Fluidic self-assembly for MicroLED displays by controlled viscosity

Lee, D.; Cho, Seongkyu; Park, Cheolheon; Park, Kyung Ryoul; Lee, Jongcheon; Nam, Jaewook; Ahn, Kwangguk; Park, C.S.; Jeon, Kiseong; Yuh, Hwan-Kuk; Choi, Wonseok; Lim, Chung Hyun; Kwon, Tae-Kyu; Min, Young Hwan; Joo, Minho; Choi, Yoon-Ho; Lee, Jeong Soo; Kim, Changsoon; Kwon, Sunghoon

doi:10.1038/s41586-023-06167-5

Cited by 13 publications

(2 citation statements)

References 34 publications

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“…Micro-LED − displays are gaining momentum in the display community as a promising display technology due to their potential applications, − which include flexible wearable electronic display devices, augmented reality/virtual reality (AR/VR), miniature projectors, and ultrahigh-definition televisions . Semiconductor quantum dot fluorescent nanomaterials − can be used as color conversion layers (CCLs) for full-color micro-LED displays for the purpose of converting the monochromatic light from the background micro-LED chip arrays to primary colors .…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic Inkjet Printing of Three-Dimensional Perovskite Nanocrystal Arrays for Full-Color Micro-LED Displays

Chen,

Yang,

Fan

et al. 2024

ACS Appl. Mater. Interfaces

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Perovskite nanocrystal (PeNC) arrays are showing a promising future in the next generation of micro-light-emitting-diode (micro-LED) displays due to the narrow emission linewidth and adjustable peak wavelength. Electrohydrodynamic (EHD) inkjet printing, with merits of high resolution, uniformity, versatility, and cost-effectiveness, is among the competent candidates for constructing PeNC arrays. However, the fabrication of red light-emitting CsPbBr x I (3−x) nanocrystal arrays for micro-LED displays still faces challenges, such as low brightness and poor stability. This work proposes a design for a red PeNC colloidal ink that is specialized for the EHD inkjet printing of three-dimensional PeNC arrays with enhanced luminescence and stability as well as being adaptable to both rigid and flexible substrates. Made of a mixture of PeNCs, polymer polystyrene (PS), and a nonpolar xylene solvent, the PeNC colloidal ink enables precise control of array sizes and shapes, which facilitates on-demand micropillar construction. Additionally, the inclusion of PS significantly increases the brightness and environmental stability. By adopting this ink, the EHD printer successfully fabricated full-color 3D PeNC arrays with a spatial resolution over 2500 ppi. It shows the potential of the EHD inkjet printing strategy for high-resolution and robust PeNC color conversion layers for micro-LED displays.

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Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic Inkjet Printing of Three-Dimensional Perovskite Nanocrystal Arrays for Full-Color Micro-LED Displays

Chen,

Yang,

Fan

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…As the next generation display technology, the micro light emitting diode (micro-LED) offers a series of significant advantages, such as low energy consumption, high brightness, high durability, and fast response time. However, it is difficult to mechanically transfer red, green, and blue (RGB) three primary colored micro-LED chips on a same substrate at a sufficiently high yield for full-color display .…”

mentioning

confidence: 99%

Dual-Ligand Red Perovskite Ink for Electrohydrodynamic Printing Color Conversion Arrays over 2540 dpi in Near-Eye Micro-LED Display

Yang,

Wang,

Hou

et al. 2024

Nano Lett.

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The lack of stability of red perovskite nanocrystals (PeNCs) remains the main problem that restricts their patterning application. In this work, the dual-ligand passivation strategy was introduced to stabilize PeNCs and inhibit their halogen ion migration during high-voltage electrohydrodynamic (EHD) inkjet printing. The as-printed red arrays exhibit the highest emisson intensity and least blue shift compared with samples with other passivation strategies under a high electric field during EHD inkjet printing. Combining with blue and green PeNC inks, single-color and tricolor color conversion layer arrays were successfully printed, with minimum pixel size of 5 μm and the highest spatial resolution of 2540 dpi. The color coordinate of CsPbBrI 2 NCs arrays are located close to the red point, with a color gumat of 97.28% of Rec. 2020 standard. All of these show great potential in the application of color conversion layers in a near-eye micro-LED display.

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Bioinspired Plateau–Rayleigh Instability on Fibers: From Droplets Manipulation to Continuous Liquid Films

Li,

Shi,

et al. 2024

Adv Funct Materials

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The Plateau–Rayleigh instability (PRI) of a liquid column, which always spontaneously breaks into droplets to minimize surface energy, underlies a variety of fascinating phenomena in daily life and industrial applications. Different from the free liquid column, the evolution of the liquid film on a fiber involves solid‐liquid interfaces which allow for regulating the PRI. Recently, natural fibers with certain topologies have witnessed various dynamic liquid behaviors from droplet manipulation to continuous liquid films. Tailoring the topology of local curved liquid film by the structural‐confinement is the key to manipulating liquids, where the asymmetric Laplace pressure generated by the asymmetric/non‐spherical liquid film promotes the liquid motion. In nature, the spider silk collects droplets efficiently by the spindle‐knot structure; while the mulberry silk enables a smooth surface‐coating on dual‐parallel fibers. Drawing inspirations, many artificial structured fibers are developed to precisely regulate liquid behaviors in the form of either separated droplets or continuous liquid films, which have demonstrated applications as fluidic coating, micro‐patterning, and materials fabrication. Here, recent research progress on bioinspired fibrous PRI from the viewpoints of tailoring the Laplace pressure by rationally designing the surface topology, which offers inspiration for liquid manipulation using open fibrous media, is reviewed.

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Fluidic self-assembly for MicroLED displays by controlled viscosity

Cited by 13 publications

References 34 publications

Electrohydrodynamic Inkjet Printing of Three-Dimensional Perovskite Nanocrystal Arrays for Full-Color Micro-LED Displays

Electrohydrodynamic Inkjet Printing of Three-Dimensional Perovskite Nanocrystal Arrays for Full-Color Micro-LED Displays

Dual-Ligand Red Perovskite Ink for Electrohydrodynamic Printing Color Conversion Arrays over 2540 dpi in Near-Eye Micro-LED Display

Bioinspired Plateau–Rayleigh Instability on Fibers: From Droplets Manipulation to Continuous Liquid Films

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