Electroluminescence from oligothiophene‐based light‐emitting devices

Geiger, F.; Stoldt, M.; Schweizer, H.; Bäuerle, Peter; Umbach, E.

doi:10.1002/adma.19930051210

Cited by 261 publications

(132 citation statements)

References 12 publications

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“…In our experiment, we focus on a large rodlike conjugated molecule, ␣-sexithiophene ͑␣-6T͒, which is a prototype molecule for devices such as field effect transistors ͑FETs͒, 28 -31 light emitting diodes ͑LEDs͒ 32,33 and transistors ͑LETs͒. 34 Besides the technological aspect of this molecule, the other reason for studying this molecule is that growth of oligothiophene thin films onto dielectric ͑oxidized silicon, 35 mica 36 -38 ͒, semimetal ͑HOPG͒ 39 and metal surfaces ͑Au, Ag, Al͒ [40][41][42][43] has been thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous dissociation of a conjugated molecule on the Si(100) surface

Lin

Galili

Quaade

et al. 2002

The Journal of Chemical Physics

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The adsorption mechanism of ␣-sexithiophene ͑␣-6T͒ on the clean Si(100)-(2ϫ1) surface has been investigated using scanning tunneling microscopy ͑STM͒ and first principles electronic structure calculations. We find that at submonolayer coverage, the ␣-6T molecules are not stable and dissociate into monomers. We observe two different configurations of the monomers and have discussed the corresponding adsorption geometries based on theoretical calculations. The calculations elucidate how the fragments are absorbed on the surface, giving rise to the observed STM images. With increasing coverage, the STM images show the existence of complete ␣-6T molecules. In addition, results of the adsorption behavior of ␣-6T molecules on the H-passivated Si(100)-(2ϫ1) surface are reported. On this surface the molecules are highly mobile at room temperature due to the weak molecule-substrate interaction. The STM results also indicate that they can easily be anchored at the defect sites.

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Section: Introductionmentioning

confidence: 99%

Spontaneous dissociation of a conjugated molecule on the Si(100) surface

Lin

Galili

Quaade

et al. 2002

The Journal of Chemical Physics

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“…153 Since the initial discovery of organic compounds showing metallic conductivity, for which 2000 Nobel prize in chemistry was awarded, [154][155][156] oligo-and polythiophenes have attracted much attention as advanced molecules with practical use in electronic devices [157][158][159][160] and their potential application in field-effect transistors, 161 photovoltaic devices 162 and organic electroluminescent devices. 163 The employment of substituted 2-aminothiophenes in such areas represents the latest discovery showing a great promise in materials chemistry for the generation of novel oligo-and polythiophene structures.…”

Section: Synthesis Of Building Blocks For Optoelectronicsmentioning

confidence: 99%

Gewald reaction: synthesis, properties and applications of substituted 2-aminothiophenes

Puterová¹,

Krutošíková²,

Végh³

2010

Arkivoc

177

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Chemistry of 2-aminothiophenes is arguably one of the most extensive and dynamic field of present-day thiophene research. Since 1961 when first report on the Gewald reaction was reported it became a universal method for synthesis of substituted 2-aminothiophenes and has gained prominence in recent times. The availability of reagents and the mild reaction conditions all contribute to the versatility of this reaction. This review summarizes the synthetic strategies for substituted 2-aminothiophenes. Consequently, details about the proposed mechanism of Gewald-like reactions and the wide scope of substituted 2-aminothiophenes for real life applications.

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“…3,5 In industry, phthalocyanines are widely used as dyes for textiles and for coating metallic surfaces. There is now a surge on their use for devices, for example, in photocopiers, solar cells, electrochromic displays, fuel cells, light-emitting diodes, transistors, optical limiters, in photodynamic therapy, [6][7][8][9][10][11][12][13][14][15][16][17][18] and sensors. 15,[19][20][21] In several of the possible applications, one important requirement is to produce materials in the form of thin films, which has been carried out for phthalocyanines with various methods, including Langmuir-Blodgett (LB), [22][23][24][25][26] electrostatic layer-bylayer (LbL), [27][28][29][30] physical vapor deposition (PVD), 31,32 and casting.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

et al. 2008

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The possibility of generating distinct film properties from the same material is crucial for a number of applications, which can only be achieved by controlling the molecular architecture. In this paper we demonstrate as a proof-of-principle that ultrathin films produced from iron phthalocyanine (FePc) may be used to detect trace amounts of copper ions in water, where advantage was taken of the cross sensitivity of the sensing units that displayed distinct electrical properties. The ultrathin films were fabricated with three methods, namely physical vapor deposition (PVD), Langmuir-Blodgett (LB), and electrostatic layer-by-layer (LbL) techniques, where for the latter tetrasulfonated phthalocyanine was used (FeTsPc). PVD and LB films were more homogeneous than the LbL films at both microscopic and nanoscopic scales, according to results from microRaman spectroscopy and atomic force microscopy (AFM), respectively. From FTIR spectroscopy data, these more homogeneous films were found to have FePc molecules oriented preferentially, tilted in relation to the substrate surface, while FeTsPc molecules were isotropically distributed in the LbL films. Impedance spectroscopy measurements with films adsorbed onto interdigitated gold electrodes indicated that the electrical response depends on the type of film-forming method and varies with incorporation of copper ions in aqueous solutions. Using principal component analysis (PCA), we were able to exploit the cross sensitivity of the sensing units and detect copper ions (Cu 2+ ) down to 0.2 mg/L, not only in ultrapure water but also in distilled and tap water. This level of sensitivity is sufficient for quality control of water for human consumption, with a fast, low-cost method.

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Electroluminescence from oligothiophene‐based light‐emitting devices

Cited by 261 publications

References 12 publications

Spontaneous dissociation of a conjugated molecule on the Si(100) surface

Spontaneous dissociation of a conjugated molecule on the Si(100) surface

Gewald reaction: synthesis, properties and applications of substituted 2-aminothiophenes

Exploiting Distinct Molecular Architectures of Ultrathin Films Made with Iron Phthalocyanine for Sensing

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