Multiphoton Excitation of Lanthanides

Lakowicz, Joseph R.; Piszczek, Grzegorz; Maliwal, Badri P.; Gryczyński, Ignacy

doi:10.1002/1439-7641(20010417)2:4<247::aid-cphc247>3.0.co;2-g

Cited by 46 publications

(30 citation statements)

References 39 publications

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“…The measured and calculated NLO parameters are usually limited to a single wavelength, thus the dispersions of these parameters are lacking, while wide-wavelength range measurements are essential for finding optimum wavelengths for multi-photon excitation of lanthanide luminescence. Additionally, since the 4f-4f photon transitions in lanthanides are two-photon allowed (Lakowicz et al 2001; Sztucki and Strek 1986), the NLO spectroscopy can provide additional information regarding the electronic structure of the investigated materials.…”

Section: Introductionmentioning

confidence: 99%

Morphology- and size-dependent spectroscopic properties of Eu3+-doped Gd2O3 colloidal nanocrystals

et al. 2014

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The synthesis, morphological characterization, and optical properties of colloidal, Eu(III) doped Gd2O3 nanoparticles with different sizes and shapes are presented. Utilizing wet chemical techniques and various synthesis routes, we were able to obtain spherical, nanodisk, nanotripod, and nanotriangle-like morphology of Gd2O3:Eu3+ nanoparticles. Various concentrations of Eu3+ ions in the crystal matrix of the nanoparticles were tested in order to establish the levels at which the concentration quenching effect is negligible. Based on the luminescence spectra, luminescence lifetimes and optical parameters, which were calculated using the simplified Judd–Ofelt theory, correlations between the Gd2O3 nanoparticles morphology and Eu3+ ions luminescence were established, and allowed to predict the theoretical maximum quantum efficiency to reach from 61 to 98 %. We have also discussed the impact of the crystal structure of Gd2O3 nanoparticles, as well as coordinating environment of luminescent ions located at the surface, on the emission spectra. With the use of a tunable femtosecond laser system and the Z-scan measurement technique, the values of the effective two-photon absorption cross-section in the wavelength range from 550 to 1,200 nm were also calculated. The nonlinear optical measurements revealed maximum multi-photon absorption in the wavelength range from 600 to 750 nm.

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Section: Introductionmentioning

confidence: 99%

Morphology- and size-dependent spectroscopic properties of Eu3+-doped Gd2O3 colloidal nanocrystals

et al. 2014

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“…Dimethyl 4‐[4‐(1‐Methyl‐1 H ‐imidazol‐5‐yl)‐1 H ‐1,2,3‐triazol‐1‐yl]pyridine‐2,6‐dicarboxylate (6): Compound 4 (synthesised as described in the literature,7 850 mg, 3.60 mmol, 1 equiv.) was dissolved in hot methanol (0.1 mol L –1 ) and 5‐ethynyl‐1‐methyl‐1 H ‐imidazole (440 μL, 4.32 mmol, 1.2 equiv.)…”

Section: Methodsmentioning

confidence: 99%

“…In order to compare the ability of such chromophores to sensitize Eu 3+ luminescence, overall OPA quantum yields have been determined experimentally by considering three europium(III) 4‐triazolyl‐DPA complexes [Eu 1 ], [Eu 2 ], [Eu 3 ], bearing phenyl, 1‐methylimidazolyl and N , N ‐dimethyl‐2‐ethanolammoniomethyl appendages, respectively, substituting the position 4 of the triazole group, and the derived monodisperse silica nanoparticles (NPs) embedding them. Recently, with a combination of the advantages of both lanthanide ions and two‐photon scanning microscopy, TPA sensitized luminescence of lanthanide complexes has attracted great attention,7–15 which is in favour of less‐harmful labelling and deep‐penetrating bioimaging applications. Accordingly, as stated above, the most popular sensitization mechanism is the “antenna effect”,3,4 i.e.…”

Section: Introductionmentioning

confidence: 99%

Two‐Photon Absorption Properties of Eu³⁺‐DPA‐Triazolyl Complexes and the Derived Silica Nanoparticles Embedding These Complexes

et al. 2014

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Several complexes and silica‐based nanohybrids of rare‐earth ions (Eu3+, Gd3+) have been synthesized from dimethyl 4‐azidopyridine‐2,6‐dicarboxylate (4) following the Click chemistry approach. A complete spectroscopic study indicates that such compounds exhibit strong sensitization by the antenna effect from both UV and NIR excitations. The Gd3+‐based materials show phosphorescence under ambient conditions, which originates from the lowest‐energy intra‐ligand triplets. Fine analysis of the NIR excitation spectra using time resolved photoluminescence spectroscopy (TRS) indicates that the spectral repartition of the triplet T1 state differs notably between the complexes and the NPs embedding the complexes. Moreover the dependence of Eu3+ luminescence vs. incident beam power in the NIR region diverges from pure quadratic dependence expected in the framework of the two‐photon absorption process. The results are discussed considering the occurrence of a direct singlet‐to‐triplet optical absorption transition (S0→T1) upon NIR excitation.

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“…The laser-induced fluorescence (LIF) technology has been developed for almost half a century and is now widely used in, e.g., food chemistry [15], medical diagnosis [16][17][18], microscopy [19], and remote sensing [20][21][22], especially in plant investigation. By illuminating the leaves of the plant, the LIF techniques were also used to classify the plant types and species [23], study the plant constituents [24], and investigate nutrient deficiencies in corn [25].…”

Section: Introductionmentioning

confidence: 99%

Tea classification and quality assessment using laser-induced fluorescence and chemometric evaluation

et al. 2012

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Laser-induced fluorescence was used to evaluate the classification and quality of Chinese oolong teas and jasmine teas. The fluorescence of four different types of Chinese oolong teas-Guangdong oolong, North Fujian oolong, South Fujian oolong, and Taiwan oolong was recorded and singular value decomposition was used to describe the autofluoresence of the tea samples. Linear discriminant analysis was used to train a predictive chemometric model and a leave-one-out methodology was used to classify the types and evaluate the quality of the tea samples. The predicted classification of the oolong teas and the grade of the jasmine teas were estimated using this method. The agreement between the grades evaluated by the tea experts and by the chemometric model shows the potential of this technique to be used for practical assessment of tea grades.

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Multiphoton Excitation of Lanthanides

Cited by 46 publications

References 39 publications

Morphology- and size-dependent spectroscopic properties of Eu3+-doped Gd2O3 colloidal nanocrystals

Morphology- and size-dependent spectroscopic properties of Eu3+-doped Gd2O3 colloidal nanocrystals

Two‐Photon Absorption Properties of Eu³⁺‐DPA‐Triazolyl Complexes and the Derived Silica Nanoparticles Embedding These Complexes

Tea classification and quality assessment using laser-induced fluorescence and chemometric evaluation

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Multiphoton Excitation of Lanthanides

Cited by 46 publications

References 39 publications

Morphology- and size-dependent spectroscopic properties of Eu3+-doped Gd2O3 colloidal nanocrystals

Morphology- and size-dependent spectroscopic properties of Eu3+-doped Gd2O3 colloidal nanocrystals

Two‐Photon Absorption Properties of Eu3+‐DPA‐Triazolyl Complexes and the Derived Silica Nanoparticles Embedding These Complexes

Tea classification and quality assessment using laser-induced fluorescence and chemometric evaluation

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Two‐Photon Absorption Properties of Eu³⁺‐DPA‐Triazolyl Complexes and the Derived Silica Nanoparticles Embedding These Complexes