Soluble substituted-PPV conducting polymers: spectroscopic studies

Askari, Syed; Rughooputh, S. D. D. V.; Wudl, Fred

doi:10.1016/0379-6779(89)90287-7

Cited by 66 publications

(31 citation statements)

References 11 publications

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“…In 1989 Wudl and co-workers reported the synthesis of the first PPV derivative soluble in organic solvents, the dihexyloxy-substituted PPV (DH-PPV, 8, Scheme 2) [40], which is soluble in organic solvents at temperatures above 80 8C and whose synthesis was carried out by following the sulfonium salt route depicted in Scheme 2.…”

Section: Organic-solvent-soluble Ppv Derivativesmentioning

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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Section: Organic-solvent-soluble Ppv Derivativesmentioning

confidence: 99%

The chemistry of electroluminescent organic materials

Segura¹

1998

Acta Polym.

287

200

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“…14,15 The PPV samples used in this study were prepared via thermal conversion of films of a tetrahydrothiophenium leaving group precursor polymer. The films were converted under dynamic vacuum (10 Ϫ5 Torr) at a temperature of 220°C for 6 h. The MEH-PPV samples were made by spin coating from a 1% by weight solution of the polymer in toluene.…”

Section: Methodsmentioning

confidence: 99%

Linear and nonlinear optical properties of the conjugated polymers PPV and MEH-PPV

et al. 1999

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We have used absorption and electroabsorption spectroscopy to investigate the electronic structure of poly͑para-phenylene vinylene͒ ͑PPV͒ and poly "2-methoxy, 5-(2Ј-͑ethyl͒hexyloxy͒-p-phenylene vinylene… ͑MEH-PPV͒. In particular we examine the often used assumption that the electronic structure of PPV and its dialkoxy substituted derivatives are essentially the same. The absorption spectrum of PPV consists of three peaks, while that of MEH-PPV has four peaks. We discuss the controversial origin of the extra peak as well as evidence for Davydov splitting effects in the absorption spectrum of PPV. The analysis of the nonlinear spectra shows further differences between the two materials. First, the binding energy of the 1B u exciton for PPV is some 0.1 eV higher than for MEH-PPV. Second, the peak value of Im͕ (3) (Ϫ ;0,0, )͖ for PPV is approximately 40 times higher than that of MEH-PPV. We also found that the sum-over-states modeling of the electroabsorption spectra indicates that the transition dipole moment between the mA g and nB u states is of opposite sign in the two polymers. ͓S0163-1829͑99͒02523-0͔

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“…Many efforts have been made in recent years to improve the performance and stability of OLEDs because of their potential application in flat panel displays [5][6][7][8][9][10]. For the performance improvement of OLEDs, macrocyclic organic or conjugated polymeric thin films can be used as a light-emitting layer, a hole injection layer, and a hole transport layer material in the devices since charge injection and mobility can be enhanced through the layers [11,12]. In these fields, it is important to control the structural configuration of the devices at a molecular level.…”

Section: Introductionmentioning

confidence: 99%