A novel europium(iii) complex with versatility in excitation ranging from infrared to ultraviolet

Shi, Meng; Ding, Cairong; Dong, Jian‐Wen; Wang, He-Zhou; Tian, Yupeng; Hu, Zhangjun

doi:10.1039/b900165d

Cited by 37 publications

(15 citation statements)

References 31 publications

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“…[4][5][6][7] Europium(III) complexes with b-diketonate ligands have attracted considerable attention because of their chemical stability, ease of preparation and noticeable emission properties due to the high energy transfer rate from ligands to central Eu 3+ ions (known as the antenna effect). [8][9][10] It was reported that LEDs using europium(III)-b-diketonate complexes as red phosphors could emit highly monochromatic red light with half peak bandwidths of only 5-10 nm resulting from the 5 D 0 -7 F 2 electronic transitions. 6,7,11 However, high-energy oscillators in ligands, such as C-H and O-H bonds (typically found in b-diketonate ligands), can quench the excited states nonradiatively and shorten the excited-state lifetimes because their energy levels of multiphonon oscillation-coupling are just close to the 5 D 0 state of the Eu 3+ ion.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photophysical properties of europium(iii)–β-diketonate complexes applied in LEDs

Shao

Zhang

et al. 2014

Phys. Chem. Chem. Phys.

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Six β-diketonate ligands were used to prepare the corresponding antenna europium(III) ternary complexes using 1,10-phenanthroline as an ancillary ligand. All the complexes exhibited high decomposition temperatures. Photophysical properties such as FT-IR spectra, UV-Vis absorption spectra, excitation and emission spectra, relative luminescent intensity ratios, luminescence decay curves and quantum yields based on the complexes were systematically studied and compared with each other. The energy-transfer mechanism was proposed as a ligand-sensitized luminescence process. Bright red light-emitting diodes (LEDs) were then fabricated by coating the complexes onto 395 nm-emitting InGaN chips. The light emission from the InGaN chips could be completely absorbed in the spectra of LEDs. The Commission International de I'Eclairage (CIE) chromaticity coordinates are close to the National Television Standard Committee (NTSC) standard value for the red color. All these findings indicate that these Eu(III) complexes are promising red phosphors for fabrication of near UV-based white LEDs.

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Section: Introductionmentioning

confidence: 99%

Synthesis and photophysical properties of europium(iii)–β-diketonate complexes applied in LEDs

Shao

Zhang

et al. 2014

Phys. Chem. Chem. Phys.

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“…1) cation that extends the sensitization wavelength into the visible. 25 Recently Maury et al sensitized an ytterbium complex using an elegant macrocyclic ligand based on the triaza-cyclononane platform (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Two-photon sensitized visible and near-IR luminescence of lanthanide complexes using a fluorene-based donor–π-acceptor diketonate

et al. 2014

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A fluorene-based donor-acceptor ligand was successfully employed to sensitize visible and near-IR emitting lanthanide centers. The ligand construct is based on a donor-π-acceptor architecture with diphenylamino acting as the donor and a fluorenyl π bridge derivatized with a trifluoroacetonate moiety acting as both a strong acceptor and the classic bidentate scaffold for complexing metals. (1)H NMR analysis in the polar solvents THF and CDCl3 revealed the enolic form of the diketone dominant in solution equilibria at room temperature. This preferred cis-enol form binds strongly to the lanthanide(III) ions (Ln = Eu, Sm, Dy, Tb, Yb, Nd, Er, and Gd) in the presence of phenanthroline affording the resulting ternary tris(diketonates) complexes with 1,10-phenanthroline. Detailed characterization of these complexes was conducted, with particular emphasis on linear and nonlinear photophysical properties. Steady-state and time-resolved emission spectroscopy and overall photoluminescence quantum yield (PLQY) measurements were performed on all the complexes. Sizeable visible and near-IR efficiency for europium (room temperature, visible), samarium (low temperature, visible) and ytterbium, neodymium and erbium (room temperature, near-IR) was displayed, with long luminescent lifetimes for the europium and samarium complexes of 85 and 70 μs, respectively Measurement of the luminescence decay for the Yb complex at 976 nm, Nd complex at 874 nm, and Er complex at 1335 nm yielded mono-exponential decay curves, with lifetimes of ~13 μs, ~1.6 μs, and ~2.5 μs, respectively, inferring that the emission was generated by a single species. In addition, fluorescence anisotropy and two-photon absorption (2PA) spectra (via Z-scan) were obtained for the ligand and europium complex, revealing a maximum 2PA cross section of 340 GM for the latter upon excitation at 760 nm. A quadratic relationship was found by varying laser excitation power vs. luminescence intensity of the europium complex, confirming sensitization via two-photon excitation.

