New aromatic Poly(1,3,4-oxadiazole)s for light emitting diodes

Schulz, Burkhard; Kaminorz, Yvette; Brehmer, L.

doi:10.1016/s0379-6779(97)80826-0

Cited by 91 publications

(19 citation statements)

References 8 publications

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“…These new poly(1,3,4-oxadiazole)s have excellent film-forming properties due to their solubility in common organic solvents and have been used as emission material in single-layer LEDs, showing light emission in the range of blue to yellow. The external quantum efficiency and the turn-on voltage of the devices are influenced when blends of the polyoxadiazole with hole-transport materials are used [159]. Non-conjugated polymers containing 1,3,4-oxadiazole units either in the main chain or as side substituents have been extensively used in the fabrication of LEDs, compounds of this type being reviewed in the next sections.…”

Section: Modification Of Electronic Properties Of Conjugated Polymersmentioning

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: Modification Of Electronic Properties Of Conjugated Polymersmentioning

confidence: 99%

The chemistry of electroluminescent organic materials

Segura¹

1998

Acta Polym.

287

200

View full text Add to dashboard Cite

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“…The films based on polymer C show a red shift of electroluminscence emission, which was explained by possible ordered structures or intermolecular interactions [47].…”

Section: IImentioning

confidence: 92%

“…This is an important advantage compared with related poly(oxadiazole-amide)s without silicon, previously reported, which do not have any glass transition [45]. Similar to other aromatic or heteroaromatic conjugated polymers such as poly( p-phenylene), poly( p-phenylene-vinylene) or polythiophene, aromatic polyoxadiazoles have attracted much interest because they can easily undergo chemical and electrochemical redox reactions and the resulting conducting materials may be used in electrochemical sensors, electroluminescent devices for data display, optical data processing or other [46,47]. The oxadiazole ring acts as an electron acceptor and its redox behavior is influenced by the nature of aromatic neighbors in the chain [48].…”

Section: IImentioning

confidence: 99%

Silicon-containing polyoxadiazoles—synthesis and perspectives

Brumă¹,

Köpnick²

2005

Advances in Colloid and Interface Science

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“…In general, polymers containing oxadiazole and thiadiazole derivatives either in the main chains or in the side chains have been widely used as electron transporting/hole blocking materials in organic LEDs. [34][35][36][37][38][39] However, the electron deficiency in the polymers was not high enough to obtain compounds with a reduction potential less negative than À0.8 V, which means that oxygen is more easily reduced. A high electron deficiency can be achieved using additional electron withdrawing groups like pyridines instead of phenyl groups.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Multilayer Thin Films by Layer‐by‐Layer Assembly of Hole‐ and Electron‐Transport Polyelectrolytes: Optical and Electrochemical Properties

Choi

Zentel

2006

Macro Chemistry & Physics

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Summary: In this paper, we present the synthesis of a series of p‐type and n‐type semiconducting polyelectrolytes with triarylamine, oxadiazole, thiadiazole and triazine moieties. The synthesized polymeric hole and electron transport materials were examined optically and electrochemically using UV/Vis spectroscopy, PL spectroscopy and CV. Based on the optical and electrochemical data, each of the energy levels were calculated and all values suggested that they were promising hole‐ (p‐type) or electron‐transport (n‐type) materials for devices. Moreover, the synthesized ionic polymers were suitable for LBL thin film deposition from dilute polymer solutions and the multilayers were fully characterized by UV/Vis, PL spectroscopy and CV. magnified image

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New aromatic Poly(1,3,4-oxadiazole)s for light emitting diodes

Cited by 91 publications

References 8 publications

The chemistry of electroluminescent organic materials

The chemistry of electroluminescent organic materials

Silicon-containing polyoxadiazoles—synthesis and perspectives

Multilayer Thin Films by Layer‐by‐Layer Assembly of Hole‐ and Electron‐Transport Polyelectrolytes: Optical and Electrochemical Properties

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