Slot die stripe coating of low viscous fluids

Raupp, S.; Schmitt, Markus; Walz, Anna-Lena; Diehm, Ralf; Hummel, Helga; Scharfer, Philip; Schabel, Wilhelm

doi:10.1007/s11998-017-0039-y

Cited by 18 publications

(11 citation statements)

References 32 publications

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“…These findings consistently expand results known from the literature. In particular, Raupp et al [9] describe the formation of parallel stripes in a range of coating velocities as rivulets. The also described ribbing -a weaker modulation of film thickness also parallel to the coating direction -has not been found here.…”

Section: Discussionmentioning

confidence: 99%

“…They observe the formation of periodic stripes and regular arrangements of bubbles in shear-thinning, non-Newtonian liquids with relatively high viscosity. Raupp et al [9] observe breakup of a homogeneous film and formation of parallel stripes in a certain range of low film thicknesses and coating velocities. In both cases, the orientation of the stripes is parallel to the coating direction, i.e., the slot-die velocity.…”

Section: Introductionmentioning

confidence: 99%

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Pattern Formation in Slot-Die Coating

Kasischke¹,

Hartmann²,

Kevin³

et al. 2021

Preprint

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We experimentally study the occurrence of pattern formation during the slot-die coating of lowviscosity nearly Newtonian liquids onto Polyethylenterephthalat (PET)-substrates. In particular, it is demonstrated that with increase of the coating speed a homogeneous coating becomes unstable with respect to periodic stripe patterns. Thereby, depending on the liquid viscosity, the stripes can be oriented parallel or perpendicular with respect to the coating direction. Mixed states do also occur. The spatial period of perpendicular [parallel] stripes increases [decrease] with the coating speed. The dependence of the effect on various control parameters of slot-die coating is investigated.Finally, a simple theoretical model based on the hydrodynamics of thin films of partially wetting liquids is analysed. Comparing the results to the experiments, conclusions are drawn regarding the acting instability and pattern formation mechanisms.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pattern Formation in Slot-Die Coating

Kasischke¹,

Hartmann²,

Kevin³

et al. 2021

Preprint

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“…The application method is suitable for a wide range of viscosities, from high viscous battery slurries with values up to 1000 mPa•s [23] to low viscosity solutions, which behave like pure solvents [24]. Another advantage of this application technique is the possibility to produce structured coatings like patches or stripes as well as simultaneous multilayer coatings [17,[25][26][27][28]. Some limiting factors and film defect sources need to be taken into consideration in order to optimize the application process.…”

Section: Slot Die Coatingmentioning

confidence: 99%

Comparative Study of Printed Multilayer OLED Fabrication through Slot Die Coating, Gravure and Inkjet Printing, and Their Combination

Merklein

Daume

Braig

et al. 2019

Colloids and Interfaces

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In this study, multilayer organic light-emitting diodes (OLEDs) consisting of three solution-processed layers are fabricated using slot die coating, gravure printing, and inkjet printing, techniques that are commonly used in the industry. Different technique combinations are investigated to successively deposit a hole injection layer (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)), a cross-linkable hole transport layer (N,N′-bis(4-(6-((3-ethyloxetan-3-yl)methoxy)-hexyloxy)phenyl)-N,N′-bis(4-methoxyphenyl)biphenyl-4,4′-diamin (QUPD)), and a green emissive layer (TSG-M) on top of each other. In order to compare the application techniques, the ink formulations have to be adapted to the respective process requirements. First, the influence of the application technique on the layer homogeneity of the different materials is investigated. Large area thickness measurements of the layers based on imaging color reflectometry (ICR) are used to compare the application techniques regarding the layer homogeneity and reproducible film thickness. The total stack thickness of all solution-processed layers of 32 OLEDs could be reproduced homogeneously in a process window of 30 nm for the technique combination of slot die coating and inkjet printing. The best efficiency of 13.3 cd A−1 is reached for a process combination of slot die coating and gravure printing. In order to enable a statistically significant evaluation, in total, 96 OLEDs were analyzed and the corresponding 288 layers were measured successively to determine the influence of layer homogeneity on device performance.

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“…Considerable line speeds are possible with R2R slot-die coating 32,33 as has been demonstrated for structurally similar organic photovoltaics 34 . Slot-die coating is capable of simple pattering of films, such as stripes of material [35][36][37] , generally formed using shims that control where ink can flow across the coated width or block coating where the coating is usually stopped and started intermittently 4,38,39 . These simple patterning methods can be useful for developing solar modules with interconnected devices.…”

Section: Introductionmentioning

confidence: 99%