Challenges in development of photostable Cd-free quantum dot based color convertors for microLED applications

Quantum Dots (QDs) with it's high photoluminescent quantum yield and absorption cross section have been established as a material of choice for color conversion applications. For a long time the industrial use of QDs has been restricted to a remote phosphor approach in liquid-crystal displays due to poor photothermal stability. While a lot of progress has been obtained for Cd-based QDs, the Cd-free alternatives are lagging behind. At QustomDot we have made a lot of progress towards obtaining photostable Cd-free QDs, currently surviving high blue light fluxes of 0,5-1,5 W/cm². We are presenting an overview of major challenges in developing QDs for microLED applications and main factors impacting the degradation mechanism of QDs under blue light illumination.