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High-Resolution Pixelated Light Emitting Diodes Based on Electrohydrodynamic Printing and Coffee-Ring-Free Quantum Dot Film

10.1002@admt.202000401.pdf

Inkjet printing for preparing quantum dot light emitting diodes (QLEDs)
has become increasingly attractive due to its large-area, low-cost fabrication
features. However, the rather low resolution and coarse morphology induced
by the printing and uneven evaporation of droplet restrict its further development.
Herein, electrohydrodynamic (EHD) printing and mixed solvent
method are employed to fabricate high-resolution pixelated QLEDs. By
optimizing the mixed solvent ratio to weaken capillary flow, coffee-ring-free
quantum dot (QD) films can be obtained. With the help of EHD printing
process optimization and pixel defining layers introduction, high-resolution
pixelated QLED with 306 pixels per in. is achieved, which can meet the
requirements of manufacturing mobile phones. Finally, an inverted pixelated
QLED with a low turn-on voltage of 3 V and a maximum luminance
of 8533 cd m−2 is fabricated, demonstrating that the presented strategy has
huge potential in high-resolution and high-quality QD display manufacturing.


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