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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 stain rings. Arrays of green QLED devices are printed at a resolution of 500 pixels in.−1 with a maximum luminance of ≈3000 cd m−2 and a peak current efficiency of 2.8 cd A−1. The resulting array quality is sufficient to print displays at state-of-the-art resolutions.

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Document Type:Article
Author:Peihua Yang, Long Zhang, Dong Jin KangORCiD, Robert Strahl, Tobias KrausORCiD
Parent Title (English):Advanced Optical Materials
First Page:1901429
Year of first Publication:2020
Release Date:2022/09/15
Tag:high resolution; inkjet printing; light-emitting diodes; quantum dots; uniform pixel arrays
Impact:09.926 (2020)
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 660 Technische Chemie
Open Access:Open Access
Signature:INM 2020/013
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International