Ink-jet printing of polymer light-emitting devices

Duineveld, Paul C.; Kok, Margreet M. de; Buechel, Michael; Sempel, Aad; Mutsaers, Kees A. H.; Weijer, Peter van de; Camps, I. G. J.; Biggelaar, Ton van de; Rubingh, Jan-Eric J. M.; Haskal, E. I.

doi:10.1117/12.457460

Cited by 80 publications

(44 citation statements)

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“…To prevent the droplets from flowing over the barriers they were treated with a CF 4 plasma to render the surface of the polyimide hydrophobic without changing the hydrophilic properties of the (inorganic) substrate. The important aspect of substrate wetting is discussed in more detail by Duineveld and co-workers, both in the case of printing between barriers [22] and on a homogeneous substrate. [28] In the latter paper the stability of an inkjet printed liquid line on a surface was investigated both experimentally and theoretically, as a function of surface properties and print head velocity.…”

Section: Manufacturing Of Pled Displays and Liquid-crystal Display Comentioning

confidence: 99%

“…A disadvantage is the restriction to low viscosities, and therefore low polymer concentrations. [22] An overview of PLED display technology, including inkjet printing fabrication was recently given by Haskal et al [23] Inkjet printing was used to create 200 lm diameter dots of polyvinylcarbazol (M w 1.1 10 6 , 10 g L ±1 solution in chloroform), using a Canon PJ-1080A color inkjet printer. [24] The polymer was doped with various emitting dyes to obtain different colors.…”

Section: Manufacturing Of Pled Displays and Liquid-crystal Display Comentioning

confidence: 99%

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Inkjet Printing of Polymers: State of the Art and Future Developments

Gans

Duineveld

Schubert³

2004

Advanced Materials

1,758

1,199

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Inkjet printing is considered to be a key technology in the field of defined polymer deposition. This article provides an introduction to inkjet printing technology and a short overview of the available instrumentation. Examples of polymer inkjet printing are given, including the manufacturing of multicolor polymer light‐emitting diode displays, polymer electronics, three‐dimensional printing, and oral dosage forms for controlled drug release. Special emphasis is placed upon the utilized polymers and conditions, such as polymer structure, molar mass, solvents, and concentration. Studies on viscoelastic fluid jets and the formation of viscoelastic droplets under gravity indicate that strain hardening is the key parameter that determines the inkjet printability of polymer solutions.

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Section: Manufacturing Of Pled Displays and Liquid-crystal Display Comentioning

confidence: 99%

Section: Manufacturing Of Pled Displays and Liquid-crystal Display Comentioning

confidence: 99%

Inkjet Printing of Polymers: State of the Art and Future Developments

Gans

Duineveld

Schubert³

2004

Advanced Materials

1,758

1,199

View full text Add to dashboard Cite

show abstract

“…However, they can be easily processed from solutions. In order to obtain thin layers of polymers various techniques such as spin-coating, bar-coating, [3] and inkjet printing [4,5] have been suggested. However, the application of various layers on top of each other remains a problem as uncommon solvents need to be used in the production of successive layers.…”

mentioning

confidence: 99%

Electron‐Beam‐Induced Crosslinking of Electroluminescent Polymers for the Production of Multi‐Color Patterned Devices

Hikmet¹,

Thomassen²

2003

Advanced Materials

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Organic light-emitting diodes are considered for various applications ranging from lighting to full-color emissive displays. In a very basic configuration such a diode is obtained by sandwiching an electroluminescent polymer between two electrodes.[1] Upon application of a voltage, light is generated as a result of the recombination of holes and electrons injected into the polymeric layer. In the case of low-molecular-weight organic molecules, various layers with various functions are used in order to obtain highly efficient devices.[2] These layers are chosen to have properties such as hole or electron transport, hole or electron blockage and high emission. The layers can be stacked by successive vapor deposition steps. As opposed to low-molecular-weight organic molecules, polymers layers can not be produced by physical vapor deposition. However, they can be easily processed from solutions. In order to obtain thin layers of polymers various techniques such as spin-coating, bar-coating, [3] and inkjet printing [4,5] have been suggested. However, the application of various layers on top of each other remains a problem as uncommon solvents need to be used in the production of successive layers. Furthermore, patterning such polymeric layers for the production of full-color displays is an issue. Currently inkjet printing is widely used in the production of full-color displays emitting red, blue, and green (RGB) light. [6] This technique is different than the technique of crosslinking which is used in established display technologies such as cathode ray tubes and liquid-crystal displays. In the case of liquid-crystal displays, [7] color filters are produced by successive steps of application of a colored layer, followed by crosslinking induced by illumination with ultraviolet (UV) light projected through a mask, and subsequent removal of the uncrosslinked regions by solvent-developing. This procedure is repeated for each color in order to obtain a color filter array. In the same way, full-color cathode ray tubes are also obtained by applying three different types of phosphor assisted by a polymeric binder which can also be crosslinked using UV light. In order to induce crosslinking by UV light it is necessary to have molecules with reactive groups such as acrylate, epoxy etc. Electroluminescent molecules with reactive groups have already been described. [8] However, these groups can have a negative effect on the luminescent properties of the polymer, and the photoinitiators which are needed for UV-initiated polymerization usually act as luminescence quenchers. Furthermore, UV radiation is known to induce photobleaching in such polymers. In this article, we will demonstrate the use of an alternative technique of electron-beam-induced crosslinking of two different types of electroluminescent poly(phenylene vinylene) (PPV). Electroluminescent polymers usually have flexible aliphatic sidegroups which are necessary to increase the solubility of the polymer in common organic solvents. When alkanes are subjected to high-ener...

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“…Liquid ribbons like these can be seen in everyday life, as on car windscreens or in breaking uniform fluid films. Their study is also important in applications like Direct-Write, 1-4 printed electronics, 5 and material functionalisation, 6 which are different kinds of micro-and nano-fluidics applications. 7 Knowledge of the stability properties of this system is of fundamental importance, either because the breakup into droplets is an unwanted phenomenon or because a regular rupture pattern is desired.…”

Section: Introductionmentioning

confidence: 99%

The influence of inertia and contact angle on the instability of partially wetting liquid strips: A numerical analysis study

et al. 2014

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The stability of a thread of fluid deposited on a flat solid substrate is studied numerically by means of the Finite Element Method in combination with an Arbitrary Lagrangian-Eulerian technique. A good agreement is observed when our results are compared with predictions of linear stability analysis obtained by other authors. Moreover, we also analysed the influence of inertia for different contact angles and found that inertia strongly affects the growth rate of the instability when contact angles are large. By contrast, the wave number of the fastest growing mode does not show important variations with inertia. The numerical technique allows us to follow the evolution of the free surface instability until comparatively late stages, where the filament begins to break into droplets. The rupture pattern observed for several cases shows that the number of principal droplets agrees reasonably well with an estimation based on the fastest growing modes. C 2014 AIP Publishing LLC.

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Ink-jet printing of polymer light-emitting devices

Cited by 80 publications

References 1 publication

Inkjet Printing of Polymers: State of the Art and Future Developments

Inkjet Printing of Polymers: State of the Art and Future Developments

Electron‐Beam‐Induced Crosslinking of Electroluminescent Polymers for the Production of Multi‐Color Patterned Devices

The influence of inertia and contact angle on the instability of partially wetting liquid strips: A numerical analysis study

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