MC 7: Quantum Dot and Color Conversion Technologies

The quest for high-efficiency, full-color micro-LED displays has driven significant interest in quantum dot (QD) materials. Color conversion of blue or UV light reduces the complexity of the micro-LED mass transfer process from three to only a single LED type. Red, green and (for UV also blue) pixels are generated through structured color conversion layers. Quantum dots offer high photoluminescence quantum yield (PLQY) and exceptional color purity, making them ideal for converting blue or UV light. This approach is especially promising for high-resolution displays with chip sizes below 20 µm, where the sidewall effect gets significant in green and red LED chips. This is due to a lower ratio between the LED surface area and the LED edges. In this masterclass, attendees will gain insight into advancements in QD materials, ink formulations, and printing technologies for color conversion of micro-LEDs. The session will cover the development of advanced core-shell QD materials, including those that are Cd-based and Cd-free, with enhanced stability and improved blue-light absorptivity for conversion to green and red light. We will present innovative approaches for embedding QD materials into printable matrix systems for improved optical density and processability. Attendees will also gain insight into tailor-made inks for high-resolution EHD-Jet printing below 10 µm pitch achieving beyond 1500 ppi display resolution.