2019
DOI: 10.1002/adom.201901429
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High‐Resolution Inkjet Printing of Quantum Dot Light‐Emitting Microdiode Arrays

Abstract: The direct printing of microscale quantum dot light‐emitting diodes (QLEDs) is a cost‐effective alternative to the placement of pre‐formed LEDs. The quality of printed QLEDs currently is limited by nonuniformities in droplet formation, wetting, and drying during inkjet printing. Here, optimal ink formulation which can suppress nonuniformities at the pixel and array levels is demonstrated. A solvent mixture is used to tune the ejected droplet size, ensure wetting, and provoke Marangoni flows that prevent coffee… Show more

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Cited by 179 publications
(132 citation statements)
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References 57 publications
(66 reference statements)
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“…[ 13 ] Alternately, inkjet printing is a versatility technology and compatible with large‐scale digital printing of customized patterns, which also has the potential advantage of reduction in material waste. [ 14–19 ] It is in principle a suitable technology for printing thin films for the above mentioned electrochemical devices with more features such as flexibility and high integration. However, the inkjet printing technology needs further amelioration to overcome some obstacles, such as nozzle clogging issues and development of stable inks to print devices effectively.…”
Section: Figurementioning
confidence: 99%
“…[ 13 ] Alternately, inkjet printing is a versatility technology and compatible with large‐scale digital printing of customized patterns, which also has the potential advantage of reduction in material waste. [ 14–19 ] It is in principle a suitable technology for printing thin films for the above mentioned electrochemical devices with more features such as flexibility and high integration. However, the inkjet printing technology needs further amelioration to overcome some obstacles, such as nozzle clogging issues and development of stable inks to print devices effectively.…”
Section: Figurementioning
confidence: 99%
“…The coffee ring effect is a crucial parameter to consider fabricating high resolution and uniform patterns. By manipulating the fraction of octane in the ink, the capillary flow and the inward Marangoni flow are balanced, which results in constant thickness across droplets [167]. In EHD printing, reducing nozzle size or novel designs of tips were reported to enhance printing quality [114,124].…”
Section: High-resolution Patterningmentioning
confidence: 99%
“…A low surface energy coating [163] Make pre-patterned structure on substrate (inkjet) [165,166] Reverse coffee-ring effect (inkjet) [97,167,168] Reduce nozzle size (EHD) [114,124] Introduce tip-assisted nozzle (EHD) [124] Manipulate focus ratio(aerosol) [131] Finer screen mask (screen printing) [70] Small engraved cells (gravure) [11,141] Make wettability contrast between cell and land(gravure) [147] Uniformity Uniform ink deposition is required to increase the electrical stability and reliability of the electronics.…”
Section: Remarks Strategies Referencesmentioning
confidence: 99%
“…[903] The lithography-based scaling capability has enabled the large-scale integration of silicon-based transistors into ICs for ubiquitous applications in our daily life. [919][920][921] Although printing techniques such as aerosol jet printing and inkjet printing have achieved significant progress in improving the printing resolution, [150,922] the printed structures still cannot reach the scale as small as those achievable with lithography techniques. The relatively low resolution (typically 10-100 μm) and large feature size (typically 100-200 μm) of the state-of-the-art AM printing techniques have limited the progress of all printed ICs.…”
Section: Logic Gates and Icsmentioning
confidence: 99%