trivalent europium [Eu(III)] complexes-Eu(DBM) 3 Phen-Ph-Ph, Eu(DBM) 3 Phen-mCF 3-Ph, and Eu(DBM) 3 Phen-pCF 3-Ph-were designed, synthesized, and characterized using various spectroscopic methods. Then their photophysical characteristics were investigated. The Eu complexes in the solid phase showed a pure red emission (due to the electric dipole transitions of the Eu 3+ ion). In a solution, they had multiple emissions due to their ligand contribution. The solvatochromism studies revealed that the Eu(III) complexes in the methanol and DMSO solutions had both metal ion and ligand emissions with similar intensities, which yielded a white emission. Of all the Eu(III) complexes, Eu(DBM) 3 Phen-mCF 3-Ph showed the best quantum yield. In addition, the fluorinated mCF 3 ligand had an unusually high lifetime value. Its remarkable linear decrease in luminescence intensity with increasing temperature opens a new window for its use as a sensitive temperature sensor at the 30-80°C range. The CIE color coordinates of the fabricated red LEDs (InGaN) are very close to the standard NTSC CIE color coordinates for bright red emissions, and the color purity as well as the LER values of the fabricated red LEDs are also very good. The Eu(III) complexes exhibited on-off photoluminescence switching via the vapoluminescent process and responded best to the acid-base (HCl-NH 3) vapors. All these features suggest that the synthesized Eu(III) complexes are efficient candidates for red-emitting LEDs and vapoluminescent sensors. Organic chromophores, which are phenanthro-imidazole ligands based on fluorinated moieties coordinated with Eu(III) metal ions, very efficiently facilitate energy transfer from the ligand to the Eu(III) ion. The CIE color coordinates of the complexes showed a bright pure red emission, with x = 0.66 and y = 0.33 (612 nm). The fabricated light-emitting diode (LED) showed superior color quality and the complexes showed on-off-on luminescence behavior after exposure to the acid-base vapors.
Bulletin of Materials Science, 2008
A new aryl amide type bridging ligand 1,4-bis{[(2 -benzylaminoformyl)phenoxyl]ethoxyl}benzene (L) and its complexes with lanthanide ions (Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er) were synthesized and characterized by elemental analysis, infrared spectra and electronic spectra. At the same time, the luminescent properties of the Sm, Eu, Tb and Dy complexes in solid state and the Tb complex in solvents were also investigated. At room temperature, these four complexes exhibited characteristic luminescence emissions of the central metal ions under UV light excitation and could be significant in the field of supramolecular photonic devices.
Journal of Luminescence, 2012
ZnO thin films were grown on single-crystal g-LiAlO 2 (LAO) and sapphire (0 0 0 1) substrate by pulsed laser deposition (PLD). The structural, optical and electrical properties of ZnO films were investigated. The results show that LAO is more suitable for fabricating ZnO films than sapphire substrate and the highest-quality ZnO film was attained on LAO at the substrate temperature of 550 1C. However, when the substrate temperature rises to 700 1C, lithium would diffuse from the substrate (LAO) into ZnO film which makes ZnO film on LAO becomes polycrystalline without preferred orientation, the stress in ZnO film increases dominantly and the resistivity of the film decreases exponentially. r
A series of lanthanide coordination compounds LnL 3 , LnL 3 Phen, and LnL 3 Dipy with aryl-functionalised carbacylamidophosphate (CAPh) ligand N-(diphenylphosphoryl)benzamide (HL= PhC(O)N(H)P(O)Ph 2) were synthesized for luminescent thin films producing. The bulky organic ligands provide a hydrophobic shell around Ln III ion leading to highly luminescent terbium and europium complexes with long-lived emission. The thin films of the complexes were obtained by spin coating and, for the first time, by vacuum evaporation. The films exhibit an intensive monochromatic photoemission with decay times equal to 0.78-1.34 ms.
Photo- and electroluminescent properties europium complexes using bistriazole ligands
Synthetic Metals, 2013
Luminescent properties of two heteroleptic dibenzoylmethanate europium(III) complexes with 1,3-bis(5-pyridin-2-yl-1,2,4-triazol-3-yl)propane (H 2 L 1) and 1,4-bis(5-pyridin-2-yl-1,2,4-triazol-3yl)butane (H 2 L 2) as ancillary ligands are described. The two double-layer-type electroluminescent cells with the structures: (1) ITO/NPB(40 nm)/Eu(DBM) 2 HL 1 (40 nm)/LiF (1 nm)/Al (100 nm) and (2) ITO/NPB(40 nm)/Eu(DBM) 2 HL 2 (40 nm)/LiF (1 nm)/Al (100 nm) emit red light originating from the europium complexes. The device 2 gives the maximum brightness of 455 cd/m 2 at 19.2 V.
Dyes and Pigments, 2012
MgO) x (ZnO) 1Àx materials have been synthesized using mesoporous carbon as template. By increasing the MgO content in the materials greater than 25%, the (MgO) x (ZnO) 1Àx materials began to form the mesoporous structure. Pore size distribution curves indicated that the BJH pore diameter decreased with increasing MgO content. In photoluminescence spectra, all the samples except pure ZnO showed both the band-edge emission and the deep-level emission (green band). It was interesting to note that the UV emission peak energy (E UV ) had a red-shift of about 48 meV at the low MgO content range of 0-25%, while when the MgO content varied from 25 to 75%, the E UV displayed a blue-shift of about 36 meV to the higher energy direction. The optical band gap (E g ) of the (MgO) x (ZnO) 1Àx calculated from the absorption spectra was far smaller than that in literature, and this may be related to the formation of mesoporous structure. #