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High‐Resolution Inkjet Printing of Quantum Dot Light‐Emitting Microdiode Arrays
Author(s) -
Yang Peihua,
Zhang Long,
Kang Dong Jin,
Strahl Robert,
Kraus Tobias
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201901429
Subject(s) - materials science , inkwell , quantum dot , light emitting diode , optoelectronics , microscale chemistry , pixel , inkjet printing , luminance , wetting , diode , optics , composite material , mathematics education , mathematics , physics
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.