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Electroluminescent Materials (electroluminescent + material)

Distribution by Scientific Domains
Chemistry71%

Selected Abstracts

ChemInform Abstract: ortho-Fused Heterocyclic Derivatives as Efficient Electroluminescent Materials.

CHEMINFORM, Issue 27 2002
Kazuhiko Tanaka
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Synthesis and characterization of new blue-greenish electroluminescent materials based on 1,3,4-oxadiazole-triazolopyridinone hybrids

HETEROATOM CHEMISTRY, Issue 3 2007
Ming-Hsiang Shin
New functionalized oxadiazole-triazolopyridinone derivatives were synthesized via arcycloaddition. With the chromophores of triazolopyridinone, the photoluminescence spectra of these compounds in dichloromethane solution showed emission peaks between 430 and 520 nm. Following the spectroscopic studies, and the measurements of cyclic voltammogram, 1,3,4-oxadiazole-triazolopyridinone hybrids possess a great potential as highly efficient, blue-greenish, organic light-emitting devices materials. © 2007 Wiley Periodicals, Inc. Heteroatom Chem 18:212,219, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20285 [source]

New synthesis of highly potential efficient bluish-green electroluminescent materials based on 1,3,4-oxadiazole,triazolopyridinone,carbazole derivatives for single-layer devices

HETEROATOM CHEMISTRY, Issue 2 2006
Ming-Hsiang Shin
New potential bluish-green electroluminescent materials of 1,3,4-oxadiazole,triazolopyridin- one,carbazole derivatives were synthesized and characterized for single-layer devices. Carbazole, pyridine, and triazolopyridinone were completely introduced into 1,3,4-oxadiazole skeletal to play assistant roles in controlling fundamental photolytic process due to the electron-donating nature, excellent photoconductivity, and flexible structure properties. Following the spectroscopic studies and the measurements of cyclic voltammogram, 1,3,4-oxadiazole,triazolopyridinone,carbazole derivatives were highly efficient bluish-green electroluminescent materials. © 2006 Wiley Periodicals, Inc. Heteroatom Chem 17:160,165, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20201 [source]

Theoretical design study on multifunctional triphenyl amino-based derivatives for OLEDs

JOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 11 2009
Lu-Yi Zou
Abstract The use of triphenyl amino-based derivatives in organic light-emitting diodes (OLEDs) can significantly improve their efficiency and stability and especially their electroluminescence characteristics , most of the new hole-transport materials have this feature. In this study, a series of triphenyl amino-based compounds were computed, including two newly designed molecules. They can function as charge transport materials and emitters with high efficiency and stability. To reveal the relationship between the properties and structures of these bifunctional and multifunctional electroluminescent materials, the ground and excited state geometries were optimized at the B3LYP/6-31G(d), HF/6-31G(d), TD-B3LYP/6-31G(d), and CIS/6-31G(d) levels, respectively. The ionization potentials (IPs) and electron affinities (EAs) were computed. The lowest excitation energies, the maximum absorption, and emission wavelengths of these compounds were calculated by employing the time-dependent density functional theory (TD-DFT) method. Also, the mobilities of holes and electrons were studied computationally based on the Marcus electron transfer theory. The CH2Cl2 solvent effect on the absorption spectra of N,N,-di-1-naphthyl- N,N,-diphenylbenzidine (NPB) was considered by polarizable continuum model (PCM). The results obtained for these compounds are in good agreement with the experimental values. These data show that the proposed compounds 1 and 2 (N,B-di-1-naphthyl-N,B-diphenylbenzidine and Mes2N[p-4,4,-biphenyl-NPh(1-naphthyl)]), are multifunctional and bifunctional materials similar to Mes2B[p -4,4,-biphenyl-NPh(1-naphthyl)] (BNPB) and NPB, respectively. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Promising Optoelectronic Materials: Polymers Containing Phosphorescent Iridium(III) Complexes

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 9-10 2010
Qiang Zhao
Abstract As one of the most promising optoelectronic materials, polymers that contain phosphorescent IrIII complexes have attracted more and more interest in recent years. They are a class of well-known electroluminescent materials with excellent performance. So far, efficient green-, red-, and white-emitting polymer light-emitting diodes based on polymers with on-chain IrIII complexes have been realized successfully. For the realization of this class of polymer material, IrIII complexes (as energy guest) can be introduced into the main-chain or side-chain of polymers (as energy host). In this article, we summarize the design principles, synthetic routes, structure,property relationships, and applications in optoelectronic devices of polymers that contain phosphorescent IrIII complexes. [source]

Anomalous current,voltage characteristics of thin polymer films

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 2 2003
V. A. Kolesnikov
Abstract In this paper we have investigated organic light emitting diodes with such electroluminescent materials as aromatic polyimide, poly,N-vinylcarbazole (PVK) and dye doped PVK. N-type current,voltage characteristics with negative differential resistance for the thin polymeric and organic films are analyzed. No reasonable explanation has been provided for this phenomenon until now. Here we suggest that a polymer(organic)/metal interface containing various inhomogeneities and metal spikes is responsible for this effect. We detect also the black-body radiation, whose temperature exceeds both the melting point and the sublimation temperature of the metal of the electrode. We suppose that the current density through the spike in any cases is large enough to cause the explosion of the tip of the spike and the detected radiation has the hot plasma origin. (© 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]