Near-infrared luminescent polymer thin films containing Yb(III) complex and photosensitized dye

Kishimoto, Shin-ichiro; Tanaka, Atsushi; Hasegawa, Yasuchika; Kawai, Tsuyoshi

doi:10.1016/j.tsf.2008.09.027

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Quantum yield (QY) values of Yb(L 1 )(HL 1 ) and Yb(L 2 )(HL 2 ) achieved in powders are 0.5 ± 0.2 and 0.9 ± 0.2%, correspondingly (Table ). Although these values are quite high for NIR luminescence, as the typical values of NIR QY do not exceed 1% with few exceptions, ,,− the obtained QY values are lower than QY values of the ytterbium complexes with the H 2 L ligand that reached 1.4% . In the case of Yb(L 1 )(HL 1 ), such a decrease can be connected with the presence of the −OH group in the ligand structure, which is well known as a luminescence quencher. ,,,− The decrease of the quantum yield value of Yb(L 2 )(HL 2 ) cannot be connected with vibrational quenching, as it is a temperature-dependent process, and the luminescence intensity of Yb(L 2 )(HL 2 ) absolutely does not depend on temperature (Figure ).…”

Section: Resultsmentioning

confidence: 89%

Lanthanide Complexes with 2-(Tosylamino)-benzylidene-N-(aryloyl)hydrazones: Universal Luminescent Materials

et al. 2019

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Lanthanide complexes Ln(L 1 )(HL 1 ) (Ln = Lu, Yb, Er, Gd, Eu, Sm) and Ln(L 2 )(HL 2 ) (Ln = Lu, Yb, Gd, Eu) with 2-(tosylamino)-benzylidene-N-(aryloyl)hydrazones (H 2 L 1 , aryloyl = 2-hydroxybenzoyl; H 2 L 2 , aryloyl = isonicotinoyl) were obtained with the aim to explore them as new luminescent materials. They were found to form monomeric species independently on the aryloyl group, and their crystal structures were determined from single-crystal Xray data (Yb(L 2 )(HL 2 )•0.5(C 2 H 5 OH)), as well as from powder X-ray data by Rietveld refinement (Eu(L 1 )(HL 1 )). Ytterbium complexes exhibited intense luminescence, which allowed using them in host-free organic light-emitting diodes, which demonstrated remarkable efficiency of near infrared electroluminescence (50 μW/W) at low voltage (5 V). The special mechanism of europium luminescence quenching allowed using europium complexes as luminescent thermometers, which demonstrated very high sensitivity up to 12%/K. The theory of luminescence thermometry based on a three-level system was proposed, which allowed predicting sensitivity with high accuracy (error within 20%).

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Section: Resultsmentioning

confidence: 89%

Lanthanide Complexes with 2-(Tosylamino)-benzylidene-N-(aryloyl)hydrazones: Universal Luminescent Materials

et al. 2019

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“…Polymethylmethacrylate (PMMA) is a widespread polymer which easily forms thin films, thus it is often used for designing various optical materials. For instance, the DIP (dipyridophenazine) adduct of Yb III bis(perfluoromethanesulfonyl)imide salt, Yb(24a) 3 (H 2 O) 8 (DIP) (Scheme 4) displays overall quantum yields of 0.18 and 0.26% when inserted into PMMA or PMMA/DMSO thin films respectively; these figures are enhanced to 0.72-0.73% upon annealing the films at 80 1C during 1 h, 140 but they remain modest (see Table 4 for comparison). Similarly, the TPPO (triphenylphosphine oxide) adduct of Er III pentafluorobenzoate co-polymerized with PMMA displays a modest intrinsic yield of 0.12% (t rad from JO parameters = 12.66 ms).…”

Section: Extended Structuresmentioning

confidence: 99%

Lanthanide luminescence for functional materials and bio-sciences

2010

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Recent startling interest for lanthanide luminescence is stimulated by the continuously expanding need for luminescent materials meeting the stringent requirements of telecommunication, lighting, electroluminescent devices, (bio-)analytical sensors and bio-imaging set-ups. This critical review describes the latest developments in (i) the sensitization of near-infrared luminescence, (ii) "soft" luminescent materials (liquid crystals, ionic liquids, ionogels), (iii) electroluminescent materials for organic light emitting diodes, with emphasis on white light generation, and (iv) applications in luminescent bio-sensing and bio-imaging based on time-resolved detection and multiphoton excitation (500 references).

