Enhanced Emission from Europium Complex  Utilizing Quantum-Well Structure in Organic Electroluminescent Device

Ohmori, Yutaka; Ueta, Hiroyasu; Kurosaka, Yoshitaka; Hamada, Y.; Yoshino, Katsumi

doi:10.1143/jjap.37.l798

Cited by 26 publications

(4 citation statements)

References 14 publications

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“…Luminescent rare earth complexes, particularly europium β-diketonates, have been intensively studied with respect to applications for luminescence and as laser materials − since the first successful laser action in europium β-diketonate was reported by Lempicki and Samelson in 1963 . Recently, rare earth complexes have attracted considerable attention for organic electroluminescent (EL) devices − as well as for optical microcavity emitters 12,13 owing to their inherent extremely sharp emission bands and potentially high internal quantum efficiency. However, there are three major problems in using small rare earth complexes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Luminescence Properties of Novel Eu-Containing Copolymers Consisting of Eu(III)−Acrylate−β-Diketonate Complex Monomers and Methyl Methacrylate

et al. 2000

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Luminescent Eu-containing copolymers were synthesized through the copolymerization of Eu−complex monomers containing β-diketones with methyl methacrylate and characterized by FT-IR, UV−vis, XPS, GPC, TGA, and DSC. All these Eu copolymers are fully soluble in common organic solvents and can be cast into transparent, uniform, thin films with good mechanical flexibility and thermal stability. The Eu−copolymer luminophores exhibited intense red light at 615 nm under UV excitation at room temperature, which is attributed to the 5D0→7F2 transition of Eu(III) ions. The luminescence intensities, lifetimes and monochromaticities, η(5D0→7F2/5D0→7F1), of the Eu−copolymers are much higher than that of the corresponding Eu−complex monomers as well as Eu−complex/PMMA blends. Energy transfer processes and microenvironment effects were found to contribute to the improvement of the luminescence properties of the Eu−copolymers. A study of the dependence of emission intensities of the Eu−copolymers on the Eu content showed that the emission intensities increased nearly linearly with increasing Eu content, and no significant emission concentration quenching phenomenon was observed at the Eu content of 0−6.38 mol %. This indicates that the Eu−complex units in the Eu−copolymers are very uniformly bonded to the polymer chain, which is in good agreement with the result of polymer structure analysis.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Luminescence Properties of Novel Eu-Containing Copolymers Consisting of Eu(III)−Acrylate−β-Diketonate Complex Monomers and Methyl Methacrylate

et al. 2000

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“…Recently, Eu(III) complexes have attracted considerable attention for organic electroluminescent devices as well as optical microcavity emitters because of the inherently extremely sharp emission bands and potentially high internal quantum efficiency of Eu(III). Polymers incorporating Eu(III) have excellent properties with respect to the desired mechanical flexibility, solubility in organic solvents, and convenient processability for electrooptic sensors 34–40. Okamoto and coworkers 41 obtained a series of Re or Ln(III)‐containing polymers and studied their luminescent properties, even demonstrating the probability of laser materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of chiral polymer complexes incorporating polybinaphthyls, bipyridine, and Eu(III)

Cheng

Zou

Zhu

et al. 2007

J. Polym. Sci. A Polym. Chem.

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Chiral conjugated polymers P-1 and P-2 were synthesized by the polymerization of (S)-3,3 0 -diiodo-2,2 0 -bisbutoxy-1,1 0 -binaphthyl and (S)-6,6 0 -dibromo-2,2 0bisbutoxy-1,1 0 -binaphthyl, respectively, with 5,5 0 -divinyl-2,2 0 -bipyridine through a Heck cross-coupling reaction. Chiral polymer complexes P-C-1 and P-C-2 were obtained by the bipyridine chelating coordination of P-1 and P-2 with Eu(TTA) 3 Á2H 2 O (where TTA is 2-thenoyltrifluoroacetonate). Polymers P-1 and P-2 and polymer complexes P-C-1 and P-C-2 exhibited intense circular dichroism signals, with negative and positive Cotton effects in their circular dichroism spectra. The chiral polymers showed strong green-blue fluorescence because of the efficient energy migration from the extended p-electronic structure of the conjugated polymer main to the chiral binaphthyl core. The chiral polymer complexes could have not only polymer fluorescence but also the characteristic fluorescence of Eu(III) ( 5 D 0 ? 7 F 2 ) at a different excited wavelength. These kinds of chiral polymer complexes incorporating polybinaphthyls, bipyridine, and Eu(III) moieties are expected to provide an understanding of the relationship between the structure and properties of chiral polymer complexes. Scheme 3. Synthesis procedures for P-1, P-2, P-C-1, and P-C-2. 654 CHENG ET AL.

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“…Several new reagents have recently been introduced in this field. Luminescent markers utilizing europium b-diketonates have been developed [3][4][5][6][7][8][9][10][11][12][13][14]. These sophisticated tracing reagents overcome the disadvantages of the methods involving PAHs and phenolphthalein.…”

Section: Introductionmentioning

confidence: 99%

5-(4-Nitrophenyl)-2,4-pentadien-1-al (NPPD) used as a tracer by nonscientists at a simulated crime scene

Suzuki

Ohta

Suzuki

et al. 2005

Forensic Science International

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Enhanced Emission from Europium Complex Utilizing Quantum-Well Structure in Organic Electroluminescent Device

Cited by 26 publications

References 14 publications

Synthesis and Luminescence Properties of Novel Eu-Containing Copolymers Consisting of Eu(III)−Acrylate−β-Diketonate Complex Monomers and Methyl Methacrylate

Synthesis and Luminescence Properties of Novel Eu-Containing Copolymers Consisting of Eu(III)−Acrylate−β-Diketonate Complex Monomers and Methyl Methacrylate

Synthesis and characterization of chiral polymer complexes incorporating polybinaphthyls, bipyridine, and Eu(III)

5-(4-Nitrophenyl)-2,4-pentadien-1-al (NPPD) used as a tracer by nonscientists at a simulated crime scene

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