High-Resolution Optical Spectroscopy of Na3[Ln(dpa)3]·13H2O with Ln = Er3+, Tm3+, Yb3+

Reinhard, Christine; Güdel, Hans U.

doi:10.1021/ic0108484

Cited by 205 publications

(178 citation statements)

References 28 publications

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“…[17] Firstly, we recorded the ESI mass spectrum of [CrErCr(L1) 3 ](CF 3 SO 3 ) 9 in acetonitrile, and unambiguously confirmed that the kinetically inert ions [CrErCr(L1) 3 ] 9+ remain intact in solution for concentrations larger than 10 À4 m ( Figure S9). [12] provides similar upconversion luminescence, also with an exact quadratic dependence (I / P 1.98 (2) , Figure S10).…”

Section: +mentioning

confidence: 76%

Near‐Infrared→Visible Light Upconversion in a Molecular Trinuclear d–f–d Complex

et al. 2011

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Molecular nonlinear-optical (NLO) phenomena are currently being exploited for the design of visible emitting bioprobes with unprecedented properties that result from 1) the transparency of living tissues toward low-energy near-infrared (NIR) incident radiation and 2) the improved focusing of the light from an excitation laser beam within nanometric volumes.[1] Nonresonant multiphoton absorption produces a single emission during the irradiation; this emission corresponds to a multiple of the energy of the incident beam, as, for example, in second-harmonic generation (Figure 1 a), while resonant multiphoton absorption populates a real excited state of the chromophore, which relaxes and fluoresces with the same characteristics as if sensitized by a linear excitation process (Figure 1 b).[2] Beyond the optimization of polarizable push-pull p-aromatic molecules for NLO optical response, [2] and the related development of upconverted fluorescence signals in polyaromatic platforms produced by metal-sensitized triplet-triplet annihilation photochemistry, [3] Le Bozec, Maury, Andraud, and their respective co-workers demonstrated that trivalent lanthanide ions (Ln III ) may efficiently contribute to the polarization of coordinated aromatic ligands for resonant multiphoton absorption.[4] Moreover, the wealth of accessible long-lived metal-centered luminescent emissive levels can be exploited for two-photon-excited time-gated fluorescence analyses of biological tissues. [5] Interestingly, the existence of several real excited states located between the ground state and the target excited state of lanthanide acceptors opens novel perspectives for the operation of alternative sensitizing mechanisms that take advantage of these electronic relays for successive linear excitations by one (Figure 1 c) or several (Figure 1 d) moieties, thus leading to an excited-state absorption (ESA) process or sequential energy transfer upconversion (ETU), both of which are followed by luminescence.[6] Although they operate by different principles, that is, they involve real rather than virtual intermediate excited levels during the multiphoton absorption processes, two-photon upconversion fluorescence processes (Figure 1 c, d) can be considered as nonlinear because of the quadratic dependence of the efficiency (I) on the incident intensity of the excitation light (I / P 2 ). [4,6] Upconversion has been regularly reported for trivalent lanthanide cations doped into low-phonon inorganic matrices, [6] particularly for applications in bioanalyses, telecommunications, and solar energy conversion, [7] but it is still unknown in molecular erbium complexes [8] because of the high effective vibrational energy " hw eff % 2000 cm À1 that is typical of the molecular vibrations of organic ligands or of closely interacting solvent molecules, which result in efficient nonradiative relaxation of 4f-4f transitions.[9] In their seminal contribution dedicated to the search for upconversion fluorescence in the molecular complexes Na 3 [Ln(pyridine-2,6-dicarboxylat...

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Section: +mentioning

confidence: 76%

Near‐Infrared→Visible Light Upconversion in a Molecular Trinuclear d–f–d Complex

et al. 2011

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“…61 The total splitting value (Δ = 880 cm -1 for Yb(OSi(OtBu) Figure S32). [59][60][61][62][63] Finally the lifetime of the Yb(III) excited state was determined for all molecular complexes in solution and in the solid state (Table 5). In each case a perfect mono-exponential decay (eq 8) is observed with a lifetime between 5 and 5.8 µs (Figures S33 and S34).…”

Section: Molecular and Computational Modelsmentioning

confidence: 99%

Near-IR Two Photon Microscopy Imaging of Silica Nanoparticles Functionalized with Isolated Sensitized Yb(III) Centers

et al. 2014

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“…Esse processo de conversão de luz, chamado de efeito antena, envolve a absorção de radiação ultravioleta através dos ligantes, que atuam como "antenas", a transferência de energia do estado excitado do ligante para os níveis 4f do íon metálico e a emissão de radiação no visí-vel, característica do íon metálico 9 . Dentre os diversos ligantes orgânicos que são usados na sínte-se de compostos de coordenação de íons lantanídeos, diversos trabalhos têm sido desenvolvidos com ligantes tridentados derivados de ácidos dicarboxílicos [10][11][12][13][14][15] ; n=6-15 moléculas de água) foram preparados segundo procedimentos descritos na literatura 18,19 .…”

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Estudo espectroscópico de complexos de Eu3+, Tb3+ E Gd3+ com ligantes derivados de ácidos dicarboxílicos

Lima¹,

Malta²,

Júnior³

2005

Quím. Nova

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High-Resolution Optical Spectroscopy of Na₃[Ln(dpa)₃]·13H₂O with Ln = Er³⁺, Tm³⁺, Yb³⁺

Cited by 205 publications

References 28 publications

Near‐Infrared→Visible Light Upconversion in a Molecular Trinuclear d–f–d Complex

Near‐Infrared→Visible Light Upconversion in a Molecular Trinuclear d–f–d Complex

Near-IR Two Photon Microscopy Imaging of Silica Nanoparticles Functionalized with Isolated Sensitized Yb(III) Centers

Estudo espectroscópico de complexos de Eu3+, Tb3+ E Gd3+ com ligantes derivados de ácidos dicarboxílicos

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