A Systematic Approach to Tune the Rheological Behavior of Perovskite Quantum Dot Inks for Inkjet Printing Applications

Le résumé fourni par la source

Modern displays utilize color conversion layers to convert blue backlight into colored sub-pixels. Perovskite quantum dots (PQDs) are a very efficient material for this conversion and are currently applied as one continuous film combined with a color filter layer. Inkjet printing could enable the application of PQDs directly into colored sub-pixels, eliminating the filter layer and improving efficiency of the display by design. In this work, PQDs were modified for application by inkjet. UV-curable resin and PQD dispersion were modified to reduce viscoelasticity down into inkjetable range, which was characterized using the TriPAV high frequency rheometer. Printability of PQDs was further shown by dropwatching and manufacturing an inkjet-printed pixel-array demonstrator. The highly loaded ink is UV-curable and solvent-free. It can be applied by inkjet into precise sub-pixel arrays with a pixel thickness of 10µm in one pass. At that thickness, color conversion efficiency and optical density of the PQD sub-pixels fulfill specifications needed for application in modern displays.

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