Determination of contributions of various molecular groups to nonradiative deactivation of electronic excitation energy in β-diketonate complexes of ytterbium(III)

Цвирко, М. П.; Мешкова, С. Б.; Venchikov, V. Ya.; Topilova, Z. M.; Bol'shoi, D. V.

doi:10.1134/1.1374653

Cited by 43 publications

(45 citation statements)

References 5 publications

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“…For example, the emission quantum yield for the model compound [Yb(dbm) 3 phen] was reported to be 5.9 ϫ 10 -3 in toluene solution, [37] -3 and a ligand-sensitization efficiency of 47 % (again, a lower limit estimate). This difference may indicate that in dmso solution the average metalligand bonds are longer than in the solid state probably due to a partial dissociation of the 1,3-diketonato ligand [38] which leads to a diminished energy-transfer efficiency.…”

Section: Photophysical Propertiesmentioning

confidence: 98%

Visible‐Light Excitation of Infrared Lanthanide Luminescence via Intra‐Ligand Charge‐Transfer State in 1,3‐Diketonates Containing Push‐Pull Chromophores

et al. 2008

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Section: Photophysical Propertiesmentioning

confidence: 98%

Visible‐Light Excitation of Infrared Lanthanide Luminescence via Intra‐Ligand Charge‐Transfer State in 1,3‐Diketonates Containing Push‐Pull Chromophores

et al. 2008

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“…The subscripts 'x' and 'r' refer to the sample and reference. In the visible region, a methanol solution of cresyl violet perchlorate was used as the reference 17 18 (Φ r = 0.0035). The estimated error for these measurements is ±15%.…”

Section: General Photophysicsmentioning

confidence: 99%

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates – part II

et al. 2013

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The synthesis, X-ray structures and photophysical properties of several new Ln(III) complexes with the dianion of pyrazine-2,6-dicarboxylic acid (H 2 PYZ) that demonstrate excellent stability and solubility in non-aqueous solution are reported, and compared to structurally analogous complexes derived from pyridine-2,6-dicarboxylic acid (H 2 DPA). The Eu(III) and Yb(III) complexes demonstrate efficient metal centered luminescence in the visible and Near Infra-Red (NIR) regions, respectively. Low temperature (77 K) phosphorescence measurements using the corresponding Gd(III) complex has allowed the photophysical properties of the sensitizer to be rationalized, together with corresponding TD-DFT studies for a model complex. Lastly, we have evaluated the sensitization efficiencies for these complexes, and have undertaken femtosecond transient absorption (TA) measurements in order to evaluate the relative importance of the intersystem crossing and energy transfer processes involved with sensitized Ln(III) emission via the antennae effect.

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“…13 The unmatched luminescent properties of β-diketonate compounds and materials are at the heart of a number of applications, ranging from analytical sensors, 14À16 emissive layers for organic light-emitting diodes (OLEDs), 17À19 including white-light production, 20,21 nonlinear optics, 22 as well as time-resolved bioanalyses 23 and bioimaging. 24,25 It is noteworthy that not only visible but also near-infrared luminescence 26,27 is efficiently sensitized in β-diketonate ternary complexes.…”

mentioning

confidence: 99%

Deciphering Three Beneficial Effects of 2,2′-Bipyridine-N,N′-Dioxide on the Luminescence Sensitization of Lanthanide(III) Hexafluoroacetylacetonate Ternary Complexes

et al. 2011

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Lanthanide hexafluoroacetylacetonate ternary complexes with 2,2 0 -bipyridine-N,N 0 -dioxide, [Ln(hfa) 3 (bpyO2)], were synthesized for Ln = Eu, Gd, Tb, and Lu and fully characterized by elemental, thermal, and mass-spectrometric analyses. The X-ray crystal structure of [Eu(hfa) 3 (bpyO2)] 3 0.5C 6 H 6 reveals an octa-coordinate metal ion lying in a severely distorted trigonal dodecahedron geometry; the EuÀO distances lie in the range 2.36À2.44 Å with no significant difference between hfa À and bpyO2. A detailed comparative photophysical investigation has been carried out to determine the exact influence of the introduction of bpyO2 in the inner coordination sphere of the metal ion in replacement of the two water molecules in [Ln(hfa) 3 (H 2 O) 2 ]. While this replacement is detrimental for Tb, it leads to a 15-fold increase in the overall quantum yield for Eu. This large improvement originates from (i) a better sensitization efficiency, the ancillary ligand being responsible for 3/4 of the energy transfer, (ii) elimination of nonradiative deactivation pathways through harmonics of OÀH vibrations, and (iii) reduction in the radiative lifetime. The latter influence is rarely documented, but it accounts here for a ≈25% increase in the intrinsic quantum yield, so that more attention should be given to this parameter when designing highly luminescent lanthanide complexes.

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Determination of contributions of various molecular groups to nonradiative deactivation of electronic excitation energy in β-diketonate complexes of ytterbium(III)

Cited by 43 publications

References 5 publications

Visible‐Light Excitation of Infrared Lanthanide Luminescence via Intra‐Ligand Charge‐Transfer State in 1,3‐Diketonates Containing Push‐Pull Chromophores

Visible‐Light Excitation of Infrared Lanthanide Luminescence via Intra‐Ligand Charge‐Transfer State in 1,3‐Diketonates Containing Push‐Pull Chromophores

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates – part II

Deciphering Three Beneficial Effects of 2,2′-Bipyridine-N,N′-Dioxide on the Luminescence Sensitization of Lanthanide(III) Hexafluoroacetylacetonate Ternary Complexes

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