Light emission of a polyfluorene derivative containing complexed europium ions
authors Turchetti, DA; Nolasco, MM; Szczerbowski, D; Carlos, LD; Akcelrud, LC
nationality International
journal PHYSICAL CHEMISTRY CHEMICAL PHYSICS
keywords ORGANIC-INORGANIC HYBRIDS; RARE-EARTH IONS; BETA-DIKETONATE COMPLEX; ENERGY-TRANSFER; PHOTOPHYSICAL PROPERTIES; CONJUGATED POLYMERS; PHOTOLUMINESCENT PROPERTIES; EFFICIENT SENSITIZATION; COORDINATION-COMPOUNDS; DIFFERENTIAL-OVERLAP
abstract The photophysical properties of a new alternating copolymer containing fluorene, terpyridine, and complexed sites with trivalent europium (Eu3+) ions (laPPS66Eu) were investigated, using the non-complexed backbone (laPPS66) and a low molecular weight compound of similar chemical structure of the ligand/Eu3+ site (laPPS66M) as a model compound. The analogous gadolinium complex (laPPS66Gd) was aka synthesized to determine the triplet state of the complex. H-1 and C-13 nuclear magnetic resonance (NMR) analysis, Fourier transform infrared (FT-IR) spectroscopy, inductively coupled plasma optical emission spectroscopy (ICP-OES), elemental analyses, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) characterized the chemical structure and thermal properties of the synthesized materials. A level of Eu3+ insertion of 37% (molar basis) in the polymer backbone was achieved. The photoluminescence studies were performed in the solid state showing the occurrence of polymer-to-Eu3+ energy transfer brought about by the spectral overlap between the absorption spectra of the Eu3+ complex and the emission of the polymer backbone. A detailed theoretical photoluminescence study performed using time-dependent DET (TD-DFT) calculations and the recenty developed LUMPAC luminescence package is aka presented. The high accuracy of the theoretical calculations was achieved on comparison with the experimental values. Aiming at a deeper leveE of understanding of the photoluminescence process, the ligand-to-Eu3+ intramolecular energy transfer and back-transfer rates were predicted. The complexed materials showed a dominant pathway involving the energy transfer between the triplet of the dbm (dibenzoyErnethane) ligand and the D-5(1) and D-5(0) Eu3+ levels.
publisher ROYAL SOC CHEMISTRY
issn 1463-9076
year published 2015
volume 17
issue 39
beginning page 26238
ending page 26248
digital object identifier (doi) 10.1039/c5cp03567h
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000362291300063
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journal analysis (jcr 2017):
journal impact factor 3.906
5 year journal impact factor 4.224
category normalized journal impact factor percentile 73.037
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