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

Roh, Heebum; Ko, Donghyun; Shin, Dong Yeol; Chang, Jun; Hahm, Donghyo; Bae, Wan Ki; Lee, Changhee; Kim, Jun Young; Kwak, Jeonghun

doi:10.1002/adom.202002129

Cited by 56 publications

(44 citation statements)

References 48 publications

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“…Nanomaterial inkjet printing technology is a cutting-edge technology for the microdistribution and precise printing of ink droplets by controlling the nozzle voltage, air pressure, platform temperature, and motion trajectory, which can achieve the high-precision patterned deposition of nanomaterials. This technology has attracted extensive attention in the fields of display panel printing [1][2][3][4], microelectronic component fabrication [5][6][7], and flexible printing [8][9][10] in recent years due to the advantages of rapidity, convenience, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ink Properties on the Morphology of Long-Wave Infrared HgSe Quantum Dot Films

Wang¹,

Zhang²,

Wang³

et al. 2022

Nanomaterials

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As the core device of the miniature quantum dot (QD) spectrometer, the morphology control of the filter film array cannot be ignored. We eliminated strong interference from additives on the spectrum of a long-wave infrared (LWIR) QD filter film by selecting volatile additives. This work is significant for detecting targets by spectroscopic methods. In this work, a filter film with characteristic spectral bands located in the LWIR was obtained by the natural evaporation of QD ink, which was prepared by mixing various volatile organic solvents with HgSe QD–toluene solution. The factors affecting the morphology of HgSe LWIR films, including ink surface tension, particle size, and solute volume fraction, were the main focus of the analysis. The experimental results suggested that the film slipped in the evaporation process, and the multilayer annular deposition formed when the surface tension of the ink was no more than 24.86 mN/m. The “coffee ring” and the multilayer annular deposition essentially disappeared when the solute particles were larger than 188.11 nm. QDs in the film were accumulated, and a “gully” morphology appeared when the solute volume fraction was greater than 0.1. In addition, both the increase rate of the film height and the decrease rate of the transmission slowed down. The relationship between film height and transmission was obtained by fitting, and the curve conformed to the Lambert–Beer law. Therefore, a uniform and flat film without “coffee rings” can be prepared by adjusting the surface tension, particle size, and volume fraction. This method could provide an empirical method for the preparation of LWIR QD filter film arrays.

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Section: Introductionmentioning

confidence: 99%

Influence of Ink Properties on the Morphology of Long-Wave Infrared HgSe Quantum Dot Films

Wang¹,

Zhang²,

Wang³

et al. 2022

Nanomaterials

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“…(11)(12)(13)(14) The patterned QLED based on patterned ETL with good performance and stability is rarely reported. (15,16) On the other hand, the all solution patterning technique like ink-jet printing, photolithography, etc. is still in development.…”

Section: Introductionmentioning

confidence: 99%

P‐6.9: Patterning of Quantum Dots Light‐emitting Diodes Based on IGZO Films

Jia

et al. 2021

Symp Digest of Tech Papers

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Patterned quantum dots light‐emitting diodes (QLED) with sputtered IGZO films as electron transport layers are fabricated. The pattered IGZO films can define pixels ~10 μm, while accompanied by the nonuniform current spreading effect. The localized current density distribution observed by luminance distribution during the aging degrades the device seriously. In order to overcome this issue, the patterned SiO2 layer as the bank is introduced. This work also shows a potential way to tune the out couple efficiency and micro‐cavity effect (optical length) in QLED by charge transport layer thickness.

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“…Quantum dots (QDs), owing to their tunable bandgaps, high emission purity, and high fluorescent quantum yield, have been widely utilized in various light-emitting applications, including light-emitting diodes, lasers, displays, and anticounterfeiting labels. − In addition, the excellent solution-processing capability of quantum dots is compatible with low-cost micro/nano fabrication technologies for patterning and pixelated applications. , Inkjet printing, one of the most universal and promising noncontact solution-processing digital patterning technologies, has been widely adopted in various applications including microwave metadevices, millimeter-wave modulators, superconducting arrays, micro-supercapacitors, photodetectors, , solar cells, anticounterfeiting labels, and display. ,,, Compared to the traditional vacuum-depositing technique or solution-processing method such as spin coating, inkjet printing is susceptible to coffee-ring patterns and inhomogeneous films, limiting its cutting-edge and high-performance applications. , The evaporation and its accompanying hydrodynamics of microscale droplets are crucial for the eventual morphology of the inkjet-printed film . Currently, the effects of solvent composition, additives, particle interaction, and substrate modification on droplet evaporation and flow kinetics have been studied to achieve stable inks and desired films. − However, most of these works are confined to two-dimensional flat substrates. The corresponding process in substrates with a physically confined microscale space has been still unexplored.…”

mentioning

confidence: 99%

Quantum Dot Self-Assembly Deposition in Physically Confined Microscale Space by Using an Inkjet Printing Technique

Liu

Zhu

et al. 2021

J. Phys. Chem. Lett.

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Inkjet printing technique is susceptible to form coffer-ring patterns and inhomogeneous films owing to the evaporation and its accompanying hydrodynamics of microscale quantum dot droplet. Pioneer efforts are usually confined to two-dimensional flat substrates and inks with mixed solvents/additives. Herein we demonstrate that physically confined space offers an additional parameter in tailoring such processes of droplets and the following quantum-dot self-assembly deposition, without extra modification of quantum dots or solvent chemistry. Owing to the boundary of physically confined space, two three-phase border lines in both the bottom center (horizontal direction) and the barrier of the bank substrate (vertical direction) arise, inducing dual capillary flows and Marangoni backflows. The evaporation, fluid flow, and film-forming process in physically confined space are studied by introducing well-prepared single-solvent quantum dots inks. The systematical analysis offers valuable instructions including ink preparation, surface modification, and postprocessing evaporation technique for inkjet-printed patterning applications, especially for pixelated display, polychrome patterning, and sensor array.

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

Cited by 56 publications

References 48 publications

Influence of Ink Properties on the Morphology of Long-Wave Infrared HgSe Quantum Dot Films

Influence of Ink Properties on the Morphology of Long-Wave Infrared HgSe Quantum Dot Films

P‐6.9: Patterning of Quantum Dots Light‐emitting Diodes Based on IGZO Films

Quantum Dot Self-Assembly Deposition in Physically Confined Microscale Space by Using an Inkjet Printing Technique

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