Air stable eco-friendly quantum dots with a light-mediated photoinitiator for an inkjet printed flexible light emitting diode

Lee, Hanleem; Suh, Yo‐Han; Fan, Xiang‐Bing; Ni, Limeng; Yang, Jingzhou; Kim, Yoonwoo; Jo, Jeong‐Wan; Choi, Hyung Woo; Jung, Sung‐Min; Shin, Dongwook; Lee, Sanghyo; Kim, Jong Min

doi:10.1039/d2tc00851c

Cited by 14 publications

(8 citation statements)

References 60 publications

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“…To date, various solution processes have been developed for preparation of QD patterned arrays, such as inkjet printing, − film lithography, − transfer printing, − blade coating with a mask, , Chinese brush, fiber array printing, electrodeposition, Langmuir–Blodgett (LB) printing, electrospinning, hydrophilic mask, and others . These methods, however, still have some drawbacks that need to be addressed, such as complex instruments, high costs, single patterns, and low resolution.…”

Section: Introductionmentioning

confidence: 99%

CdSe/ZnS Quantum Dot Patterned Arrays for Full-Color Light-Emitting Diodes in Active-Matrix QLED Display

Li,

Sun,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Quantum dot light-emitting diodes (QLEDs) are increasingly being recognized as next-generation display technology, owing to their wide color gamut, high saturation levels, and low energy consumption. However, the primary challenge in QLED display fabrication lies in precisely depositing these inorganic quantum dot (QD) nanoparticles over a large area multiple times. Nowadays, solution processes such as inkjet printing and screen printing have been employed to address these challenges; however, they still have some trade-offs between multicolor deposition, precise spatial arrangement, and equipment cost. Here, the precise assembly of multiple QD patterned arrays on one target substrate was achieved using an asymmetric wettability interface assembly (AWIA) template, resulting in a high-pixel resolution and full-color QLED device. The asymmetric wettability interface between the top and bottom of the silicon pillar on the template allows for precise splitting and pinning of a continuous liquid film, facilitating further assembly of QD pattern arrays. Additionally, the multicolor and multishape QD pattern array was created through QD surface modification (orthogonal solvent protection) and dislocation pinning processes (reducing dissolution time) during the repetition process. Consequently, high-resolution (each pixel ≈ 10 μm; PPI ≈ 1278) full-color (yellow, cyan, violet, and white) QLED devices were fabricated efficiently. This approach offers a perspective for assembling multiple micropatterned arrays for high-resolution electronic devices.

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Section: Introductionmentioning

confidence: 99%

CdSe/ZnS Quantum Dot Patterned Arrays for Full-Color Light-Emitting Diodes in Active-Matrix QLED Display

Li,

Sun,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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“…1–7 It has the advantages of no contact with the substrate, material saving, pixelated processing and high efficiency in industrial production. 8–10 To achieve pixelated processing, the substrate of OLED devices usually needs to be patterned. 6,11,12 However, the drying process and the film profile of printed inks in the bank are more likely to be affected by coffee-ring patterns and inhomogeneous films.…”

Section: Introductionmentioning

confidence: 99%

Improving the uniformity of the inkjet-printed polymer film in a bank by Marangoni flow and contact line sliding

Liu,

Lv,

et al. 2024

J. Mater. Chem. C

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“…Controlling the three-phase contact line and the drying rate at the periphery and apex of the droplet pose challenges to achieving a flat pattern after ink deposition, known as the CRE [21]. It can be alleviated by the Marangoni effect (ME) [22], UV curing with the addition of the photoinitiator (PI) [23], electrowetting (EW) [24], and engineering the substrate surface [25,26].…”

Section: Introductionmentioning

confidence: 99%

Inkjet printing of heavy-metal-free quantum dots-based devices: a review

Fu,

Critchley

2024

Nanotechnology

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Inkjet printing (IJP) has become a versatile, cost-effective technology for fabricating organic and hybrid electronic devices. Heavy-metal-based quantum dots (HM QDs) play a significant role in these inkjet-printed devices due to their excellent optoelectrical properties. Despite their utility, the intrinsic toxicity of HM QDs limits their applications in commercial products. To address this limitation, developing alternative HM-free quantum dots (HMF QDs) that have equivalent optoelectronic properties to HM QD is a promising approach to reduce toxicity and environmental impact. This article comprehensively reviews HMF QD-based devices fabricated using IJP methods. The discussion includes the basics of IJP technology, the formulation of printable HMF QD inks, and solutions to the coffee ring effect (CRE). Additionally, this review briefly explores the performance of typical state-of-the-art HMF QDs and cutting-edge characterization techniques for QD inks and printed QD films. The performance of printed devices based on HMF QDs is discussed and compared with those fabricated by other techniques. In the conclusion, the persisting challenges are identified, and perspectives on potential avenues for further progress in this rapidly developing research field are provided.

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Air stable eco-friendly quantum dots with a light-mediated photoinitiator for an inkjet printed flexible light emitting diode

Abstract: Printed quantum dot (QD) light emitting diodes (QLEDs) over large scale have received much interest in the last decade owing to the demand for the next generation of self-emissive large-area...

Cited by 14 publications

References 60 publications

CdSe/ZnS Quantum Dot Patterned Arrays for Full-Color Light-Emitting Diodes in Active-Matrix QLED Display

CdSe/ZnS Quantum Dot Patterned Arrays for Full-Color Light-Emitting Diodes in Active-Matrix QLED Display

Improving the uniformity of the inkjet-printed polymer film in a bank by Marangoni flow and contact line sliding

Inkjet printing of heavy-metal-free quantum dots-based devices: a review

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