High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes

Kim, Bong Hoon; Önses, M. Serdar; Lim, Jongwoo; Nam, Sooji; Oh, Nuri; Kim, Hojun; Yu, Ki Jun; Lee, Jung Woo; Kim, Jaehwan; Kang, Seung Kyun; Lee, Chi Hwan; Lee, Jungyup; Shin, Jae Ho; Kim, Nam Heon; Leal, Cecília; Shim, Moonsub; Rogers, John A.

doi:10.1021/nl503779e

Cited by 389 publications

(301 citation statements)

References 56 publications

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“…4g, h). 104 E-jet printing uses the electric field to eject the QD ink with a narrow width, and the resulting QD pattern shows uniform line thicknesses. Using this printing method, red and green QD pixels are formed with a resolution up to that of the commercial display.…”

Section: Patterning Technology Of Qds For Full-color Displaysmentioning

confidence: 99%

Flexible quantum dot light-emitting diodes for next-generation displays

et al. 2018

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In the future electronics, all device components will be connected wirelessly to displays that serve as information input and/or output ports. There is a growing demand of flexible and wearable displays, therefore, for information input/output of the nextgeneration consumer electronics. Among many kinds of light-emitting devices for these next-generation displays, quantum dot light-emitting diodes (QLEDs) exhibit unique advantages, such as wide color gamut, high color purity, high brightness with low turn-on voltage, and ultrathin form factor. Here, we review the recent progress on flexible QLEDs for the next-generation displays. First, the recent technological advances in device structure engineering, quantum-dot synthesis, and high-resolution full-color patterning are summarized. Then, the various device applications based on cutting-edge quantum dot technologies are described, including flexible white QLEDs, wearable QLEDs, and flexible transparent QLEDs. Finally, we showcase the integration of flexible QLEDs with wearable sensors, micro-controllers, and wireless communication units for the next-generation wearable electronics.

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Section: Patterning Technology Of Qds For Full-color Displaysmentioning

confidence: 99%

Flexible quantum dot light-emitting diodes for next-generation displays

et al. 2018

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“…Optical microscope imaging indicates that the lines are *35 microns in width. Recent studies have also shown that e-jet printing can be used to pattern QDs for LEDs (Kim et al 2015). …”

Section: Printingmentioning

confidence: 99%

Structural and optical characterization of CuInS2 quantum dots synthesized by microwave-assisted continuous flow methods

et al. 2015

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Semiconductor quantum dots (QDs) have recently been incorporated into consumer displays and lighting technologies. Now that these materials are being produced on industrial scales, it is important to investigate scalable synthetic methods and less toxic materials and chemistries. To achieve these goals, we have synthesized cadmium-free, visible light-emitting QDs using a microwave-assisted continuous flow reactor. After synthesis, the CuInS 2 QD cores underwent a near-complete Zn cation exchange reaction in a batch reactor, followed by the growth of a ZnS shell. Analysis of X-ray diffraction, transmission electron microscopy, and Raman spectroscopy data indicate that the crystal structure changes from CuInS 2 (chalcopyrite) to ZnS (zincblende) during the cation exchange reaction. Compositional analysis indicated that the core/shell QDs were *98 % ZnS, with Cu and In present at much lower concentrations. The photoluminescence (PL) peak position was blue shifted for longer cation exchange reactions, and it was found that the ZnS shell was necessary for improved PL stability.The synthesized QDs have a PL down conversion efficiency of *65 % when using a blue LED source.

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“…In the case of a strain sensor, when wireless transmission functions, including power and data transfer, are not incorporated, a hard wire connection is required with an external measuring device, which degrades the durability of the device and significantly limits the user's activity when worn. Recent work demonstrates various wireless chemical and biological sensor systems with Bluetooth 23,24 and near-field-communication (NFC) [25][26][27] capabilities, the latter of which can also be operated in a battery-free mode via power harvesting. However, previously reported liquid metal-based antennas tend to be unsuitable for skin-attachable applications in terms of size or thickness, mostly because of limitations in the injection method.…”

Section: Introductionmentioning

confidence: 99%

A skin-attachable, stretchable integrated system based on liquid GaInSn for wireless human motion monitoring with multi-site sensing capabilities

et al. 2017

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This paper introduces a liquid-metal integrated system that combines soft electronics materials and engineering designs with advanced near-field-communication (NFC) functionality for human motion sensing. All of the active components, that is, strain sensor, antenna and interconnections, in this device are made of liquid metal, and the device has unique gel-like characteristics and stretchability. Patterning procedures based on selective wetting properties of the reduced GaInSn enable a skin-attachable, miniaturized layout, in which the diameter of the device is less than 2 cm. Electromechanical characterization of the strain sensor and antenna reveals their behaviors under large uniaxial tensile and compressive strains, as well as more complex modes of deformation. Demonstrations of these devices involve their use in monitoring various human motions in a purely wireless fashion; examples include wrist flexion, movements of the vocal cord and finger motion. This simple platform has potential for use in human-machine interfaces for prosthetic control and other applications. NPG Asia Materials (2017) 9, e443; doi:10.1038/am.2017.189; published online 27 October 2017 INTRODUCTION Skin-mounted, deformable devices capable of sensing various signals such as strain, pressure and temperature can be used in a variety of applications ranging from health monitoring systems and personal diagnostics to human-machine interfaces. 1 Advanced concepts in stretchable materials and mechanics principles form the basis for devices that can gently laminate onto the soft and curvilinear surfaces of human skin or conformally wrap onto internal organs of the body. 2-5 Gallium-based liquid metals are highly suitable candidates for such applications due to their unlimited deformability while maintaining excellent metallic conductivity. The use of gallium-based liquid-metal alloys confined in elastomeric enclosures provides intrinsically stretchable properties that maintain bulk electrical conductivity with high stretchability. 6 Additionally, unlike mercury, gallium is safe to use in ambient environment due to its low vapor pressure. 7,8 By taking full advantage of the deformability and nontoxicity of the liquid metal, many research groups have utilized liquid metal for wearable

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High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes

Cited by 389 publications

References 56 publications

Flexible quantum dot light-emitting diodes for next-generation displays

Flexible quantum dot light-emitting diodes for next-generation displays

Structural and optical characterization of CuInS2 quantum dots synthesized by microwave-assisted continuous flow methods

A skin-attachable, stretchable integrated system based on liquid GaInSn for wireless human motion monitoring with multi-site sensing capabilities

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