Newly synthesized conjugated copolymers for light emitting diodes

Benjamin, I.; Faraggi, Erez Z.; Cohen, Gil; Chayet, H.; Davidov, D.; Neumann, Ronny; Avny, Yair

doi:10.1016/s0379-6779(97)80802-8

Cited by 60 publications

(8 citation statements)

References 7 publications

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“…The color of the copolymers' PL and EL emission is tunable between the colors of the homopolymers by controlling the ratio of comonomers; for example, copolymer 227 with 50% naphthalene units shows an EL maximum at 580 nm. 672 Ternary copolymers 229 with tetrafluorophenyl units have also been made by the Wessling route, but in low yield and molecular mass. 672 The PL maximum of the copolymer 229 with 50% naphthalene and 10% tetrafluorophenyl units is at about 550 nm.…”

Section: Other Poly(arylene Vinylene)smentioning

confidence: 99%

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

et al. 2009

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Section: Other Poly(arylene Vinylene)smentioning

confidence: 99%

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

et al. 2009

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“…Naphthalene units can be linked in the polymer in different ways [71], the most extensively studied naphthylenevinylene type polymers being those in which the naphthalene units are linked through the 1,4 positions of the naphthalene ring [121,122]. A comparison between polymers that incorporate naphthalene units through different linking positions shows that incorporation through 1,4 positions has a significant effect on the bandgap whereas incorporation through the 2,6 positions does not have such an effect [123]. This fact was further evidenced by theoretical calculations, which show that the energy gap is very similar in co(2,6-NV-PV) (46) and PPV but it is significantly smaller in co(1,4-NV-PV) (47).…”

Section: Modification Of Electronic Properties Of Conjugated Polymersmentioning

confidence: 99%

“…Different strategies have been followed in order to obtain processable main-chain polymers containing charge transporting chromophores. In 1995 syntheses of processable main-chain aromatic oxadiazole (co)polymers using flexible hexafluoropropylidene as spacers (112,123) were reported. Polymers can be obtained by a one-pot reaction of the diacid 120 with the dicarboxylic hydrazide 121 and/ or hydrazide sulfate 122 at 100 8C in the presence of P 2 O 5 1CH 3 SO 3 H, which serves both as solvent and cyclodehydrating agent [227] (Scheme 14).…”

Section: Main-chain Polymers With Isolated Chromophoresmentioning

confidence: 99%

The chemistry of electroluminescent organic materials

Segura¹

1998

Acta Polym.

287

200

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Electroluminescence has been a subject of interest for several decades because of its many applications in areas such as telecommunications or information displays. Light‐emitting diodes using p‐n junctions of inorganic semiconductors have dominated the field in the last twenty years; however, efficient blue emission has only recently been achieved and inorganic semiconductors are difficult to form over large areas, making the process uneconomic. During the last decade, an explosive growth of activity in the area of organic electroluminescence has occurred in both academia and industry, stimulated by the promise of light‐emitting plastics for the fabrication of large, flexible, inexpensive and efficient screens to be used in different applications. Thus, a substantial amount of research is presently directed towards color control and improvement of manufacturability and reliability of devices in order to make their commercialization viable. A great deal of work has been carried out by physicists and materials scientists concerned with the preparation of different device structures and with the use of different techniques for device manufacture. However, all this work would not be possible without the continuous efforts of synthetic chemists to prepare materials with enhanced luminescent properties and processabilities. This article provides a review of the main types of organic materials that have been used in the fabrica‐tion of light‐emitting diodes either as emitting materials or as charge‐transport layers. Special attention will be paid to the different synthetic strategies that have been followed in order to tune the color of the emission, to increase stability of materials and to enhance their processabilities.

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“…Polynaphthalenes show a high quantum efficiency9 and good thermal stability, but their poor solubility and very‐rigid structure limit their application. To overcome these difficulties, naphthalene units have been used for the preparation of π‐conjugated copolymers of fluorene, phenylene vinylene, thiophene, carbazole and so on 10–16. The solubility can be increased by the extensive substitution of the aromatic main chain.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of an Amphiphilic Blue‐Light‐Emitting Glycosylated Poly(naphthalene/phenylene) Copolymer

Nagy

Rácz

Daróczi

et al. 2011

Macro Chemistry & Physics

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The preparation and self‐assembly of poly(2‐glucopyranosyl‐1,6‐naphthalene‐1,4‐phenylene), P16NP2Glu, an amphiphilic, blue‐light‐emitting copolymer, is reported. The copolymer is soluble in polar solvents such as methanol/THF mixtures and even in water. The emission spectrum of P16NP2Glu shows a maximum at ≈400 nm for solutions containing the above solvents. Owing to the highly polar nature of the glucopyranose rings of P16NP2Glu, the formation of aggregates is observed. Uniform‐size nanospheres capable of emitting blue light are prepared in the solid phase. The critical micelle concentration and micelle sizes are determined by light‐scattering measurements. It is found that the emission maximum and fluorescence quantum yields depend on the aggregate formation of the copolymer.magnified image

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Newly synthesized conjugated copolymers for light emitting diodes

Cited by 60 publications

References 7 publications

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

The chemistry of electroluminescent organic materials

Synthesis and Characterization of an Amphiphilic Blue‐Light‐Emitting Glycosylated Poly(naphthalene/phenylene) Copolymer

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