Inkjet printing technology has been vigorously pursued for the next generation displays. Compared to the currently used vacuum evaporation processes, inkjet printing methods have the desirable capability of precision deposits of functional materials. And it allows the procedures to be operated under atmospheric instead of high vacuum conditions. Therefore, it can increase yields and lower cost. However, as an emerging technology, it encounters its own difficulties.

Colloidal quantum dots light emitting diodes (QLEDs) born to be solution processed, together with their saturated and tunable emission properties are perfectly suitable for IJP mass production. Although, efficiency (over 20% EQE) and lifetime (over 2,000,000 hours half lifetime) of QLEDs has been tremendously improved, but all of them so far were based on spin coat process, which is unfortunately not suitable for display manufacturing. Even worse, due to the different mechanisms governing the two processes, the results from IJP cannot be reproduced even closely from spin coating. Thus, QLEDs data obtained from IJP processing that meets the industrial requirement is practically meaningful. In this research, we addressed low performance issues of IJP QLEDs and demonstrated that IJP QLED can reach the same level of operation lifetime and efficiency with their spin coating counterparts, making this technology truly towards the commercial applications.


High Efficiency and Stability of Ink-Jet Printed Quantum Dot Light Emitting Diodes

Division / Sponsors: 
Electronic & Photonic Packaging Division (EPPD)

Paper Proceedings: https://asmedigitalcollection.asme.org/InterPACK/InterPACK2020/volume/84041

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