Electroluminescence of “wide-bandgap” chemically tunable cyclic conjugated polymers

Grem, G.; Leising, G.

doi:10.1016/0379-6779(93)90565-e

Cited by 152 publications

(76 citation statements)

References 13 publications

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“…Unfortunately, the solid-state emission is dominated by a broad, featureless band around 600 nm in the yellow part of the spectrum. [31][32][33][34] The relative intensities of blue and yellow emission bands from 3a is heavily dependent upon the method used to prepare the films and upon the solvent used and the film thickness. Annealing films of 3a leads to the disappearance of the blue band.…”

Section: Ladder-type Poly(para-phenylene)s (Lppps)mentioning

confidence: 99%

Oligomers and Polymers Based on Bridged Phenylenes as Electronic Materials

Grimsdale

Müllen

2007

Macromol. Rapid Commun.

191

154

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The synthesis, properties, and application in electronic devices of ladder and step‐ladder phenylene‐based oligomers and polymers are reviewed with an emphasis on control of properties by synthetic design. Bridged polyphenylenes can be prepared with a range of different amounts and types of bridges. Fully bridged polymers suffer the problem of incomplete formation of bridges during polymer analogous reactions. This problem is surmounted by the synthesis of regular stepladder polymers in which the monomers are well‐characterized oligo(ladder‐phenylene)s. By controlling the degree of bridging and thus the planarity of the polymer, its optical properties can be tuned. The optical and electronic properties can be further controlled by means of the type of bridges used.

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Section: Ladder-type Poly(para-phenylene)s (Lppps)mentioning

confidence: 99%

Oligomers and Polymers Based on Bridged Phenylenes as Electronic Materials

Grimsdale

Müllen

2007

Macromol. Rapid Commun.

191

154

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“…Aggregation in the solid state influences the optical properties of conjugated systems considerably and often in an unwanted fashion 8) . The flipside of this coin is that aggregation and supramolecular ordering in conjugated polymers are superbly detectable by optical probes including absorption, fluorescence, and if chiral polymers are involved, circular dichroism (CD).…”

Section: Introductionmentioning

confidence: 99%

Aggregation and chiroptical behavior of a high molecular weight chirally substituted dialkylpoly(p-phenyleneethynylene)

Fiesel

Halkyard

Rampey

et al. 1999

Macromol. Rapid Commun.

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SUMMARY: The solvent and temperature dependent aggregation of high molecular weight bis[S-(+)-3,7-dimethyloctyl)] substituted poly(p-phenyleneethynylene) (PPE, 2) was examined by absorption, emission and circular dichroism spectroscopy. All herein employed methods strongly support the view that 2 forms ordered aggregates in the solid state and in solvent mixtures. This is the first case in which a chiral high molecular weight PPE displays its aggregation by both optical and chiroptical methods.

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“…4 Compared to many other conducting polymers which normally have low chemical and thermal stability, poor mechanical strength, or limited possibilities in tuning the wavelength, the wide-gap polymeric PPP is stable in air up to 400°C, 5 and its electronic structure and optical properties can be modified by several chemical methods. [6][7][8][9][10][11][12] Experimentally, the conformation of crystalline PPP as well as the crystalline oligomers of the phenyl ring have been studied extensively. The nuclear configuration is known only for finite oligomers.…”

Section: Introductionmentioning

confidence: 99%

First-principles calculation of the conformation and electronic structure of polyparaphenylene

Miao

Camp

Doren

et al. 1998

The Journal of Chemical Physics

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A first-principles density-functional calculation of the electronic and vibrational structure of the key melanin monomers J. Chem. Phys. 120, 8608 (2004) In this article, an all-electron first-principles total energy calculation with Gaussian-type functions for the wave functions, for the exchange correlation potential, and for the charge density has been applied for single chains of polyparaphenylene ͑PPP͒. A local-density approximation within a helical band structure approach has been used. The calculated torsional potential shows a minimum at the torsion angle of 34.8°. The internal coordinates were optimized in the equilibrium conformation and are in good agreement with experimental and other theoretical results. The calculated direct band gap is 2.54 eV compared with the experimental result from UPS spectra of 3.4 eV for the gas phase. The band structure strongly depends on the conformation which suggests that the electronic properties can be modified in a wide range through doping or addition of side groups.

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Electroluminescence of “wide-bandgap” chemically tunable cyclic conjugated polymers

Cited by 152 publications

References 13 publications

Oligomers and Polymers Based on Bridged Phenylenes as Electronic Materials

Oligomers and Polymers Based on Bridged Phenylenes as Electronic Materials

Aggregation and chiroptical behavior of a high molecular weight chirally substituted dialkylpoly(p-phenyleneethynylene)

First-principles calculation of the conformation and electronic structure of polyparaphenylene

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