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“…A matrix enhances not only chemical and thermal stabilities of a complex but also its mechanical strength (De Bettencourt-Dias, 2007;Li et al, 2011) and its luminescence efficiency (Li et al, 2001;Lenaerts et al, 2005). Two principal approaches are considered in this aspect: synthesis of lanthanide-containing polymers Ling et al, 2002) and encapsulation of a lanthanide complex into polymer (He et al, 2016;George et al, 2016;Kishimoto et al, 2008). Polymers are ideal candidates for matrices as they possess attractive technological properties such as mechanical strength, flexibility, processability and low cost.…”

Section: Introductionmentioning

confidence: 99%

Optical and structural characteristics of PMMA films doped with a new anisometric Eu^III complex

Knyazev

Krupin

Gubaidullin

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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A new film material capable of transforming UV radiation into visible light was obtained from a highly anisometric Eu III complex with organic ligands in a polymethylmethacrylate (PMMA) matrix and then structurally characterized. An important advantage of the synthesized complex is its good solubility in organic solvents such as dichloromethane, chloroform, THF, toluene, etc. The ligand environment (flexible alkyl and cyclohexyl substituents) of the Eu III complex was selected to prevent crystallization, to inhibit the formation of defects in the structure of films and to provide its uniform distribution in the polymer during polymerization. As a result we obtain an Eu III complex of the film with remarkable thermal behavior: the complex melts to isotropic liquid without decomposition, it supercools at ambient temperature and it forms a stable amorphous material at low (up to À30 C) temperatures. The films were prepared by two methods: bulk polymerization and spin coating. A comparison of the differences of luminescent and optical characteristics of micro-and nanosized PMMA films doped with the anisometric Eu III complex is given. Based on X-ray powder diffraction and small-angle scattering data, it has been supposed that the association of Eu III complex molecules occurs in the voids of the PMMA matrix and is accompanied by the formation of a nanocrystalline phase. For films obtained by spin coating, a deeper microphase separation is demonstrated than by bulk polymerization. The dimensional characteristics of the nano-associates were determined and a correlation between the method of preparation and the type of distribution of the Eu III complex in the PMMA matrix is established.

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Near-infrared luminescent polymer thin films containing Yb(III) complex and photosensitized dye

Cited by 7 publications

References 19 publications

Lanthanide Complexes with 2-(Tosylamino)-benzylidene-N-(aryloyl)hydrazones: Universal Luminescent Materials

Lanthanide Complexes with 2-(Tosylamino)-benzylidene-N-(aryloyl)hydrazones: Universal Luminescent Materials

Lanthanide luminescence for functional materials and bio-sciences

Optical and structural characteristics of PMMA films doped with a new anisometric Eu^III complex

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Near-infrared luminescent polymer thin films containing Yb(III) complex and photosensitized dye

Cited by 7 publications

References 19 publications

Lanthanide Complexes with 2-(Tosylamino)-benzylidene-N-(aryloyl)hydrazones: Universal Luminescent Materials

Lanthanide Complexes with 2-(Tosylamino)-benzylidene-N-(aryloyl)hydrazones: Universal Luminescent Materials

Lanthanide luminescence for functional materials and bio-sciences

Optical and structural characteristics of PMMA films doped with a new anisometric EuIII complex

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Optical and structural characteristics of PMMA films doped with a new anisometric Eu^III complex