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“…[1][2][3][4][5] The superior luminescent properties of europium complexes are characterized by the narrow-line emission of Eu 3 + in the red-light region, with acceptable transparence for many biosamples, large Stokes shifts, and long luminescence lifetimes. [3][4][5] Remarkable progresses have been achieved in the design and synthesis of Eu 3 + complexes with excellent two-photon excitation (TPE) luminescence properties, 4,[6][7][8][9][10][11][12][13][14][15][16][17] and several ones have been successfully applied in the multi-photon-excitation bio-imaging of cells. 8,9,18 In comparison with free Eu 3 + complex molecules, bionanoprobes prepared by encapsulating proper Eu 3 + complexes into water-dispersible and biocompatible nanoparticles possess the additional benefits of markedly enhanced luminescent brightness, chemical stability and photostability, as well as lower cytotoxicity.…”

Section: Introductionmentioning

confidence: 99%

Nanoprobes with Enhanced Two-Photon-Sensitized Eu<sup>3+</sup> Luminescence Properties for Live Cell Imaging

Xiao-Yi¹,

北京分子科学国家实验室²,

Guang-Sheng³

et al. 2012

Acta Physico-Chimica Sinica

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Luminescent nanospheres (EuPHS, dav=45 nm) containing 40% (w) of Eu(tta)3dpbt (tta= thenoyltrifluoroacetonato;dpbt=2-(N,N-diethylanilin-4-yl)-4,6-bis(3,5-dimethylpyrazol-1-yl)-1,3,5-triazine) were prepared by encapsulating Eu(tta)3dpbt in a hybrid matrix formed in situ from poly(styrene-co-methyl methacrylate), octyltrimethoxysilane, and poly(octylsiloxane). The EuPHS are promising luminescent markers for bioanalysis because of their good dispersibility in aqueous solutions, high photostability, low cytotoxicity, and bright Eu 3+ luminescence under excitation at long wavelengths. EuPHS exhibited excellent visible light-sensitized and near-infrared two-photon-sensitized Eu 3 + luminescence properties, with a visible-light excitation peak at 415 nm and an excitation window extending up to 475 nm. The quantum yield for Eu 3 + luminescence was 0.31 (λex=415 nm, T=23 °C), and the two-photon excitation (TPE) action cross section was 5.0×10 5 GM (1 GM=10 -50 cm 4 •s•photon -1 •particle -1 ) at 830 nm. Bionanoprobes prepared 2480 FU Xiao-Yi et al.: Two-Photon-Sensitized Eu 3+ Luminescence Nanoprobes for Live Cell ImagingNo.10 by adsorbing transferrin on the surfaces of EuPHS were successfully applied in target-specific labeling and two-photon-excitation imaging of live HeLa cells.

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A novel europium(iii) complex with versatility in excitation ranging from infrared to ultraviolet

Cited by 37 publications

References 31 publications

Synthesis and photophysical properties of europium(iii)–β-diketonate complexes applied in LEDs

Synthesis and photophysical properties of europium(iii)–β-diketonate complexes applied in LEDs

Two-photon sensitized visible and near-IR luminescence of lanthanide complexes using a fluorene-based donor–π-acceptor diketonate

Nanoprobes with Enhanced Two-Photon-Sensitized Eu<sup>3+</sup> Luminescence Properties for Live Cell Imaging

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