P‐71: Inkjet‐Printed Quantum Dots Photoresist Light Converting Layer and Photolithography Pixel Patterning for Micro‐Displays

Abstract

Quantum dots (QDs) can be employed as color conversion layers (CCLs) in LCDs or LEDs displays due to their excellent optical properties. In this work, we prepared the red quantum dots photoresist (QD‐PR) ink for fabricating the CCLs for micro‐LED displays through photo‐patterning process. Conventional photolithography process usually wastes up to 90% of materials applied while the spin‐coating process. In order to reduce the materials loss, we introduced inkjet‐printing (IJP) technique to fabricate the QDs CCLs, which allows drop‐on‐demand (DOD) material deposition. The CCLs prepared by IJP and further patterned by photolithography is demonstrated, with the pattern line width of 25 μm and the light conversion efficiency (LCE) of 41.37% at the thickness of 2 μm. The use of IJP technology for fabricating films resulted in an average material saving of 89.5% compared to the spin‐coated method.