Cd-free Quantum Dot Colour Converters for MicroLED Applications

MicroLED technology is on its way to replacing traditional display technologies by bringing added value
propositions to the consumer market, including high brightness, excellent lifetime, high resolution,
and superior efficiency, with applications spanning from wearable devices, augmented/virtual reality,
and ultrahigh-definition TVs.
To date, challenges in scaling pick-and-place processes and producing highly efficient red and green
native microLEDs hamper microLED mass production. A quantum dot (QD) color conversion strategy
to produce an RGB display from an array of blue microLEDs is an elegant way to simplify the
manufacturing process and to overcome several technological challenges in the mass-transfer
process, the display brightness, and the driving electronics. QustomDot’s mission is to bring
unmatched colors to micro-LED devices through QD color conversion layers to overcome the
challenges above and facilitate market entry of miroLED-based devices.
Over the past few years, QustomDot has made a giant leap towards QD resins containing Cd-free
RoHS-compliant InP QDs. Our focus has been to formulate QD resins with ultra-high solid loading,
excellent shelf life, and processability, adapted for various processing methods, including
photolithography, nano-imprint lithography, and high-precision printing methods. In addition to
excellent processability, our QD resins result in QD films with high solid loading, excellent absorption
at the sub-10 µm thickness, and high conversion efficiency while matching, if not exceeding, the
reliability of commercially available InP-based QDs. Our talk will showcase our recent progress
towards optimization of our red and green QD resins to obtain color conversion films with optical
properties one step closer to fulfilling the challenging requirements of commercial microLED displays.