To inhibit coffee ring effect in inkjet printing of light-emitting polymer films by decreasing capillary force

Yu, Xinge; Xing, Rubo; Peng, Zhongxiang; Lin, Yangming; Du, Zhonghui; Ding, Junqiao; Wang, Lixiang; Han, Yanchun

doi:10.1016/j.cclet.2018.09.007

Cited by 55 publications

(37 citation statements)

References 29 publications

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“…These mechanisms are highly affected by the behavior of molecules at the gas-liquid interface. Further, the evaporation rate and viscosity control by solvent engineering has been implemented to counteract these phenomena that are deteriorative to the device performance and layer uniformity [9].…”

Section: Table 1 Normalized Remaining Thickness Of M5 In Solvent Resistance Test Of Solvent Composition A-bmentioning

confidence: 99%

22‐2: Enhanced Orthogonality of Inkjet‐Printed OLEDs’ Emitting Layer by Novel Ink Composition for Electron Transport Layer

Kang

Kim

Mun

et al. 2021

Symp Digest of Tech Papers

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Section: Table 1 Normalized Remaining Thickness Of M5 In Solvent Resistance Test Of Solvent Composition A-bmentioning

confidence: 99%

22‐2: Enhanced Orthogonality of Inkjet‐Printed OLEDs’ Emitting Layer by Novel Ink Composition for Electron Transport Layer

Kang

Kim

Mun

et al. 2021

Symp Digest of Tech Papers

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“…65,66 This results in the net capillary flow of the solution towards the edges which causes a pileup of crystals along the perimeter of the film. 67 The coffee ring stain effect can be inhibited by controlling the viscosity of the solvent, the temperature of the substrate, [68][69][70][71] and the drying speed. Among many samples and many spin-coatings, some of the deposited perovskite microarrays do not have a good pattern.…”

Section: Preparation and Characterization Of Perovskite Thin-film Microarraysmentioning

confidence: 99%

Reusable Chemically-Micropatterned Substrates via Sequential Photoinitiated Thiol-Ene Reactions as Template for Perovskite Thin-Film Microarrays

Piecco¹,

Vicente²,

Pyle³

et al. 2019

Preprint

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<p>Patterning semiconducting materials are important for many applications such as microelectronics, displays, and photodetectors. Lead halide perovskites are an emerging class of semiconducting materials that can be patterned via solution-based methods. Here we report an all-benchtop patterning strategy by first generating a patterned surface with contrasting wettabilities to organic solvents that have been used in the perovskite precursor solution then spin-coating the solution onto the patterned surface. The precursor solution only stays in the area with higher affinity (wettability). We applied sequential sunlight-initiated thiol-ene reactions to functionalize (and pattern) both glass and conductive fluorine-doped tin oxide (FTO) transparent glass surfaces. The functionalized surfaces were measured with the solvent contact angles of water and different organic solvents and were further characterized by XPS, selective fluorescence staining, and selective DNA adsorption. By simply spin-coating and baking the perovskite precursor solution on the patterned substrates, we obtained perovskite thin-film microarrays. The spin-coated perovskite arrays were characterized by XRD, AFM, and SEM. We concluded that Patterned substrate prepared via sequential sunlight-initiated thiol-ene click reactions is suitable to fabricate perovskite arrays via the benchtop process. In addition, the same patterned substrates can be reused several times until a favorable perovskite microarray is acquired. Among a few conditions we have tested, DMSO solvent and modified FTO surfaces with alternatively carboxylic acid and alkane is the best combination to obtain high-quality perovskite microarrays. The solvent contact angle of DMSO on carboxylic acid-modified FTO surface is nearly zero and 65±3<sup>o</sup> on octadecane modified FTO surface.</p>

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“…[ 18–26 ] Moreover, the depositing morphologies of the inkjet droplets affect the efficiency, stability, and performance of the inkjet‐printed devices. In order to control this phenomenon, a widely used method in controlling the drying conditions of a droplet is employed using cosolvents, [ 11,19–26 ] mixing surfactants, [ 27–29 ] and/or fine‐tuning viscosity, [ 30–32 ] which optimized the Marangoni flow and capillary flow. For instance, Jiang et al.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Performance of Pixelated Quantum Dot Light‐Emitting Diodes by Inkjet Printing of Quantum Dot–Polymer Composites

Roh

Shin

et al. 2021

Advanced Optical Materials

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Inkjet printing of colloidal quantum dots (QDs) is considered a promising technology for application in full‐color quantum dot light‐emitting diode (QLED) displays. However, QLEDs that are inkjet printed in a pixel‐defining bank structure generally exhibit a low performance, mainly due to the nonuniformity in its QD morphology. In this study, an enhanced performance of inkjet‐printing‐based pixelated QLEDs is achieved by introducing small amounts of poly(methyl methacrylate) (PMMA) of different molecular weights into QD inks. When this QD–PMMA composite ink is adopted, uniform droplets are formed, originating from contact line depinning during drying. Inside the bank structure, the inkjet‐printed QD–PMMA composite film shows a smooth surface and little pileup at the bank edges. A pixelated QLED with PMMA with a molecular weight of 8 kDa exhibits the highest luminance of 73 360 cd m−2 and an external quantum efficiency of 2.8%, which are remarkably higher than that of the inkjet‐printed QLED subpixels without PMMA. The result is verified through the observation of the drying process and the QLED subpixel shapes under operation. Thus, inkjet‐printed QD–PMMA composite inks can be a promising strategy for future research on pixelated QLEDs for the fabrication process of full‐color QLED displays.

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To inhibit coffee ring effect in inkjet printing of light-emitting polymer films by decreasing capillary force

Cited by 55 publications

References 29 publications

22‐2: Enhanced Orthogonality of Inkjet‐Printed OLEDs’ Emitting Layer by Novel Ink Composition for Electron Transport Layer

22‐2: Enhanced Orthogonality of Inkjet‐Printed OLEDs’ Emitting Layer by Novel Ink Composition for Electron Transport Layer

Reusable Chemically-Micropatterned Substrates via Sequential Photoinitiated Thiol-Ene Reactions as Template for Perovskite Thin-Film Microarrays

Enhanced Performance of Pixelated Quantum Dot Light‐Emitting Diodes by Inkjet Printing of Quantum Dot–Polymer Composites

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