47‐1: Invited Paper: Electrohydrodynamic Inkjet Specialized Perovskite non‐polar Ink for Printing Color Conversion Layer of Micro‐LED Display

In micro‐LED display, electrohydrodynamic (EHD) inkjet printing has been proven competent in patterning the fluorescent quantum dots in to color conversion arrays with the highest spatial resolution, compared with other inkjet printing technologies. In this article, we introduce basic thoughts of de...

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Bibliographic Details
Published in:SID International Symposium Digest of technical papers 2024-04, Vol.55 (S1), p.425-428
Main Authors: Lin, Yue, Yang, Xiao, Wang, Shuli, Chen, Zhong
Format: Article
Language:English
Subjects:
Color
Color conversion layer
Electrodynamics
Electrohydrodynamic inkjet printing
Electrohydrodynamics
Fluorescence
Homogeneity
Inkjet printing
Inks
Lead halide perovskite quantum dots
Light emitting diodes
Micro-LED display
Perovskites
Quantum dots
Rheological properties
Spatial resolution
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Summary:In micro‐LED display, electrohydrodynamic (EHD) inkjet printing has been proven competent in patterning the fluorescent quantum dots in to color conversion arrays with the highest spatial resolution, compared with other inkjet printing technologies. In this article, we introduce basic thoughts of designing the EHD specialized inks, aiming to optimized the properties of ink for commercially readily products. First, from the view point of electrodynamics, the basic mechanism of electrical driving is introduced, in which the difference between two type of ink, the ionic polar ink and the colloidal nonpolar ink are compared. Secondly, the interconnections and the physical problem between ink engineering and the optimization targets: ejection control, pixel homogeneity, stability and efficiency are revealed. The correlation between dielectric constant and viscosity are described in theory. It is pointed out that this coupling between electric and rheologic properties need to be taken into consideration when designing the EHD specialized ink.
ISSN:0097-966X
2168-0159
DOI:10.1002/sdtp.17100