Highly Luminescent Poly(Methyl Methacrylate)-Incorporated Europium Complex Supported by a Carbazole-Based Fluorinated β-Diketonate Ligand and a 4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene Oxide Co-Ligand

Abstract

A novel efficient antenna complex of Eu(3+) [Eu(CPFHP)(3)(DDXPO)] supported by a highly fluorinated carbazole-substituted β-diketonate ligand, namely, 1-(9H-carbazol-2-yl)-4,4,5,5,5-pentafluoro-3-hydroxypent-2-en-1-one (CPFHP) and the 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene oxide (DDXPO) ancillary ligand, has been synthesized, structurally characterized, and its photoluminescent behavior examined. The single-crystal X-ray diffraction analysis of Eu(CPFHP)(3)(DDXPO) revealed that this complex is mononuclear, and that the central Eu(3+) ion is surrounded by eight oxygen atoms, six of which are provided by the three bidentate β-diketonate ligands. The remaining two oxygen atoms are furnished by the chelating phosphine oxide ligand. The coordination polyhedron is best described as that of a distorted square antiprism. The photophysical properties of Eu(CPFHP)(3)(DDXPO) benefit from adequate protection of the metal by the ligands with respect to non-radiative deactivation as well as an efficient ligand-to-metal energy transfer process which exceeds 66% in chloroform solution with a quantum yield of 47%. As an integral part of this work, the synthesis, characterization, and luminescent properties of poly(methyl methacrylate) (PMMA) polymer films doped with Eu(CPFHP)(3)(DDXPO) are also reported. The luminescent efficiencies of the doped films (photoluminescence quantum yields 79-84%) are dramatically enhanced in comparison with that of the precursor complex. The new luminescent PMMA-doped Eu(CPFHP)(3)(DDXPO) complex therefore shows considerable promise for polymer light-emitting diode and active polymer optical fiber applications.

Lanthanide coordination compounds with 1H-benzimidazole-2-carboxylic acid: syntheses, structures and spectroscopic properties

“…The luminescent intensity ratio of the ( 5 D 0 A 7 F 2 )/( 5 D 0 A 7 F 1 ) is 11.53, which indicates that compound 1 exhibits bright red light emission and the Eu 3+ ion in it is not located in a site with inversion center symmetry. 23 Fig . 12 summarizes the room-temperature excitation and emission spectra of Tb 3+ compound 2 in the solid state.…”

A Comprehensive Strategy to Boost the Quantum Yield of Luminescence of Europium Complexes

“…Thus, being able to design lanthanide complexes with larger quantum yields is highly desirable. Recent articles describe luminescent europium complexes with so far the largest values of quantum yield in chloroform solution of 81%11, and of 84%12. It is noteworthy that quantum yields of a given complex in polymethylmethacrylate (PMMA) are larger than the corresponding yields in solution11.…”

Poly-β-hydroxybutyrate sensitizing effect on the photophysical properties of environment friendly fluorescent films containing europium complex

“…3 illustrates in a schematic way how the Eu-complex is coordinated to the polymer backbone, and also exhibits that we successfully prepared transparent, flexible fluorescent films. Such interactions might stem from the donation of a pair of electrons from the carbonyl oxygen to the lanthanide ions [20].…”