Tunable electroluminescence and photoluminescence in phenylenevinylene‐naphthylenevinylene copolymers**

Faraggi, Erez Z.; Chayet, H.; Cohen, Gil; Neumann, Ronny; Avny, Yain; Davidov, D.

doi:10.1002/adma.19950070814

Cited by 47 publications

(18 citation statements)

References 10 publications

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“…GPC measurements were not performed since the studied polymers are insoluble in solvents like THF or CHCl 3 at RT which are commonly used for GPC measurements. The chemical structures of the polymers were confirmed by FTIR, 1 H NMR, and 13 C NMR spectroscopy, as seen in Figures 1-3. FTIR spectrum of polyether IIe, see Figure 1, shows a strong absorption due to the ether linkage at 1244 cm…”

Section: Polymer Synthesis and Characterizationmentioning

confidence: 93%

“…The films were very thin in order to exclude the influence of the film thickness on the max shifting. 13 The results are shown Figure 12. The emission maximum of the polyether IIf, with 12 methylene units in the flexible spacer, appear to be blue shifted (540 nm) compared to its emission in solution (580 nm).…”

Section: Optical Propertiesmentioning

confidence: 94%

“…In this respect, the more electron-rich naphthalene units have been used instead of the phenyl rings; this is expected to modify the band structure, and subsequently modulation of the optical properties of the polymers can be achieved. 12,13 In most naphthylenevinylene type polymers, the naphthalene units are linked through the 1,4 position, 14 -18 while in the case of 2,6-naphthalenevinylene derivatives, substitution is needed to prevent solubility. 12,19 -20 in order to decrease the electronic gap of the polymer.…”

Section: Introductionmentioning

confidence: 99%

“…In the aromatic region, polyether IIe shows doublet peaks at 7.6 and 7.9 ppm, and multiplet peaks at 7.0, 7.5, and 8.4 ppm. Additionally, 13 C NMR spectra for representative examples of both structures, in cases where there are no solubility limitations, are shown in Figure 3. In both cases, the presence of the carbon atoms of the aliphatic spacer in the region of 24 -32 ppm is clearly shown.…”

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confidence: 99%

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Soluble rigid-flexible polyethers containing bis(biphenyl)anthracene or bis(styryl)anthracene units in the main chain for light-emitting applications

Konstandakopoyloy

Kallitsis

1999

J. Polym. Sci. A Polym. Chem.

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New rigid–flexible polyethers containing bis(biphenyl)anthracene or bis(styryl)anthracene units in the main chain were synthesized and characterized by viscosimetry, thermal and mechanical analysis, NMR, UV‐vis, and luminescence spectroscopy. The polyethers containing bis(styryl)anthracene units in the main chain form free‐standing films either from solution casting or after melt pressing at temperatures where they are thermally stable. The length of the flexible spacer influences the thermal and mechanical behavior of these polymers. The isotropization temperature as well as the glass transition temperature show an odd–even effect depending on the spacer segment length. Films with high modulus at room temperature and glass transition temperatures in the range 74–103°C were obtained using dynamic mechanical analysis. These polymers show bright‐yellow photoluminescence with maximum at 580 nm in solution. In the solid state, the luminescence maximum is either red or blue shifted depending on the number of the methylene units in the aliphatic segment. The polyethers containing bis(biphenyl)anthracene units in the main chain are blue‐light‐emitting polymers with photoluminescence maxima at 435 and 455 nm in solution. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3826–3837, 1999

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Section: Polymer Synthesis and Characterizationmentioning

confidence: 93%

Section: Optical Propertiesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Soluble rigid-flexible polyethers containing bis(biphenyl)anthracene or bis(styryl)anthracene units in the main chain for light-emitting applications

Konstandakopoyloy

Kallitsis

1999

J. Polym. Sci. A Polym. Chem.

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“…[1,2] Although many conjugated polymers have been designed to give efficient and stable blue light emission, [3±7] only a few of these polymers are promising candidates for use in blue-light-emitting PLEDs. Polyfluorenes (PFs) were recently introduced as prospective blue-light-emitting materials for PLEDs because of their extremely high luminescence efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Stabilized Blue Emission from Polymer–Dielectric Nanolayer Nanocomposites

Park

Lim

Park

et al. 2004

Adv Funct Materials

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Blue‐light‐emitting polymer (polyfluorene)/dielectric nanolayer nanocomposites were prepared by the solution intercalation method and employed in an electroluminescent (EL) device. Their photoluminescence (PL) and electroluminescence characteristics demonstrates that the interruption of interchain interaction in intercalated organic/inorganic hybrid systems reduces the low‐energy emission that results from keto‐defects. By reducing the probability that the excitons initially generated on the polyfluorenes will find keto‐defects, both the color purity and the luminescence stability were improved. Furthermore, the dielectric nanolayers have an aspect ratio of about five hundred, and therefore act as efficient exciton blocking layers and barriers to oxygen diffusion, producing a dramatic increase in the device stability. A nanocomposite device with a Li:Al alloy cathode gave a quantum efficiency of 1.0 %(ph/el), which corresponds to an approximate five times enhancement compared to the neat polymer device. The nanocomposite emitting layer is considered to have a pseudo‐multiple quantum well structure.

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Oligo-2,6-naphthylenevinylenes – New Building Blocks for the Preparation of Photoluminescent Polymeric Materials

1999

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Synthetic strategies towards appropriate symmetric and unsymmetric functionalization of the naphthalene ring are presented. By means of Knoevenagel and Wittig condensation reactions new fluorescent, differently functionalized oligo(2,6‐naphthylenevinylene)s have been synthesized, the presence of terminal aldehyde or bromine substitution opening the way to the incorporation of the fluorescent trimers in a variety of polymeric materials. The effect of substituting the phenylene ring by the more bulky dialkoxynaphthalene system in arylenevinylene‐type materials is studied from the structural point of view and the possibility to tune the emission color and the electron affinity through the introduction of naphthylenevinylene and cyano‐substituted naphthylenevinylene units is also investigated.

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Tunable electroluminescence and photoluminescence in phenylenevinylene‐naphthylenevinylene copolymers**

Cited by 47 publications

References 10 publications

Soluble rigid-flexible polyethers containing bis(biphenyl)anthracene or bis(styryl)anthracene units in the main chain for light-emitting applications

Soluble rigid-flexible polyethers containing bis(biphenyl)anthracene or bis(styryl)anthracene units in the main chain for light-emitting applications

Stabilized Blue Emission from Polymer–Dielectric Nanolayer Nanocomposites

Oligo-2,6-naphthylenevinylenes – New Building Blocks for the Preparation of Photoluminescent Polymeric Materials

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